CN116354680A - High-crack-resistance high-corrosion-resistance marine concrete and preparation method thereof - Google Patents
High-crack-resistance high-corrosion-resistance marine concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 105
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000000463 material Substances 0.000 claims abstract description 83
- 239000004568 cement Substances 0.000 claims abstract description 74
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 49
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 37
- 239000011707 mineral Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 35
- 239000010881 fly ash Substances 0.000 claims abstract description 34
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 33
- 239000011230 binding agent Substances 0.000 claims abstract description 30
- 239000002135 nanosheet Substances 0.000 claims abstract description 30
- 238000005260 corrosion Methods 0.000 claims abstract description 27
- 230000007797 corrosion Effects 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 239000004575 stone Substances 0.000 claims description 43
- 239000011398 Portland cement Substances 0.000 claims description 23
- 239000004576 sand Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 229920002635 polyurethane Polymers 0.000 claims description 10
- 239000004814 polyurethane Substances 0.000 claims description 10
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000002250 absorbent Substances 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 5
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 4
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 4
- 229930006000 Sucrose Natural products 0.000 claims description 4
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 4
- 239000008103 glucose Substances 0.000 claims description 4
- 239000002064 nanoplatelet Substances 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 239000005720 sucrose Substances 0.000 claims description 4
- 238000009736 wetting Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 2
- -1 sulfur (iron) aluminate Chemical class 0.000 abstract description 20
- 239000011148 porous material Substances 0.000 abstract description 5
- 229920000247 superabsorbent polymer Polymers 0.000 description 25
- 230000036571 hydration Effects 0.000 description 19
- 238000006703 hydration reaction Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 14
- 238000012423 maintenance Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
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- 230000006872 improvement Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052791 calcium Inorganic materials 0.000 description 1
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- 238000007716 flux method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/024—Graphite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to a high-crack-resistance high-corrosion-resistance marine concrete and a preparation method thereof, wherein the marine concrete comprises the following raw materials in parts by weight: 220-260 parts of composite cement, 100-120 parts of fly ash, 60-80 parts of mineral powder, 700-800 parts of fine aggregate, 1000-1100 parts of coarse aggregate, 5-15 parts of modified internal curing material, 4.4-6.2 parts of water reducer, 1-2 parts of retarder and 140-160 parts of water; the modified internal curing material comprises an internal curing agent, graphene nano sheets and a binder. The graphene modified internal curing material is added, on the basis of reducing shrinkage cracks of concrete, graphene can play a role in supporting collapse pores of the internal curing agent on one hand, the strength performance of the concrete is improved, on the other hand, the heat conducting performance of the concrete can be greatly improved, the problem that early heat release of sulfur (iron) aluminate cement type marine concrete is concentrated is solved, the temperature difference inside and outside the concrete is reduced, and therefore temperature cracks are reduced, and finally the obtained marine concrete is strong in mechanical performance, crack resistance and corrosion resistance.
Description
Technical Field
The application relates to the technical field of building materials, in particular to high-crack-resistance high-corrosion-resistance marine concrete and a preparation method thereof.
Background
As a main material for marine facility construction, marine concrete is subjected to marine environmental corrosion in two main aspects: on one hand, the physical damage is realized, and sediment, slush and the like in the sea water have scouring action on the concrete structure along with sea waves; the concrete structure in the tidal splash zone is subjected to the alternate action of the dryness and the wetness of tidal water for a long time, so that salt is crystallized out to damage the concrete structure; freeze thawing damage of seawater to a concrete structure in winter, and the like.
On the other hand, the chemical attack caused by cracks of the concrete structure, cl - As an extremely strong anode activator, fe on the surface of the steel bar in the concrete can be destroyed 3 O 4 ·γFe 2 O 3 ·βH 2 O passivation film, forming primary cell, and causing steel bar corrosion; sulfate reacts with cement hydration products to form expansive products, resulting in structural failure of the concrete; the long term soaking action of seawater also causes Ca (OH) which is a relatively soluble component in cement hydration products 2 Thereby resulting in a situation where the compactness of the concrete structure is reduced and the internal alkalinity is lowered. The above corrosion causes tend to occur simultaneously and promote each other, and more stringent requirements are put on the corrosion resistance of the marine concrete structure.
The corrosion in concrete is mostly caused by cracks on the surface of the concrete, and the cracks on the surface of the concrete are generated by self-shrinkage, drying shrinkage, temperature stress and the like, wherein the number of cracks generated by shrinkage is more. The self-shrinkage and self-drying of the concrete can be obviously reduced by adding the internal curing material into the concrete, and the cracking resistance of the concrete is improved, because the internal curing material mainly plays a role of a reservoir in the concrete, and when the cement of the concrete added with the internal curing material is insufficient in hydration, a plurality of reservoirs in the concrete release water and further achieve the effect of in-situ curing. The most commonly used internal curing materials at present are super absorbent resins (SAP) proposed by Jensen, a denmark scholars in 2001, which not only can rapidly absorb liquid water with hundreds to thousands of times its own weight, but also can well store the liquid water in the polymer network in its three-dimensional network structure. Compared with other internal curing materials, the SAP has the characteristics of small doping amount, quick water absorption and large water absorption multiplying power. However, the SAP leaves voids in the concrete after water release, which are comparable to the original shape and size of SAP particles, and is difficult to be completely filled with cement hydration products, which seriously affects the mechanical properties of the concrete.
In addition, the cement component of the marine concrete commonly used in the current engineering is Portland cement or ordinary Portland cement, and it is difficult to meet the durability requirement. In the 70-80 s of the 20 th century, our country first invented a method using calcium sulfoaluminate
Sulphoaluminate cement as main mineral and +.>
Mineral and iron phase 6 CaO.Al 2 O 3 ·2Fe 2 O 3 (C 6 AF 2) The main mineral is aluminoferrite cement, and the two cements are collectively called as sulfur (iron) aluminate cement.
Hydration products of sulphoaluminate cement including ettringite (AFt) and hydrated calcium silicate (C-S-H), hydration products of aluminoferrite cement including AFt, C-S-H, ca (OH) 2 Iron colloid (FH) 3 ). The main component AFt of the hydration product of the sulfur (iron) aluminate cement enables the concrete prepared by the cement to have quick hardening early strength and excellent anti-permeability and anti-corrosion performance, and in additionFH in the hydration product of ferroaluminate cement 3 The existence of the (B) can lead the concrete prepared by the (B) to have seawater resistance and sulfate corrosion resistance. However, the application of the sulfur (iron) aluminate cement to the corrosion resistance enhancement of marine concrete has the following defects:
1. the hydration product of the sulfur (iron) aluminate cement is low-alkalinity hydrated calcium silicate C-S-H (I), so that the pH value of a hydrate liquid phase is lower and is only 11.5-12, and a passivation film cannot be formed on the surface of the steel bar in the marine concrete structure rapidly, so that the problem of corrosion of the steel bar can be caused in early stage; in addition, low alkalinity hydrated calcium silicate C-S-H (I) can also cause dusting of the concrete surface.
2. The setting and hardening of the sulfur (iron) aluminate cement are fast, the initial setting time is much faster than that of the common silicate cement, the initial setting time is generally between 30 and 50min, and the final setting time is between 40 and 90min, so that the sulfur (iron) aluminate cement is difficult to pump in actual construction, has small operable space, can only be prepared and used on site, and limits the popularization and application of the sulfur (iron) aluminate cement.
3. The hydration heat release of the sulfur (iron) aluminate cement is concentrated, the highest hydration heat release peak is about 8-12 h, and 70% -80% of the total hydration heat can be released within 1d, so that a great amount of generated hydration heat easily causes overlarge temperature difference between the center and the outer surface of the marine concrete, temperature stress is generated, and the marine concrete structure is caused to have temperature cracks, so that the service life of the marine concrete structure is influenced.
In view of this, how to improve the crack resistance and corrosion resistance of marine concrete has great significance for improving the service life of marine infrastructure.
Disclosure of Invention
The embodiment of the application provides high-crack-resistance high-corrosion-resistance marine concrete and a preparation method thereof, which are used for solving the problems that the durability of the marine concrete in the related technology is not up to the standard, the setting and hardening of sulfur (iron) aluminate cement are fast, and the temperature cracks and the marine concrete shrinkage cracks are caused by the temperature difference between the inside and the outside.
The technical scheme provided by the application is as follows:
in a first aspect, the application provides a high-crack-resistance high-corrosion-resistance marine concrete, which comprises the following raw materials in parts by mass:
220-260 parts of composite cement, 100-120 parts of fly ash, 60-80 parts of mineral powder, 700-800 parts of fine aggregate, 1000-1100 parts of coarse aggregate, 5-15 parts of modified internal curing material, 4.4-6.2 parts of water reducer, 1-2 parts of retarder and 140-160 parts of water;
the modified internal curing material comprises an internal curing agent, graphene nano sheets and a binder.
In some embodiments, the composite cement comprises Portland cement, and
sulphoaluminate cement or aluminoferrite cement.
In some embodiments, the modified inner curing material comprises, in mass percent:
45-50% of internal curing agent, 45-50% of graphene nano-sheets and 5-10% of adhesive;
wherein the internal curing agent comprises super absorbent resin;
the binder comprises a polyurethane binder.
In some embodiments, the polyurethane-based adhesive includes a glue, a viscosity modifier, and a curing agent.
In some embodiments, the graphene nanoplatelets have a radial dimension of 110-150 μm and a thickness of 10-20nm.
In some embodiments, the fine aggregate comprises river sand having a particle size of 0.1-0.6mm;
and/or the coarse aggregate comprises small stones with the continuous grading of 5-16mm and large stones with the continuous grading of 16-25 mm.
In some embodiments, the water reducing agent comprises a polycarboxylate water reducing agent;
and/or, the retarder comprises one of sucrose, glucose or citric acid.
In some embodiments, the fly ash is class II fly ash;
and/or the mineral powder is S95 grade mineral powder.
In a second aspect, the present application provides a method for preparing the marine concrete with high crack resistance and high corrosion resistance, which comprises the following steps:
pre-wetting an internal curing agent with water, mixing the internal curing agent with a binder, adding graphene nano sheets for multiple times, and uniformly mixing to obtain a modified internal curing material;
and uniformly stirring the composite cement, the coarse aggregate and the fine aggregate, then adding the fly ash, the mineral powder and the modified internal curing material, continuously stirring, finally adding the water reducer, the retarder and the water, and uniformly stirring to obtain the high-crack-resistance high-corrosion-resistance marine concrete.
The beneficial effects that technical scheme that this application provided brought include:
according to the preparation method, the modified internal curing material is prepared by adhering the graphene to the surface of the internal curing agent through the adhesive, and is applied to marine concrete, on one hand, the addition of the internal curing agent can reduce shrinkage of the concrete, shrinkage cracks are reduced, on the other hand, the graphene can play a role in supporting the collapse pores of the internal curing agent, and the strength performance of the concrete is improved.
The graphene in the modified internal curing material is uniformly dispersed inside concrete, the graphene has excellent heat conduction capability, the heat conduction performance of the concrete can be greatly improved, the temperature difference between the inside and the outside of the concrete is reduced, and meanwhile, the retarder plays a role in delaying the hydration heat release time of the cement, so that the problem that the early heat release amount of the sulfur (iron) aluminate cement type marine concrete is concentrated is solved, the condition that temperature cracks are generated due to overlarge temperature stress is avoided, the mechanical property, the impermeability and the corrosion resistance of the marine concrete are improved, and in addition, the retarder effectively solves the problems that the sulfur (iron) aluminate cement is coagulated and hardened and is difficult to construct.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
In a first aspect, an embodiment of the present application provides a high-crack-resistance high-corrosion-resistance marine concrete, which comprises the following raw materials in parts by weight:
220-260 parts of composite cement, 100-120 parts of fly ash, 60-80 parts of mineral powder, 700-800 parts of fine aggregate, 1000-1100 parts of coarse aggregate, 5-15 parts of modified internal curing material, 4.4-6.2 parts of water reducer, 1-2 parts of retarder and 140-160 parts of water;
the modified internal curing material comprises an internal curing agent, graphene nano sheets and a binder.
The nano graphene has excellent heat conduction performance and mechanical property, and is added into concrete after the inner curing agent is modified, so that on one hand, the heat conduction coefficient of the concrete can be obviously improved, and the temperature difference between the inside and the outside of the concrete is reduced, thereby greatly relieving the problem of concentrated early heat release of the marine concrete of sulfur (iron) aluminate cement, on the other hand, after the inner curing agent is released and collapsed, the graphene can play a role in supporting capillary holes, the strength loss of the concrete caused by the residual capillary holes of the inner curing agent released water is reduced, the mechanical property and the impermeability of the concrete are enhanced, and the corrosion resistance of the marine concrete is further improved. In addition, the dispersion of the nano graphene in the concrete is affected by the agglomeration phenomenon easily occurring in the nano graphene, and the nano graphene is bonded with an internal curing agent, so that the dispersibility of the graphene can be obviously improved.
In some embodiments, the composite cement comprises Portland cement, and
sulphoaluminate cement or aluminoferrite cement.
The method uses the sulfur (iron) aluminate cement to partially replace the ordinary silicate cement, avoids the problems of powder rising on the surface of concrete and easy corrosion of steel bars caused by low alkalinity of hydration products of the sulfur (iron) aluminate cement, and simultaneously, has a large amount of AFt generation in the hydration products of the sulfur (iron) aluminate cement, and can obviously improve the early strength, the impermeability and the corrosion resistance.
In some embodiments, the modified inner curing material comprises, in mass percent:
45-50% of internal curing agent, 45-50% of graphene nano-sheets and 5-10% of adhesive;
wherein the internal curing agent comprises super absorbent resin;
the binder comprises a polyurethane binder.
The super absorbent resin has excellent water absorption, water storage and water release characteristics, and when the super absorbent resin is added into concrete, a certain amount of water reservoirs are formed in the concrete, water is released to compensate water consumed by hydration, and the reduction of internal humidity is relieved, so that shrinkage deformation of the concrete material is effectively restrained, and shrinkage cracks are reduced. The surface of SAP in the modified internal curing material is wrapped by the adhesive, water exchange can not occur with the external environment in the concrete after the SAP is added, the aging and falling off conditions can occur after the SAP is in an alkaline water environment for a period of time because the alkali resistance and the water resistance of the polyurethane adhesive are poor, the SAP releases water to play an internal curing effect, and the regulation and control of the time of the SAP to play the internal curing effect can be realized through the change of the thickness of the adhesive layer. In addition, after the polyurethane binder is aged and failed, the binding force between the SAP and the graphene disappears, and when the SAP is released and collapsed, the graphene nano-sheet glued with the cement hydration product cannot collapse along with the SAP, so that the effect of supporting pores is achieved.
In a preferred embodiment, the graphene nanoplatelets have a radial dimension of 110-150 μm and a thickness of 10-20nm.
In some embodiments, the fine aggregate comprises river sand having a particle size of 0.1 to 0.6mm;
and/or the coarse aggregate comprises small stones with the continuous grading of 5-16mm and large stones with the continuous grading of 16-25 mm.
In a preferred embodiment, the apparent density of the river sand is not less than 2550kg/m 3 The apparent density of the small stone is not less than 2650kg/m 3 The apparent density of the cobble is not less than 2700kg/m 3 。
In some embodiments, the water reducing agent comprises a polycarboxylate water reducing agent;
and/or, the retarder comprises one of sucrose, glucose or citric acid.
The retarder can delay the hydration heat release time of cement and effectively solve the problems of quick setting and hardening of sulfur (iron) aluminate cement and difficult construction.
In some embodiments, the fly ash is class II fly ash;
and/or the mineral powder is S95 grade mineral powder.
Specifically, the screen residue of the square hole screen of the fly ash with the diameter of 45 mu m is not more than 25%, the water demand ratio is not more than 98%, and the loss on ignition is not more than 5%;
the density of the mineral powder is not less than 2.9g/cm 3 Specific surface area not less than 450m 2 And/kg, the loss on ignition is not more than 1%.
In a second aspect, the embodiment of the application provides a preparation method of the high-crack-resistance high-corrosion-resistance marine concrete, which comprises the following steps:
pre-wetting an internal curing agent with water, mixing the internal curing agent with a binder, adding graphene nano sheets for multiple times, and uniformly mixing to obtain a modified internal curing material;
and uniformly stirring the composite cement, the coarse aggregate and the fine aggregate, then adding the fly ash, the mineral powder and the modified internal curing material, continuously stirring, finally adding the water reducer, the retarder and the water, and uniformly stirring to obtain the high-crack-resistance high-corrosion-resistance marine concrete.
According to the invention, the graphene nanosheets are slowly added for multiple times, and are adhered to the surface of the SAP by using the polyurethane adhesive, so that the problems of difficult operation and uneven dispersion adhesion agglomeration caused by excessive viscosity due to direct one-time graphene addition and mixing are avoided.
The present application is further illustrated by the following specific examples.
Description of raw materials of each example and comparative example:
the Portland cement is P.O42.5 Portland cement.
The fly ash is class II fly ash, the screen residue of a 45 μm square hole screen is not more than 25%, the water demand ratio is not more than 98%, and the loss on ignition is not more than 5%.
The mineral powder is S95 grade mineral powder with density not less than 2.9g/cm 3 Specific surface area not less than 450m 2 Per kg, loss on ignition of not more than 1%。
The fine aggregate is well mixed river sand, the grain diameter is 0.1-0.6mm, and the apparent density is not less than 2550kg/m 3 。
The coarse aggregate is small stone and big stone with particle size of 5-16mm and 16-25mm, the stone grading is continuous grading, and the apparent density of the small stone is not less than 2650kg/m 3 The apparent density of the cobble is not less than 2700kg/m 3 。
The water reducer is a polycarboxylate water reducer.
The retarder is any one of sucrose, glucose or citric acid.
The binder is polyurethane binder.
The internal curing agent is super absorbent resin (SAP for short).
The raw materials of each component used in the invention are all commercial products unless specified.
Example 1
The marine concrete with high crack resistance and high corrosion resistance comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 5 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of adhesive and 50% of internal curing agent;
the preparation method comprises the following steps:
s1: adding a proper amount of water into SAP (super absorbent polymer) for prewetting, mixing with polyurethane binder at high speed for 15min, then slowly adding graphene nano-sheets for multiple times within 2min, and continuously mixing at high speed for 10min to obtain a modified internal curing material;
s2: placing the composite cement, the coarse aggregate and the fine aggregate into a stirrer according to the parts by weight, uniformly stirring, then adding the fly ash, the mineral powder and the modified internal curing material prepared by the steps, and continuously stirring;
s3: and (2) mixing the water reducer, the retarder and water according to the parts by weight to obtain uniform slurry, slowly adding the uniform slurry into the slurry obtained in the step (S2) in the stirring process, and uniformly mixing to obtain the high-crack-resistance high-corrosion-resistance marine concrete.
Example 2
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 8 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 3
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 10 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 4
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
100 parts of ordinary Portland cement, 140 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 5 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 5
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
100 parts of ordinary Portland cement, 140 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 8 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 6
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
100 parts of ordinary Portland cement, 140 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 10 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 7
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of aluminoferrite cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 5 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 8
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of aluminoferrite cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 8 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 9
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of aluminoferrite cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 10 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 10
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
100 parts of ordinary Portland cement, 140 parts of aluminoferrite cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 5 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 11
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
100 parts of ordinary Portland cement, 140 parts of aluminoferrite cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 8 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Example 12
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
100 parts of ordinary Portland cement, 140 parts of aluminoferrite cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 10 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Comparative example 1
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
240 parts of ordinary Portland cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of big stone, 147 parts of water, 10 parts of modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the modified internal maintenance material comprises the following components in percentage by mass: 45% of graphene nano-sheets, 5% of binder and 50% of internal curing agent.
Comparative example 2
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 10 parts of internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein the internal curing material is super absorbent resin.
Comparative example 3
The majority of the operating steps of example 1 were included, differing only in:
the material comprises the following raw materials in parts by mass:
140 parts of ordinary Portland cement, 100 parts of aluminoferrite cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 10 parts of internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein the internal curing material is super absorbent resin.
Comparative example 4
The marine concrete comprises the following raw materials in parts by weight:
140 parts of ordinary Portland cement, 100 parts of sulphoaluminate cement, 110 parts of fly ash, 70 parts of mineral powder, 770 parts of river sand, 212 parts of small stone, 848 parts of large stone, 147 parts of water, 10 parts of semi-modified internal curing material, 4.8 parts of water reducer and 1.4 parts of retarder;
wherein, the semi-modified internal curing material comprises the following components in percentage by mass: 50% of graphene nano-sheets and 50% of internal curing agent;
the preparation method comprises the following steps:
s1: adding a proper amount of water into SAP (super absorbent polymer) for prewetting, then slowly adding graphene nano sheets into the SAP for 2 minutes for high-speed mixing for 10 minutes to obtain a semi-modified internal curing material;
s2: placing the composite cement, the coarse aggregate and the fine aggregate into a stirrer according to the parts by weight, uniformly stirring, then adding the fly ash, the mineral powder and the semi-modified internal curing material prepared by the steps, and continuously stirring;
s3: and (2) mixing the water reducer, the retarder and water according to the parts by weight to obtain uniform slurry, slowly adding the uniform slurry into the slurry obtained in the step (S2) in the stirring process, and uniformly mixing to obtain the marine concrete.
Table 1: examples 1 to 12 and comparative examples 1 to 4 were prepared from the following components in parts by mass
Note that: "S" in Table 1 represents "example", for example: "S1" represents "example 1", and "D" represents "comparative example", for example: "D1" represents "comparative example 1".
Performance testing
The following performance tests were performed on the concretes prepared in examples 1 to 12 and comparative examples 1 to 4:
(1) Compressive strength: after the concretes prepared in examples 1 to 12 and comparative examples 1 to 4 were hardened for 7 days and 28 days, the concretes were tested with reference to a standard test piece of 150mm×150mm in GB/T50081-2019 Standard test method for physical mechanical Properties of concrete;
(2) Electric flux: after the concrete prepared in examples 1 to 12 and comparative examples 1 to 4 was hardened for 28 days, it was carried out by referring to the test method (electric flux method) for chlorine ion permeation resistance of cement concrete of T0580-2020 in the test procedure for Highway engineering Cement and cement concrete of JTG 3420-2020;
(3) Drying shrinkage: the shrinkage test method (contact method) of the cement concrete of T0574-2020 in JTG3420-2020, highway engineering Cement and Cement concrete test procedure is referred to, and each test result is filled in Table 2;
TABLE 2
According to the data in table 2, the improvement of the electric flux and the compressive strength of the example 3 (or 6,9, 12) are obvious compared with those of the comparative examples 1 and 28d, which shows that the sulfur (iron) aluminate cement can greatly improve the corrosion resistance of the marine concrete and improve the early strength;
compared with comparative examples 2 and 3, examples 3 and 9 can be found that the center temperature of 24h is reduced by more than 10 ℃, the compressive strength is improved by about 15MPa, the dry shrinkage value of 28d is slightly reduced, and the modified internal curing material can form a reservoir in the concrete to improve the shrinkage performance, and graphene nano sheets added into the modified internal curing material can improve the heat conduction performance of marine concrete, reduce the temperature stress, support the collapse pores of SAP and reduce the loss of mechanical performance;
comparative example 4 compared with example 3, only the SAP and the graphene nanoplatelets are simply mixed together, and there is no cohesiveness, which results in that the graphene and the SAP are dispersed and not positioned at the same position in the concrete mixing and forming process, so that after the SAP is collapsed by releasing water, pores corresponding to the original size of the SAP are left in the concrete, and the mechanical properties of the concrete are deteriorated;
from examples 1, 2 and 3, it can be seen that with the increase of the addition amount of the modified internal curing material, each performance of the concrete is slightly increased first and then basically kept unchanged, which indicates that the improvement effect of the graphene nano-sheet on the performance of the concrete has a threshold value, and the cost is only increased in a bare way after the addition amount is continuously increased. The sulfur (iron) aluminate cement and the modified internal curing material are used in combination, so that the corrosion resistance of marine concrete is greatly improved, the problem of concentrated early heat release amount of the sulfur (iron) aluminate cement can be effectively solved, in addition, the shrinkage performance of the concrete can be improved by the modified internal curing material, and the problem of mechanical property reduction caused by slump hole formed by SAP water release is avoided.
It should be noted that, in this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The marine concrete with high crack resistance and high corrosion resistance is characterized by comprising the following raw materials in parts by weight:
220-260 parts of composite cement, 100-120 parts of fly ash, 60-80 parts of mineral powder, 700-800 parts of fine aggregate, 1000-1100 parts of coarse aggregate, 5-15 parts of modified internal curing material, 4.4-6.2 parts of water reducer, 1-2 parts of retarder and 140-160 parts of water;
the modified internal curing material comprises an internal curing agent, graphene nano sheets and a binder.
2. The high crack and corrosion resistant marine concrete of claim 1, wherein said composite cement comprises Portland cement, an
Sulphoaluminate cement or aluminoferrite cement.
3. The high crack resistant and corrosion resistant marine concrete of claim 1, wherein said modified internal curing material comprises, in mass percent:
45-50% of internal curing agent, 45-50% of graphene nano-sheets and 5-10% of adhesive;
wherein the internal curing agent comprises super absorbent resin;
the binder comprises a polyurethane binder.
4. The high crack and corrosion resistant marine concrete of claim 3, wherein said polyurethane binder comprises glue, a viscosity modifier and a curing agent.
5. The high crack resistance and corrosion resistance marine concrete according to claim 3, wherein the graphene nanoplatelets have a radial dimension of 110-150 μm and a thickness of 10-20nm.
6. The high crack-resistant and high corrosion-resistant marine concrete according to claim 1, wherein said fine aggregate comprises river sand having a particle size of 0.1 to 0.6mm;
and/or the coarse aggregate comprises small stones with the continuous grading of 5-16mm and large stones with the continuous grading of 16-25 mm.
7. The high crack resistant high corrosion resistant marine concrete of claim 1, wherein said water reducing agent comprises a polycarboxylate water reducing agent;
and/or, the retarder comprises one of sucrose, glucose or citric acid.
8. The high crack resistance and corrosion resistance marine concrete according to claim 1, wherein the fly ash is class ii fly ash;
and/or the mineral powder is S95 grade mineral powder.
9. The method for preparing the high-crack-resistance high-corrosion-resistance marine concrete according to any one of claims 1 to 8, comprising the following steps:
pre-wetting an internal curing agent with water, mixing the internal curing agent with a binder, adding graphene nano sheets for multiple times, and uniformly mixing to obtain a modified internal curing material;
and uniformly stirring the composite cement, the coarse aggregate and the fine aggregate, then adding the fly ash, the mineral powder and the modified internal curing material, continuously stirring, finally adding the water reducer, the retarder and the water, and uniformly stirring to obtain the high-crack-resistance high-corrosion-resistance marine concrete.
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