CN114105564B - 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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CN114105564B
CN114105564B CN202111479098.XA CN202111479098A CN114105564B CN 114105564 B CN114105564 B CN 114105564B CN 202111479098 A CN202111479098 A CN 202111479098A CN 114105564 B CN114105564 B CN 114105564B
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concrete
shrinkage
aggregate
corrosion
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CN114105564A (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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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • 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 portions of cement, 40 to 150 portions of modified composite mineral ultrafine powder, 1 to 4 portions of layered double hydroxide and nano SiO 2 0.2 to 1.5 portions of medium-grade sand 160 to 240 portions, 280 to 340 portions of 5 to 20mm continuous graded aggregate, 240 to 320 portions of water and 0.5 to 5 portions of functional high-efficiency admixture. Mixing the water, cement, composite mineral superfine powder, medium-grade sand, aggregate, layered double hydroxide and nano SiO 2 And sequentially adding the functional high-efficiency admixture into a stirrer, uniformly stirring, and forming and curing to prepare the high-corrosion-resistance low-shrinkage concrete. 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 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 ‑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 - 、SO 4 2- 、Mg 2+ 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. The technical patent 'a high-performance marine concrete with coarse aggregate with high water absorption' (CN 108101456B) proposes that the workability is good and the Cl resistance is good - 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' (CN 106904911B) 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 required to be 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, which aim at the problems of large concrete shrinkage and low durability in a complex marine environment, belong to the field of marine cementing materials, and are characterized in thatThe concrete is prepared from cement, modified superfine composite mineral powder, layered double hydroxide and nano SiO 2 The 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 provide the preparation method of the high-corrosion-resistance low-shrinkage concrete with 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-corrosion concrete is prepared from the following raw materials in parts by weight: 100 portions of cement, 20 to 60 portions of modified composite mineral ultrafine powder, 1 to 3 portions of layered double hydroxide and nano SiO 2 0.2 to 1.5 portions of medium-grade sand 160 to 240 portions, 280 to 340 portions of 5 to 20mm continuous graded aggregate, 240 to 320 portions of water and 0.5 to 5 portions of functional high-efficiency 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, the layered double hydroxide and the nano SiO are mixed 2 And 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/m 3 The specific surface area is more than or equal to 400m 2 Per kg of iron-rich portland cement; the mineral phase components of the cement are as follows: c 3 S44～48wt％，C 2 S26～32％，C 2 A 1-x F x 18 to 22wt% of solid solution, C 3 A3～5.5wt％。
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 to 30:1 to 5:0.1 to 0.4:0.05 to 0.15, grinding the mixture by an ultrafine vertical mill, sieving the mixture by a 600 to 800-mesh sieve, and grinding the mixture for 1 to 6 hours by a tube mill.
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 firstly heated by microwave at 450-480 ℃ for 10-60 min and then added with Ca (OH) 2 Soaking in saturated solution for 12-18 h, drying at 55-60 deg.C to constant weight, grinding, and sieving with 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 broken stones according to the weight ratio of 1: 1.5-1.
The functional high-efficiency admixture is a naphthalene water reducer, a polycarboxylic acid slump retaining agent, a polyethylhydroxy siloxane type anti-permeability agent and a calcium sulphoaluminate type expanding agent in a weight ratio of 20-40: 15 to 30:10 to 25: 15-30, and mixing and stirring evenly.
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, use C 3 The iron-rich portland cement with low S content is compounded with the modified composite mineral ultrafine powder to be used 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 SiO 2 The 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 - 、SO 4 2- 、Mg 2+ The anti-permeability 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 water permeability of the concreteThe corrosion resistance of the concrete is improved;
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 corrosion 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 -6 It 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 as follows, which is not described in the embodiments again:
the density of the cement is more than or equal to 3.1kg/m 3 The specific surface area is more than or equal to 400m 2 Per kg of iron-rich portland cement; the mineral phase components of the cement are as follows: c 3 S44～48wt％，C 2 S26～32％，C 2 A 1-x F x 18 to 22wt% of solid solution, C 3 A3～5.5wt％。
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 to 30:1 to 5:0.1 to 0.4:0.05 to 0.15, grinding the mixture by an ultrafine vertical mill, sieving the mixture by a 600 to 800-mesh sieve, and grinding the mixture for 1 to 6 hours by a tube mill.
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 first microwave heated at 450-480 deg.c for 10-60 min and then Ca (OH) 2 Soaking in saturated solution for 12-18 h, drying at 55-60 deg.C to constant weight, grinding, and sieving with 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.
The functional high-efficiency admixture is a naphthalene water reducer, a polycarboxylic acid slump retaining agent, a polyethylhydroxy siloxane type anti-permeability agent and a calcium sulphoaluminate type expanding agent in a weight ratio of 20-40: 15 to 30:10 to 25: 15-30, and mixing and stirring evenly.
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 portions of cement, 40 to 90 portions of modified composite mineral ultrafine powder, 1 to 2.5 portions of layered double hydroxide and nano SiO 2 0.2 to 0.6 portion of medium-grade sand, 160 to 180 portions of 5 to 20mm continuous graded aggregate, 240 to 260 portions of water and 0.5 to 2 portions of functional high-efficiency admixture.
According to the raw material composition of the high corrosion resistance 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 mixed 2 Adding 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 in 7 days is 216.4kJ/kg, the strength grade reaches C60, the electric flux in 56 days is 837C, the seawater erosion resistance coefficient in 28d is 1.14, the dry shrinkage rate in 90 days 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-corrosion concrete is prepared from the following raw materials in parts by weight: 100 portions of cement, 60 to 110 portions of modified composite mineral ultrafine powder, 1.5 to 3 portions of layered double hydroxide and nano SiO 2 0.5 to 0.9 portion of medium-grade sand, 180 to 200 portions of medium-grade sand, 290 to 320 portions of 5 to 20mm continuous graded aggregate, 260 to 280 portions of water and 1.5 to 3 portions of functional high-efficiency admixture.
According to the raw material composition of the high corrosion resistance low shrinkage concrete, the water, the cement and the composite mineral ultrafine powder are sequentially mixedMedium grade sand, aggregate, layered double hydroxide, nano SiO 2 And adding the functional high-efficiency admixture into a stirrer, uniformly mixing, and forming and curing to obtain the high-corrosion-resistance low-shrinkage 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 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 portions of cement, 80 to 130 portions of modified composite mineral ultrafine powder, 2 to 3.5 portions of layered double hydroxide and nano SiO 2 0.8 to 1.2 parts of medium-grade sand, 200 to 220 parts of 5 to 20mm continuous graded aggregate, 280 to 300 parts of water and 2.5 to 4 parts of functional high-efficiency 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 mixed 2 Adding 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 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 portions of cement, 100 to 150 portions of modified composite mineral ultrafine powder, 2.5 to 4 portions of layered double hydroxide and nano SiO 2 1.0 to 1.5 portions of medium-grade sand 220 to 240 portions of 5 to 20mm continuous graded aggregate 310 to 340 portions of water 300 to 320 portions of cement3.5 to 5 portions of performance high-efficiency 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 mixed 2 Adding 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 seawater erosion resistance coefficient of 28d is 1.13, and the 90d dry shrinkage is 327 multiplied by 10 -6 。

Claims (5)

1. The preparation method of the high corrosion-resistant low-shrinkage concrete is characterized in that the high corrosion-resistant low-shrinkage concrete is prepared from the following raw materials in parts by weight: 100 portions of cement, 40 to 150 portions of modified composite mineral ultrafine powder, 1 to 4 portions of layered double hydroxide and nano SiO 2 0.2 to 1.5 parts of medium-grade sand, 160 to 240 parts of medium-grade sand, 280 to 340 parts of 5 to 20mm continuous graded aggregate, 240 to 320 parts of water and 0.5 to 5 parts of functional high-efficiency additive; 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 to 30:1 to 5:0.1 to 0.4:0.05 to 0.15, grinding the mixture by an ultrafine vertical mill, sieving the mixture by a 600 to 800-mesh sieve, and grinding the mixture for 1 to 6 hours by a tube mill;
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 mixed 2 And sequentially adding the functional high-efficiency admixture into a stirrer, uniformly stirring, and forming and curing to prepare the high-corrosion-resistance low-shrinkage concrete.
2. The method for preparing the 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 a hydrothermal method; the layered double hydroxide is especiallyFirstly, microwave heating at 450-480 ℃ for 10-60 min, then adding Ca (OH) 2 Soaking in saturated solution for 12-18 h, drying at 55-60 deg.C to constant weight, grinding and sieving with 120 mesh sieve.
3. The preparation method of the concrete with high corrosion resistance and low shrinkage as claimed in claim 1, wherein the aggregate is one or more of saturated pre-wetted red mud aggregate, silt aggregate and coral aggregate, and is mixed with crushed stones in a weight ratio of 1: 1.5-1.
4. 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 to 30:10 to 25: 15-30, and mixing and stirring uniformly.
5. A high corrosion resistance low shrinkage concrete prepared by the method of any one of claims 1 to 4.
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