CN112142405A - C80 strength grade high-performance concrete and preparation method thereof - Google Patents
C80 strength grade high-performance concrete and preparation method thereof Download PDFInfo
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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
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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
- 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
- C04B14/047—Zeolites
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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
- 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
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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
- 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
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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
- 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
- C04B18/146—Silica fume
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- 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
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- 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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Abstract
The application relates to the field of concrete, and particularly discloses C80 strength grade high-performance concrete and a preparation method thereof, wherein the concrete comprises the following components in parts by weight: 100-160 parts of water, 300-400 parts of Portland cement, 550-620 parts of sand, 950-1200 parts of broken stone, 25-35 parts of silica powder, 90-120 parts of mineral admixture, 2-6 parts of polycarboxylic acid high-efficiency water reducing agent and 12-25 parts of filler; the filler comprises the following raw materials in parts by weight: 3-6 parts of polyvinyl alcohol resin, 4-7 parts of water, 0.5-1 part of defoaming agent, 1.5-3 parts of fumed silica, 0.8-2 parts of starch and 1.2-3 parts of zeolite powder. The preparation method comprises the following steps: the method comprises the following steps: preparing a filler; step two: the silicate cement, the sand and the broken stone are uniformly mixed, and water, silica powder, mineral admixture, filler and polycarboxylic acid high-efficiency water reducing agent are added while stirring. The concrete prepared by the method meets the index of C80 strength grade, and has strong impermeability and anti-carbonization performance and excellent impact resistance.
Description
Technical Field
The application relates to the field of concrete, in particular to high-performance concrete with a C80 strength grade and a preparation method thereof.
Background
Concrete is one of the most important civil engineering materials of the present generation. The artificial stone is prepared by a cementing material, granular aggregate (also called aggregate), water, an additive and an admixture which are added if necessary according to a certain proportion, and is formed by uniformly stirring, closely compacting, curing and hardening. The concrete has the characteristics of rich raw materials, low price and simple production process, so the dosage of the concrete is increased more and more.
Along with the rapid development of engineering fields such as bridges and high-rise buildings in China, the performance requirements on various aspects such as concrete strength are higher and higher, compared with the high-rise building engineering, the bridge engineering is located outdoors, bridge concrete is directly exposed in an open-air environment, the environment is worse, the bridge pier and air interface suffers from water impact for a long time due to the change of water level, the reciprocating is carried out, the concrete structure is more seriously corroded, the bridge body is easy to crack after a long time, and potential safety hazards are caused, so that the development of concrete with high strength, good impermeability and good impact resistance is urgently needed.
Disclosure of Invention
In order to improve the strength of concrete and improve the impermeability and the impact resistance of the concrete, the application provides high-performance concrete with a C80 strength grade and a preparation method thereof.
In a first aspect, the present application provides a high performance concrete of C80 strength grade, which adopts the following technical scheme:
the high-performance concrete with the strength grade of C80 comprises the following components in parts by weight: 100-160 parts of water, 300-400 parts of Portland cement, 550-620 parts of sand, 950-1200 parts of broken stone, 25-35 parts of silica powder, 90-120 parts of mineral admixture, 2-6 parts of polycarboxylic acid high-efficiency water reducing agent and 12-25 parts of filler;
the filler comprises the following raw materials in parts by weight: 3-6 parts of polyvinyl alcohol resin, 4-7 parts of water, 0.5-1 part of defoaming agent, 1.5-3 parts of fumed silica, 0.8-2 parts of starch and 1.2-3 parts of zeolite powder.
By adopting the technical scheme, the silica powder has small granularity, extremely large specific surface area and extremely high activity, and plays a filling effect and a volcanic ash reaction in the concrete, so that the concrete becomes more compact, and the strength of the concrete is greatly improved. The addition of the mineral admixture enables the product of cement clinker mineral hydration to react with the active oxide, can generate more gel materials, enables the concrete structure to be more compact, and is beneficial to improving the strength grade and the impermeability of the product.
The polyvinyl alcohol resin, the starch and the water form a bonding system which mainly plays a role in bonding, improves the bonding force among concrete aggregates and improves the interface structure of the concrete, and the fumed silica is dispersed in the formed bonding system to form a silica aggregate network in the system, thereby playing a certain role in reinforcement and simultaneously filling cracks generated in the shrinkage process of the concrete. Due to the small particle size and high surface energy of the fumed silica, the fumed silica can disperse other components, the dispersity of the components is improved, the fumed silica can be adsorbed on the surfaces of powder particles to form a surface layer on the surfaces, and the impact resistance and the impermeability of concrete are improved. The starch is added to cooperate with the polyvinyl alcohol resin, so that the concrete structure is more compact due to the cohesive force among concrete aggregates.
The defoaming agent has good foam inhibiting and defoaming performances, can inhibit and eliminate bubbles generated when the polyvinyl alcohol resin is dissolved in water, and improves the performance of the filler; meanwhile, the defoaming agent can also inhibit or eliminate bubbles generated in the preparation process of the concrete, and the surface smoothness of the concrete is improved, so that the comprehensive quality of the concrete is improved.
The zeolite powder has large internal surface area, provides a large space for cement hydration, improves the internal structure of the concrete after being doped with the zeolite powder, has certain hydraulicity, generates strength under the excitation of cement clinker, and further improves the strength of the concrete; meanwhile, the zeolite powder can be cooperatively matched with an adhesive system formed by other raw materials, so that the interface performance of the concrete is improved, and the strength of the concrete is improved.
Preferably, the defoaming agent is a polyether defoaming agent.
By adopting the technical scheme, the proper defoaming agent is optimized, bubbles generated in the dissolution of the polyvinyl alcohol resin are inhibited and eliminated, and the bubbles generated in the preparation process of the concrete can be reduced, so that the surface of the prepared concrete is smooth, and the quality of the concrete is improved.
Preferably, the mineral admixture consists of fly ash and granulated blast furnace slag powder, and the loose volume weight of the fly ash is 700 and 900 kilograms per m3The specific surface area of the granulated blast furnace slag powder is 400-420m2/㎏。
By adopting the technical scheme, the high-performance mineral admixture is added into the concrete, so that the using amount of portland cement can be effectively reduced, the synergistic effect of the fly ash and the silicon powder makes up the disadvantage of insufficient early strength of the steel slag powder, and the stable development of the full-age strength is ensured.
Preferably, the mass ratio of the fly ash to the granulated blast furnace slag powder is (1-2): 1.
Preferably, the portland cement is P.O52.5R-grade portland cement, the sand is limestone or dolomite machine-made sand with the fineness modulus of 2.5-3.1, and the crushed stone is continuous graded limestone or dolomite machine-made crushed stone with the particle size of 5-20 mm.
By adopting the technical scheme, the proportion of the components in the mineral admixture is further optimized, and the adaptive raw material components are selected, so that the synergistic effect among the components can promote the hydration of the cementing material to be more sufficient, the microstructure inside the concrete is improved, the number of harmful pores is reduced, and the internal structure of the concrete is more compact.
In a second aspect, the present application provides a method for preparing a high-performance concrete with a C80 strength grade, which adopts the following technical scheme:
preferably, the method comprises the following steps:
the method comprises the following steps: preparing a filler;
step two: the silicate cement, the sand and the broken stone are uniformly mixed, and water, silica powder, mineral admixture, filler and polycarboxylic acid high-efficiency water reducing agent are added while stirring.
Preferably, the preparation of the filler comprises the following steps:
step 1: dissolving polyvinyl alcohol resin and a defoaming agent in water at the temperature of 20-30 ℃, slowly stirring to fully swell the polyvinyl alcohol resin, heating to 80 ℃ at the temperature rising rate of 2-3 ℃ while stirring to accelerate the dissolution of the polyvinyl alcohol resin, and preserving heat for 1-2 hours to prepare a polyvinyl alcohol resin solution;
step 2: sequentially adding starch and fumed silica into the polyvinyl alcohol resin solution while stirring to obtain a suspension, and evaporating the suspension to remove water to obtain a semi-finished product;
and step 3: uniformly mixing the semi-finished product prepared in the step three with zeolite powder, and then extruding and granulating in an extruder to prepare filler particles;
and 4, step 4: and crushing the filler particles to obtain the filler.
By adopting the technical scheme, the polyvinyl alcohol resin and the defoaming agent are firstly dissolved in warm water to fully swell the polyvinyl alcohol resin, the defoaming agent is added to inhibit the generation of foam, the temperature is raised while stirring, so that the polyvinyl alcohol resin is accelerated to be dissolved to form a polyvinyl alcohol resin solution, the polyvinyl alcohol resin solution has good cohesiveness, the starch and the fumed silica are sequentially added to form a cohesive system between the polyvinyl alcohol resin solution and the starch, and then the fumed silica is added, so that the dispersing performance of the whole system can be improved, and a silica aggregate network can be formed in the system. The zeolite powder is added and then the granulation operation is carried out, so that the uniformity of each component is maintained, the distribution of each component in the filler is improved, the quality of the filler is improved, the compatibility of the filler and other components is increased, and the comprehensive performance of the concrete is synergistically improved.
Preferably, in the step 2, the drying is performed at a temperature of 70-85 ℃ for 30-40 min.
By adopting the technical scheme, the drying is carried out at 70-85 ℃, the moisture is quickly dried by distillation, and the stability of the whole system is ensured.
Preferably, in step 4, the filler particles are crushed to less than 10 μm.
By adopting the technical scheme, the filler particles are crushed to be less than 10 mu m, the granularity is small, the dispersion performance is good, and the using effect of the filler is improved.
In summary, the present application has the following beneficial effects:
1. the silicon powder and the mineral admixture are added, so that the overall strength performance and the impermeability of the concrete are improved.
2. The filler is prepared by adopting a specific method, so that the prepared filler is cooperatively matched with all raw material components, the hydration of the cementing material is promoted to be more sufficient, the microstructure in the concrete is improved, and the overall strength and the comprehensive performance of the concrete are improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in the following examples and comparative examples are all common commercially available raw materials.
Examples
Example 1
A high-performance concrete with a C80 strength grade comprises the following components in parts by weight: 140 kg of water, 374 kg of portland cement, 600 kg of sand, 1164 kg of rubbles, 31 kg of silicon powder, 115 kg of mineral admixture, 5 kg of polycarboxylic acid high-efficiency water reducing agent and 12 kg of filler; the filler comprises the following raw materials by weight: 3 kilograms of polyvinyl alcohol resin, 4 kilograms of water, 0.5 kilograms of defoaming agent, 1.5 kilograms of fumed silica, 0.8 kilograms of starch and 1.2 kilograms of zeolite powder;
the used portland cement is P. O52.5R-grade portland cement, the sand is medium coarse machine-made sand of limestone with good gradation, the fineness modulus is 2.5-3.1, the preferred fineness modulus is 2.8, and the crushed stone is limestone crushed stone with 5-20mm continuous gradation;
the mineral admixture comprises 50 kg of fly ash and 65 kg of granulated blast furnace slag powder, the fly ash is high-quality class I fly ash, and the loose unit weight of the fly ash is 800 kg/m3The water demand ratio is not more than 95 percent, and the specific surface area of the used granulated blast furnace slag powder is 420m2/㎏；
The polycarboxylic acid high-efficiency water reducing agent is purchased from Xika (China) Co., Ltd, and the water reducing rate reaches more than 30%;
the defoaming agent is GP type glycerol polyether;
the preparation method comprises the following steps: the method comprises the following steps: preparing a filler;
the preparation of the filler comprises the following steps:
step 1: dissolving polyvinyl alcohol resin and a defoaming agent in water at 25 ℃, slowly stirring to fully swell the polyvinyl alcohol resin, heating to 80 ℃ at a heating rate of 2-3 ℃ while stirring to accelerate dissolution of the polyvinyl alcohol resin, and keeping the temperature for 1.2 hours to prepare a polyvinyl alcohol resin solution;
step 2: sequentially adding starch and fumed silica into the polyvinyl alcohol resin solution while stirring to obtain a suspension, evaporating the suspension at 70 deg.C for 40min, and evaporating to obtain a semi-finished product;
and step 3: uniformly mixing the semi-finished product prepared in the step three with zeolite powder, and then extruding and granulating in an extruder to prepare filler particles;
and 4, step 4: crushing filler particles to obtain the filler, wherein the particle size of the filler is less than 10 mu m;
step two: the silicate cement, the sand and the broken stone are uniformly mixed, and water, silica powder, mineral admixture, filler and polycarboxylic acid high-efficiency water reducing agent are added while stirring.
Examples 2-9 differ from example 1 only in the ratios of the components, and the masses of the components in examples 1-9 are shown in table 1.
TABLE 1 Components of examples 1-9
Example 10
The difference from the embodiment 9 is that the preparation method of the high-performance concrete with the strength grade of C80 comprises the following steps:
the method comprises the following steps: preparing a filler;
the preparation of the filler comprises the following steps:
step 1: dissolving polyvinyl alcohol resin and a defoaming agent in water at 30 ℃, slowly stirring to fully swell the polyvinyl alcohol resin, heating to 80 ℃ at a heating rate of 2-3 ℃ while stirring to accelerate dissolution of the polyvinyl alcohol resin, and keeping the temperature for 2 hours to prepare a polyvinyl alcohol resin solution;
step 2: sequentially adding starch and fumed silica into the polyvinyl alcohol resin solution while stirring to obtain a suspension, evaporating the suspension at 85 deg.C for 30min, and evaporating to obtain a semi-finished product;
and step 3: uniformly mixing the semi-finished product prepared in the step three with zeolite powder, and then extruding and granulating in an extruder to prepare filler particles;
and 4, step 4: crushing filler particles to obtain the filler, wherein the particle size of the filler is less than 10 mu m;
step two: the silicate cement, the sand and the broken stone are uniformly mixed, and water, silica powder, mineral admixture, filler and polycarboxylic acid high-efficiency water reducing agent are added while stirring.
Comparative example
Comparative example 1
The difference from example 1 is that the filler was not added, and the rest is the same as example 1.
Comparative example 2
The difference from example 1 is that the filler does not contain fumed silica, and the rest is the same as example 1.
Comparative example 3
The difference from example 1 is that the filler does not contain starch, and the rest is the same as example 1.
Comparative example 4
The difference from example 1 is that the preparation of the filler comprises the following steps:
step 1: dissolving polyvinyl alcohol resin, starch, fumed silica and a defoaming agent in water at 20-30 ℃, slowly stirring to fully swell the polyvinyl alcohol resin, heating to 80 ℃ at a heating rate of 2-3 ℃ while stirring, fully mixing uniformly, preserving heat for 1-2 hours, and evaporating to remove water to obtain a semi-finished product;
step 2: uniformly mixing the semi-finished product prepared in the step three with zeolite powder to prepare filler particles;
and step 3: the filler particles were crushed to 10 μm to obtain a filler.
Performance test
The concrete test blocks prepared in examples 1 to 10 and comparative examples 1 to 4 were cured under standard conditions and tested for compressive strength, permeation resistance, carbonization resistance and impact resistance, and the results are shown in Table 2.
Compressive strength: the compression strength of the concrete standard test block measured on the 28 th day and the 56 th day is detected according to the specification in GB/T50010 concrete structure design Specification.
And (3) permeation resistance: the water penetration depth of the concrete standard test block prepared in each example and each comparative example was measured according to the stepwise pressurization method in GB/T50082 "test method Standard for Long-term Performance and durability of ordinary concrete".
And (3) carbonization resistance: the concrete standard test blocks prepared in the examples and comparative examples were tested for carbonization depth on day 28 according to the carbonization test in GB/T50082 Standard test methods for Long-term Performance and durability of ordinary concrete.
Impact resistance: and taking out the cured standard test block, preserving the heat for 4 hours at-20 ℃, 0 ℃ and 40 ℃, carrying out impact test on the concrete test block by using an impact tester, and detecting whether the concrete cracks when impacted at various temperatures.
TABLE 3 test results
As can be seen from examples 1-4, the components and the proportions of different raw materials have certain influence on the strength, the impermeability and the impermeability of the concrete, and when the mass ratio of the fly ash to the granulated blast furnace slag is 1:1, the strength grade of the concrete is obviously improved; as can be seen from comparative examples 5 to 9, the composition and the proportion of the filler have a certain influence on the strength, the impermeability and the carbonization resistance of the concrete, and the component proportion of example 9 is better.
It can be seen from example 1 and comparative example 1 that, in comparative example 1, no filler was added, the strength of the concrete prepared in comparative example 1 was significantly reduced, and the impermeability and the anti-carbonization performance thereof were significantly reduced, and under the same impact test conditions, cracks were generated on the surface of the concrete test block, the impact resistance of the concrete prepared without the filler was poor, and the ability to maintain the shape upon impact was significantly reduced, whereby it can be seen that the addition of the filler component had a significant effect on the strength, impermeability, anti-carbonization performance and impact resistance of the concrete.
As can be seen from example 1 and comparative examples 2 and 3, the addition of fumed silica or starch, in synergistic combination with other components in the filler, improves the strength, impermeability and carbonation resistance of the concrete.
As can be seen from example 1 and comparative example 4, the preparation method of the filler has significant influence on the strength, the impermeability and the carbonization resistance of the concrete.
As can be seen from table 4, the concrete test blocks prepared in examples 1 to 10 of the present application satisfy the index of the C80 strength grade, have high impermeability and high carbonization resistance, and are subjected to impact tests at three different temperatures, so that the concrete surface is damaged by impact, but no crack is generated at the damaged part, and thus it can be seen that the concrete prepared by the present application has stable mechanical properties at various temperatures, and the concrete has high shape retention capability when subjected to impact at various temperatures, is not easy to generate crack, and has excellent impact resistance.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The high-performance concrete with the strength grade of C80 is characterized by comprising the following components in parts by weight: 100-160 parts of water, 300-400 parts of Portland cement, 550-620 parts of sand, 950-1200 parts of broken stone, 25-35 parts of silica powder, 90-120 parts of mineral admixture, 2-6 parts of polycarboxylic acid high-efficiency water reducing agent and 12-25 parts of filler;
the filler comprises the following raw materials in parts by weight: 3-6 parts of polyvinyl alcohol resin, 4-7 parts of water, 0.5-1 part of defoaming agent, 1.5-3 parts of fumed silica, 0.8-2 parts of starch and 1.2-3 parts of zeolite powder.
2. The high performance concrete of C80 strength class according to claim 1, wherein: the defoaming agent is a polyether defoaming agent.
3. The high performance concrete of C80 strength class according to claim 1, wherein: the mineral admixture consists of fly ash and granulated blast furnace slag powder, and the loose bulk density of the fly ash is 700 and 900 kg/m3The specific surface area of the granulated blast furnace slag powder is 400-420m2/㎏。
4. The high performance concrete of C80 strength class according to claim 3, wherein: the mass ratio of the fly ash to the granulated blast furnace slag powder is (1-2) to 1.
5. The high performance concrete of C80 strength class according to claim 1, wherein: the portland cement is P.O52.5R-grade portland cement, the sand is limestone or dolomite machine-made sand with the fineness modulus of 2.5-3.1, and the crushed stone is continuous graded limestone or dolomite machine-made crushed stone with the particle size of 5-20 mm.
6. The method for preparing high-performance concrete with the strength grade of C80 according to any one of claims 1-5, wherein the method comprises the following steps: the method comprises the following steps:
the method comprises the following steps: preparing a filler;
step two: the silicate cement, the sand and the broken stone are uniformly mixed, and water, silica powder, mineral admixture, filler and polycarboxylic acid high-efficiency water reducing agent are added while stirring.
7. The high performance concrete of C80 strength class according to claim 6, wherein: the preparation of the filler comprises the following steps:
step 1: dissolving polyvinyl alcohol resin and a defoaming agent in water at the temperature of 20-30 ℃, slowly stirring to fully swell the polyvinyl alcohol resin, heating to 80 ℃ at the temperature rising rate of 2-3 ℃ while stirring to accelerate the dissolution of the polyvinyl alcohol resin, and preserving heat for 1-2 hours to prepare a polyvinyl alcohol resin solution;
step 2: sequentially adding starch and fumed silica into the polyvinyl alcohol resin solution while stirring to obtain a suspension, and evaporating the suspension to remove water to obtain a semi-finished product;
and step 3: uniformly mixing the semi-finished product prepared in the step three with zeolite powder, and then extruding and granulating in an extruder to prepare filler particles;
and 4, step 4: and crushing the filler particles to obtain the filler.
8. The high performance concrete of claim 7, in a strength grade of C80, wherein: in the step 2, the drying is carried out at the temperature of 70-85 ℃ for 30-40 min.
9. The high performance concrete of claim 7, in a strength grade of C80, wherein: in step 4, the filler particles are pulverized to 10 μm or less.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117585950A (en) * | 2024-01-17 | 2024-02-23 | 廊坊恒德新材料有限公司 | Dolomite powder concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008090481A2 (en) * | 2007-01-24 | 2008-07-31 | Lafarge | New concrete compositions |
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| WO2008090481A2 (en) * | 2007-01-24 | 2008-07-31 | Lafarge | New concrete compositions |
| CN102503260A (en) * | 2011-10-18 | 2012-06-20 | 合肥天柱包河特种混凝土有限公司 | Concrete |
| CN105294141A (en) * | 2014-07-29 | 2016-02-03 | 金承黎 | Nano porous concrete taking thixotropic colloid as template agent and preparation method |
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| CN117585950A (en) * | 2024-01-17 | 2024-02-23 | 廊坊恒德新材料有限公司 | Dolomite powder concrete and preparation method thereof |
| CN117585950B (en) * | 2024-01-17 | 2024-03-26 | 廊坊恒德新材料有限公司 | Dolomite powder concrete and preparation method thereof |
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| CN112142405B (en) | 2022-03-29 |
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