CN114105564A - High-corrosion-resistance low-shrinkage concrete and preparation method thereof - Google Patents

High-corrosion-resistance low-shrinkage concrete and preparation method thereof Download PDF

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CN114105564A
CN114105564A CN202111479098.XA CN202111479098A CN114105564A CN 114105564 A CN114105564 A CN 114105564A CN 202111479098 A CN202111479098 A CN 202111479098A CN 114105564 A CN114105564 A CN 114105564A
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parts
resistance low
shrinkage concrete
aggregate
concrete
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CN114105564B (en
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胡成
陈平
向玮衡
李顺凯
刘荣进
周丽波
刘梦
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Guilin University of Technology
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Guilin University of Technology
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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
    • C04B28/04—Portland 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
    • 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
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0409—Waste from the purification of bauxite, e.g. red mud
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0418—Wet materials, e.g. slurries
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/062—Purification products of smoke, fume or exhaust-gases
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • C04B18/142—Steelmaking slags, converter slags
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42—Organo-silicon compounds
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/60—Agents for protection against chemical, physical or biological attack
    • C04B2103/65—Water proofers or repellants
    • 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
    • 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
    • C04B2111/346—Materials exhibiting reduced plastic shrinkage cracking
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
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  • Structural Engineering (AREA)
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  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a preparation method of high-corrosion-resistance low-shrinkage concrete. The high-strength anti-erosion concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 40-150 parts of modified composite mineral ultrafine powder, 1-4 parts of layered double hydroxide and nano SiO20.2-1.5 parts of medium-grade sand 160-240 parts of 5-20 mm continuous graded aggregate 280-340 parts of water 240-320 parts of functional efficient admixture 0.5-5 parts of functional efficient admixture. Mixing the water, cement, composite mineral superfine powder, medium-grade sand, aggregate, layered double hydroxide and nano SiO2And sequentially adding the functional high-efficiency admixture and the stirring machine, uniformly stirring, and preparing the high-corrosion-resistance low-shrinkage concrete after molding and curing. Through detection: the 7d hydration heat of the high-corrosion-resistance low-shrinkage concrete is less than or equal to 220kJ/kg, the strength grade is more than or equal to C45, the 56d electric flux is less than or equal to 850C, the 28d seawater erosion resistance coefficient is more than or equal to 1.12, and the 90d dry shrinkage is less than or equal to 350 multiplied by 10‑6. The invention has the characteristics of low hydration heat, high strength, small shrinkage, good corrosion resistance and high utilization rate of metallurgical solid wastes.

Description

High-corrosion-resistance low-shrinkage concrete and preparation method thereof
Technical Field
The invention belongs to the field of marine cementing materials. In particular to high-corrosion-resistance low-shrinkage concrete and a preparation method thereof.
Background
The high-performance concrete has the characteristics of high mechanical strength, good freeze thawing resistance and carbonization resistance and the like, is an ideal material for preparing marine infrastructure, and is widely applied to marine buildings such as harbors, bridges, submarine tunnels, breakwaters and the like. However, the high-performance concrete has poor stability and is easy to shrink and crack due to low water-gel ratio, high gel component and large self-drying shrinkage of the high-performance concrete. The shrinkage cracking of the concrete promotes the Cl in the seawater-、SO4 2-、Mg2+And when corrosive ions permeate into the interior, the mechanical strength and the durability of concrete are obviously reduced, the corrosion and the aging of a concrete structure are accelerated, the early deterioration and the damage of a building structure are caused, and the practicability and the safety of marine infrastructure are seriously influenced.
Although the technical patent 'high-performance machine-made sand marine concrete and preparation method thereof' provides the high-performance machine-made sand marine concrete with convenient construction, good working performance, high mechanical property and excellent durability, the technology can not solve the problem of concrete shrinkage cracking under dry and wet circulation. Technical patentHigh performance marine concrete (CN108101456B) with high water absorption rate and coarse aggregate has good workability and Cl resistance-The high-performance marine concrete with good ion erosion performance has the problems of high hydration heat and large shrinkage of the concrete. Although the technical patent 'concrete cement for maritime work' (CN106904911B) proposes a sea sand corrosion-resistant maritime work concrete, the technical process is complex, the required internal curing material, pore structure adjustment, an aggressive ion transmission inhibitor and an ultra-dispersion shrinkage-reducing external agent are all prepared and synthesized at high temperature, the cost is high, and the energy consumption is high.
The invention discloses high-corrosion-resistance low-shrinkage concrete and a preparation method thereof, aiming at the problems of large shrinkage and low durability of the concrete in a complex marine environment, belonging to the field of marine cementing materials2The marine engineering composite material is prepared from medium-grade sand, fine aggregate, water and a functional efficient additive, has the characteristics of low hydration heat, high strength, small shrinkage, good corrosion resistance and high solid waste utilization rate, can be better used in a severe marine environment, and prolongs the service life of marine engineering infrastructure.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method of high-corrosion-resistance low-shrinkage concrete, which has the advantages of low hydration heat, high mechanical strength, high solid waste utilization rate and simple preparation process.
In order to achieve the purpose, the invention adopts the technical scheme that:
the high-strength anti-erosion concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 20-60 parts of modified composite mineral ultrafine powder, 1-3 parts of layered double hydroxide and nano SiO20.2-1.5 parts of medium-grade sand 160-240 parts of 5-20 mm continuous graded aggregate 280-340 parts of water 240-320 parts of functional efficient admixture 0.5-5 parts of functional efficient admixture.
According to the raw material composition of the high corrosion-resistant low-shrinkage concrete, the water, the cement, the composite mineral ultrafine powder, the medium-grade sand, the aggregate and the layer are mixedDouble hydroxide, nano SiO2And sequentially adding the functional high-efficiency admixture and the stirring machine, uniformly stirring, and preparing the high-corrosion-resistance low-shrinkage concrete after molding and curing.
The density of the cement is more than or equal to 3.1kg/m3The specific surface area is more than or equal to 400m2Per kg of iron-rich portland cement; the mineral phase components of the cement are as follows: c3S44～48wt％，C2S26～32％，C2A1-xFx18 to 22 wt% of a solid solution, C3A3～5.5wt％。
The modified composite mineral ultrafine powder is prepared from water-quenched blast furnace slag, thermally-stewed converter steel slag, sintered flue gas desulfurization ash, hydrolyzed polymaleic anhydride and polyacrylic acid in a weight ratio of 70-85: 10-30: 1-5: 0.1-0.4: 0.05-0.15, grinding by an ultrafine vertical grinding machine, sieving by a 600-800 mesh sieve, and grinding for 1-6 h by a tube grinding machine.
The layered double hydroxide is one or more of calcium-aluminum hydrotalcite and magnesium-aluminum hydrotalcite prepared by a hydrothermal method. The layered double hydroxide is prepared by firstly heating the layered double hydroxide for 10-60 min by microwave at 450-480 ℃, and then heating the heated layered double hydroxide in Ca (OH)2Soaking in the saturated solution for 12-18 h, drying at 55-60 ℃ to constant weight, grinding and sieving with a 120-mesh sieve.
The aggregate is one or more of saturated pre-wetted red mud aggregate, silt aggregate and coral aggregate, and is mixed with the broken stone according to the weight ratio of 1: 1.5-1: 4.
The functional efficient admixture is a naphthalene water reducer, a polycarboxylic acid slump retaining agent, a polyethylhydroxy siloxane type anti-seepage agent and a calcium sulphoaluminate type expanding agent in a weight ratio of 20-40: 15-30: 10-25: 15-30, and uniformly mixing and stirring.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
1. the invention uses water quenching blast furnace slag, hot braising converter steel slag and modified composite mineral ultrafine powder prepared by sintering flue gas desulfurization ash to partially replace iron-rich portland cement, the replacement rate can reach 30-60 percent, and the invention has the characteristic of high utilization rate of metallurgical solid waste.
2. In the invention, C is used3The iron-rich silicate cement with low S content is compounded with the modified composite mineral ultrafine powder to serve as a gelling component, so that the hydration heat of concrete can be effectively reduced.
3. The invention utilizes fine aggregate, ultrafine powder and nano SiO2The dense stacking function of the concrete, and the filling of internal micropores by using the modified composite mineral ultrafine powder and the filling of internal nanopores by using a high-iron aluminum hydration product, obviously improve the compactness, the mechanical strength and the corrosion resistance of the concrete.
4. The invention utilizes the layered double hydroxide to adsorb Cl in seawater-、SO4 2-、Mg2+The anti-corrosion agent is used for preventing the corrosive ions from entering the concrete, inhibiting the migration and diffusion of the corrosive ions in the concrete and further improving the anti-corrosion capability of the concrete;
5. the invention maintains the internal humidity of the concrete by utilizing the water release internal curing effect of the pre-wet fine aggregate, and simultaneously reduces the shrinkage rate of the concrete by assisting the micro-expansion effect of the expanding agent.
6. The high-corrosion-resistance low-shrinkage concrete prepared by the invention has the advantages that the 7d hydration heat is less than or equal to 220kJ/kg, the strength grade is greater than or equal to C45, the 56d electric flux is less than or equal to 850C, the 28d seawater erosion resistance coefficient is greater than or equal to 1.12, and the 90d dry shrinkage is less than or equal to 350 multiplied by 10-6It has the features of low hydration heat, high strength, less shrinkage and high corrosion resistance.
Detailed Description
The present invention is further illustrated by the following detailed description, without limiting the scope of the invention.
In order to avoid repetition, the materials related to this embodiment are described in a unified manner, and are not described in the embodiments again:
the density of the cement is more than or equal to 3.1kg/m3The specific surface area is more than or equal to 400m2Per kg of iron-rich portland cement; the mineral phase components of the cement are as follows: c3S44～48wt％，C2S26～32％，C2A1-xFx18 to 22 wt% of a solid solution, C3A3～5.5wt％。
The modified composite mineral ultrafine powder is prepared from water-quenched blast furnace slag, thermally-stewed converter steel slag, sintered flue gas desulfurization ash, hydrolyzed polymaleic anhydride and polyacrylic acid in a weight ratio of 70-85: 10-30: 1-5: 0.1-0.4: 0.05-0.15, grinding by an ultrafine vertical grinding machine, sieving by a 600-800 mesh sieve, and grinding for 1-6 h by a tube grinding machine.
The layered double hydroxide is one or more of calcium-aluminum hydrotalcite and magnesium-aluminum hydrotalcite prepared by a hydrothermal method. The layered double hydroxide is prepared by firstly heating the layered double hydroxide for 10-60 min by microwave at 450-480 ℃, and then heating the heated layered double hydroxide in Ca (OH)2Soaking in the saturated solution for 12-18 h, drying at 55-60 ℃ to constant weight, grinding and sieving with a 120-mesh sieve.
The aggregate is one or more of saturated pre-wetted red mud aggregate, silt aggregate and coral aggregate, and is mixed with the broken stone according to the weight ratio of 1: 1.5-1: 4.
The functional efficient admixture is a naphthalene water reducer, a polycarboxylic acid slump retaining agent, a polyethylhydroxy siloxane type anti-seepage agent and a calcium sulphoaluminate type expanding agent in a weight ratio of 20-40: 15-30: 10-25: 15-30, and uniformly mixing and stirring.
Example 1
A high corrosion resistance low shrinkage concrete and a preparation method thereof. The specific preparation method described in this example is:
the high-strength anti-erosion concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 40-90 parts of modified composite mineral ultrafine powder, 1-2.5 parts of layered double hydroxide and nano SiO20.2-0.6 part of medium-grade sand, 160-180 parts of 5-20 mm continuous graded aggregate, 240-260 parts of water and 0.5-2 parts of functional efficient additive.
According to the raw material composition of the high corrosion-resistant low-shrinkage concrete, the water, the cement, the composite mineral ultrafine powder, the medium-grade sand, the aggregate, the layered double hydroxide and the nano SiO are sequentially mixed2Adding the functional high-efficiency admixture into a stirrer, uniformly mixing, and preparing the high-corrosion-resistance low-shrinkage concrete after molding and curing.
The high corrosion resistance low shrinkage concrete prepared in the embodiment is detected as follows: the stability is qualified, the hydration heat of 7d is 216.4kJ/kg, and the strength grade isThe flux of C60 and 56d is 837C, the seawater erosion resistance coefficient of 28d is 1.14, and the dry shrinkage rate of 90d is 328 multiplied by 10-6。
Example 2
A high corrosion resistance low shrinkage concrete and a preparation method thereof. The specific preparation method described in this example is:
the high-strength anti-erosion concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 60-110 parts of modified composite mineral ultrafine powder, 1.5-3 parts of layered double hydroxide and nano SiO20.5-0.9 part of medium-grade sand, 180-200 parts of medium-grade sand, 290-320 parts of 5-20 mm continuous graded aggregate, 260-280 parts of water and 1.5-3 parts of functional efficient additive.
According to the raw material composition of the high corrosion-resistant low-shrinkage concrete, the water, the cement, the composite mineral ultrafine powder, the medium-grade sand, the aggregate, the layered double hydroxide and the nano SiO are sequentially mixed2Adding the functional high-efficiency admixture into a stirrer, uniformly mixing, and preparing the high-corrosion-resistance low-shrinkage concrete after molding and curing.
The high corrosion resistance low shrinkage concrete prepared in the embodiment is detected as follows: the stability is qualified, the 7d hydration heat is 211.6kJ/kg, the strength grade reaches C55, the 56d electric flux is 817.3C, the 28d seawater erosion resistance coefficient is 1.15, and the 90d dry shrinkage is 332 multiplied by 10-6。
Example 3
A high corrosion resistance low shrinkage concrete and a preparation method thereof. The specific preparation method described in this example is:
the high-strength anti-erosion concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 80-130 parts of modified composite mineral ultrafine powder, 2-3.5 parts of layered double hydroxide and nano SiO20.8-1.2 parts of medium-grade sand, 200-220 parts of 5-20 mm continuous graded aggregate, 280-300 parts of water and 2.5-4 parts of functional efficient additive.
According to the raw material composition of the high corrosion-resistant low-shrinkage concrete, the water, the cement, the composite mineral ultrafine powder, the medium-grade sand, the aggregate, the layered double hydroxide and the nano SiO are sequentially mixed2Adding the functional high-efficiency additive into a stirrer, uniformly mixing, and preparing the high-corrosion-resistance low-corrosion-resistance product after molding and curingAnd (5) shrinking the concrete.
The high corrosion resistance low shrinkage concrete prepared in the embodiment is detected as follows: the stability is qualified, the 7d hydration heat is 201.7kJ/kg, the strength grade reaches C50, the 56d electric flux is 803.6C, the 28d seawater erosion resistance coefficient is 1.12, and the 90d dry shrinkage is 314 multiplied by 10-6。
Example 4
A high corrosion resistance low shrinkage concrete and a preparation method thereof. The specific preparation method described in this example is:
the high-strength anti-erosion concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 100-150 parts of modified composite mineral ultrafine powder, 2.5-4 parts of layered double hydroxide and nano SiO21.0-1.5 parts of medium-grade sand 220-240 parts of 5-20 mm continuous graded aggregate 310-340 parts of water 300-320 parts of functional efficient additive 3.5-5 parts of the functional efficient additive.
According to the raw material composition of the high corrosion-resistant low-shrinkage concrete, the water, the cement, the composite mineral ultrafine powder, the medium-grade sand, the aggregate, the layered double hydroxide and the nano SiO are sequentially mixed2Adding the functional high-efficiency admixture into a stirrer, uniformly mixing, and preparing the high-corrosion-resistance low-shrinkage concrete after molding and curing.
The high corrosion resistance low shrinkage concrete prepared in the embodiment is detected as follows: the stability is qualified, the 7d hydration heat is 193.5kJ/kg, the strength grade reaches C45, the 56d electric flux is 789.3C, the 28d seawater erosion resistance coefficient is 1.13, and the 90d dry shrinkage is 327 multiplied by 10-6。

Claims (7)

1. The preparation method of the high-corrosion-resistance low-shrinkage concrete is characterized in that the high-strength anti-corrosion concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 40-150 parts of modified composite mineral ultrafine powder, 1-4 parts of layered double hydroxide and nano SiO20.2-1.5 parts of medium-grade sand 160-240 parts of 5-20 mm continuous graded aggregate 280-340 parts of water 240-320 parts of functional efficient additive 0.5-5 parts of water;
according to the raw material composition of the high corrosion-resistant low-shrinkage concrete, the water, the cement, the composite mineral ultrafine powder, the medium-grade sand, the aggregate, the layered double hydroxide and the nanometerSiO2And sequentially adding the functional high-efficiency admixture and the stirring machine, uniformly stirring, and preparing the high-corrosion-resistance low-shrinkage concrete after molding and curing.
2. The method for preparing high corrosion resistance low shrinkage concrete according to claim 1, wherein the cement has a density of 3.1kg/m or more3The specific surface area is more than or equal to 400m2Per kg of iron-rich portland cement; the mineral phase components of the cement are as follows: c3S44～48wt％，C2S26～32％，C2A1-xFx18 to 22 wt% of a solid solution, C3A3～5.5wt％。
3. The preparation method of the high corrosion resistance low shrinkage concrete according to claim 1, wherein the modified composite mineral ultrafine powder is water quenched blast furnace slag, thermally stewed converter steel slag, sintered flue gas desulfurization ash, hydrolyzed polymaleic anhydride and polyacrylic acid in a weight ratio of 70-85: 10-30: 1-5: 0.1-0.4: 0.05-0.15, grinding by an ultrafine vertical grinding machine, sieving by a 600-800 mesh sieve, and grinding for 1-6 h by a tube grinding machine.
4. The method for preparing high corrosion resistance low shrinkage concrete according to claim 1, wherein the layered double hydroxide is one or more of calcium aluminum hydrotalcite and magnesium aluminum hydrotalcite prepared by hydrothermal method; the layered double hydroxide is prepared by firstly heating the layered double hydroxide for 10-60 min by microwave at 450-480 ℃, and then heating the heated layered double hydroxide in Ca (OH)2Soaking in the saturated solution for 12-18 h, drying at 55-60 ℃ to constant weight, grinding and sieving with a 120-mesh sieve.
5. The method for preparing high corrosion resistance low shrinkage concrete according to claim 1, wherein the aggregate is one or more of saturated pre-wetted red mud aggregate, silt aggregate and coral aggregate, and the weight ratio of the aggregate to the crushed stone is 1: 1.5-1: 4.
6. The method for preparing high corrosion resistance low shrinkage concrete according to claim 1, wherein the functional high efficiency admixture is a naphthalene water reducing agent, a polycarboxylic acid slump retaining agent, a polyethyl hydroxy siloxane type anti-permeability agent and a calcium sulphoaluminate type expanding agent in a weight ratio of 20-40: 15-30: 10-25: 15-30, and uniformly mixing and stirring.
7. The method for producing a high corrosion resistance low shrinkage concrete according to claim 1, wherein the high corrosion resistance low shrinkage concrete is a high corrosion resistance low shrinkage concrete produced by the method for producing a high corrosion resistance low shrinkage concrete according to any one of claims 1 to 6.
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