CN113603429A - Preparation process of frost-resistant high-strength concrete - Google Patents
Preparation process of frost-resistant high-strength concrete Download PDFInfo
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- CN113603429A CN113603429A CN202111042211.8A CN202111042211A CN113603429A CN 113603429 A CN113603429 A CN 113603429A CN 202111042211 A CN202111042211 A CN 202111042211A CN 113603429 A CN113603429 A CN 113603429A
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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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- 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
- C04B14/08—Diatomaceous earth
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- 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
- C04B14/10—Clay
- C04B14/106—Kaolin
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- 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
- C04B14/14—Minerals of vulcanic origin
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- 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
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
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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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/10—Burned or pyrolised refuse
- C04B18/101—Burned rice husks or other burned vegetable material
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
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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
- 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
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- 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
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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
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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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
Abstract
The invention discloses a preparation process of frost-resistant high-strength concrete, and relates to the technical field of concrete. The invention discloses a preparation process of frost-resistant high-strength concrete, which comprises the following steps: adding ordinary portland cement, metakaolin, limestone powder and rice hull ash into a stirrer for dry mixing, and then adding coarse aggregate and fine aggregate for uniform mixing; adding the vinyl acetate/diatomite hydrogel and a part of air entraining water reducing agent into a mixture of fatty alcohol-polyoxyethylene ether, polydimethylsiloxane and part of water, and stirring to obtain a premix; and sequentially adding the other part of the air entraining water reducing agent, the composite expanding agent and the other part of the water into the stirrer, slowly stirring while adding the premix, and quickly stirring to obtain the required high-strength concrete. The concrete with high frost resistance and high strength provided by the invention has the advantages of simple preparation process, excellent low shrinkage, high crack resistance and durability, excellent weather resistance and prolonged service life.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to frost-resistant high-strength concrete and a preparation process thereof.
Background
The concrete is an artificial stone which is prepared by a cementing material, granular aggregate (also called aggregate), water, additive and admixture which are added if necessary according to a certain proportion, and the artificial stone is formed by uniform stirring, compact forming, curing and hardening. The concrete has the characteristics of rich raw materials, low price and simple production process, simultaneously has the characteristics of high compressive strength, good durability, wide strength grade range and the like, and is a very wide base material in the field of modern building engineering.
However, as the modern building industry is rapidly developed, the demand for concrete is higher and higher, and particularly, the demand for concrete for building and road construction in a cold environment is particularly strict. Under the great condition of the temperature difference round the clock, daytime high temperature, the moisture that freezes can take place to volatilize to will form more space in the inside of concrete, just so led to the looseness of concrete inner structure, and then just also influenced the durability of concrete. Therefore, some concrete manufacturing enterprises add the water reducing agent to reduce the water content in the concrete material in the concrete processing process, so that the frost resistance of the concrete material is improved to a certain extent, but a large amount of water reducing agent is used in the preparation process, so that the production cost of the concrete is increased invisibly, the slump of the concrete is increased easily, and certain limitation is realized. Still some technicians, through adding the air entraining agent, in the preparation process, introduce a large amount of tiny bubbles to improve the heat insulation and frost resistance of the concrete, improve the durability of the concrete, but the introduction of a large amount of gas easily leads to the lower strength of the concrete.
For this reason, the present inventors have developed a concrete containing an air-entraining agent, which maintains excellent frost resistance and has high compressive strength.
Disclosure of Invention
The invention mainly aims to provide a preparation process of high-frost-resistance and high-strength concrete, and the concrete prepared by the method also has excellent low shrinkage, high crack resistance and durability, has excellent weather resistance and prolongs the service life of the concrete.
In order to realize the aim of the invention, the invention provides a preparation process of frost-resistant high-strength concrete, which specifically comprises the following steps:
(1) adding ordinary portland cement, metakaolin, limestone powder and rice hull ash into a stirrer, dry-stirring for 3-5min, then adding coarse aggregate and fine aggregate, and uniformly mixing;
(2) adding the vinyl acetate/diatomite hydrogel and 2/3 parts by mass of air entraining water reducing agent into a mixture of fatty alcohol-polyoxyethylene ether, polydimethylsiloxane and 1/2 parts by mass of water, and stirring for 5-10min to obtain a premix;
(3) and (3) sequentially adding 1/3 parts by mass of air entraining water reducer, composite expanding agent and 1/2 parts by mass of water into the mixture prepared in the step (1), stirring for 3-5min, adding the premix prepared in the step (2) while slowly stirring, and quickly stirring for 2-3min to obtain the required high-strength concrete.
Further, the frost-resistant high-strength concrete is prepared from the following raw materials in parts by weight: 200-280 parts of ordinary portland cement, 480 parts of coarse aggregate 410, 420 parts of fine aggregate 350, 70-85 parts of metakaolin, 50-70 parts of limestone powder, 30-40 parts of rice hull powder, 8-12 parts of an air-entraining water reducing agent, 20-30 parts of a composite expanding agent, 15-20 parts of vinyl acetate/diatomite hydrogel, 20-30 parts of fatty alcohol-polyoxyethylene ether, 25-30 parts of polydimethylsiloxane and 80-100 parts of water.
Further, the strength grade of the ordinary portland cement is 42.5 grade; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
Further, the composite expanding agent is prepared by compounding ettringite and talcum powder, wherein the weight ratio of the ettringite to the talcum powder is (2-4): 1.
further, the vinyl acetate/diatomite hydrogel is a hydrogel formed by compounding vinyl acetate and diatomite.
Further, the preparation method of the vinyl acetate/diatomite hydrogel comprises the following steps: adding diatomite, N' -methylene bisacrylamide and deionized water into a reaction kettle, uniformly stirring, then adding vinyl acetate and an initiator, heating to 70-80 ℃, stirring for reaction for 3-4h, cooling, neutralizing with 1mol/L NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, then dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product.
Further, the proportion of the diatomite to the vinyl acetate is 100-150g/L, and the mass ratio of the diatomite to the N, N' -methylene bisacrylamide is 1: (0.1-0.3), the ratio of the diatomite to the deionized water is 10-15g/L, and the mass ratio of the diatomite to the initiator is 1: (0.03-0.05).
Further, the air-entraining water reducing agent is Q8113AEWR produced by Qin building materials Limited in Shanxi province.
The invention achieves the following beneficial effects:
1. a vinyl acetate/diatomite hydrogel is a cross-linked polymer which can swell in water and retain a certain amount of water, is insoluble in water and has a three-dimensional network structure, wherein the contained strongly water-absorbing groups such as carboxyl groups and hydroxyl groups can absorb liquid water tens to thousands of times of the self weight through hydration with water, and the water-absorbing groups are in a gel state, and free water can be fixed in the polymer network through swelling, so that the hydrogel has good water retention performance under pressurization and can slowly release water under a dry environment. Therefore, the vinyl acetate/diatomite hydrogel is doped into the concrete, and the chemical shrinkage of the concrete can be counteracted by controlling the moisture in the concrete, the self-shrinkage of the concrete can be effectively reduced, the early shrinkage cracking of the concrete is effectively inhibited, the durability is improved, and the service life of the concrete is further prolonged. The hydrogel contains diatomite components, has good cohesiveness, can improve the adhesive force of other components in concrete, increases the strength of the concrete, and also improves the water resistance and heat preservation of the invention.
2. According to the invention, through compounding of cement, metakaolin, limestone powder and rice husk ash, the self-shrinkage of concrete is reduced, the pore structure is refined, the fluidity of concrete is improved, and the compressive strength of the concrete is further improved.
3. The polydimethylsiloxane is added in the concrete, so that the surface energy of the concrete can be effectively reduced, the surface hydrophobicity of the concrete can be improved, and the anti-corrosion and anti-icing performances are improved, so that the concrete has excellent frost resistance and weather resistance. The polydimethylsiloxane is uniformly dispersed in the concrete under the action of the fatty alcohol-polyoxyethylene ether, and can be well combined with components such as vinyl acetate/diatomite hydrogel and the like, so that the binding force among the components in the concrete is improved, the porosity inside the concrete is reduced, the interior of the concrete is more compact, and the compressive strength of the concrete is improved.
4. According to the invention, the air entraining water reducing agent of a specific manufacturer is adopted to interact with the vinyl acetate/diatomite hydrogel, so that uniform and stable micro bubbles which are not easy to damage are generated in the concrete, the micro bubbles are easy to fill in pores in the components such as diatomite and the like, and the frost resistance of the concrete is further improved; the vinyl acetate/diatomite hydrogel has better dispersibility under the action of the polydimethylsiloxane and the fatty alcohol-polyoxyethylene ether, so that micro bubbles in concrete are uniformly mixed and are not easy to break, the surface tension of the concrete is reduced, the workability of the concrete is improved, bleeding and segregation are reduced, the shrinkage performance of the concrete is improved, the slump of the concrete is reduced, the impermeability, the freezing resistance and the weather resistance of the concrete are improved, and the compressive strength and the durability of the concrete are further improved.
5. The invention adopts the coarse aggregate and the fine aggregate with proper grain diameter and proportion, effectively reduces the self-shrinkage of the concrete, reduces the porosity inside the concrete, makes the inside of the concrete more compact, further reduces the cracks inside the concrete, and improves the crack resistance, seepage resistance and compressive strength of the concrete.
6. The invention adopts the mutual matching of the composite expanding agent, the air entraining water reducing agent, the vinyl acetate/diatomite hydrogel and the polydimethylsiloxane, on one hand, the invention is used for improving the rheological property of the concrete, reducing the phenomena of bleeding and segregation and further improving the workability of the concrete; on the other hand, the shrinkage and frost resistance of the concrete are also further improved.
7. The anti-freezing high-strength concrete has the advantages of simple preparation method, good mechanical property, heat preservation, aging resistance, low shrinkage, crack resistance and seepage resistance, easy maintenance and wide application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The metakaolin adopted by the invention is provided by Guishou county Jiashuo building materials processing Co., Ltd; the limestone powder is provided by Yongman lime plant in east Bao area of Jingmen; the rice hull ash is provided by Shijiazhuang Song agricultural planting Co., Ltd; the polycarboxylic acid water reducing agent is provided by Shandong bock chemical company Limited; the air-entraining water reducing agent is Q8113AEWR produced by Qin building materials Limited company in Shaanxi province.
Example 1
A preparation method of frost-resistant high-strength concrete comprises the following steps:
(1) weighing 20kg of ordinary portland cement, 8.5kg of metakaolin, 7kg of limestone powder and 4kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing and mixing, wherein the stirring time is 5min, and then sequentially adding 41kg of coarse aggregate and 35kg of fine aggregate, the stirring time is 5min, and the stirring speed is 600rpm, so as to obtain a dry material mixture;
(2) stirring 2kg of fatty alcohol-polyoxyethylene ether, 2.5kg of polydimethylsiloxane and 4kg of water for 3min at the stirring speed of 500rpm, then adding the mixture into a mixture of 2kg of vinyl acetate/diatomite hydrogel and 0.53kg of air-entraining water reducing agent, stirring at the stirring speed of 1000rpm for 10min, and obtaining a premix;
(3) adding 0.27kg of air entraining water reducing agent, 3kg of composite expanding agent and 4kg of water into a concrete stirrer in sequence, stirring for 5min at the speed of 500rpm, adjusting the stirring speed to 200rpm, adding the premix while stirring, adjusting the stirring speed to 1200rpm, stirring for 3min, and then discharging to obtain the finished high-strength concrete.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared from 3: 1, and talcum powder.
The vinyl acetate/diatomite hydrogel in this example is a hydrogel formed by compounding vinyl acetate and diatomite, and the preparation method thereof is as follows: adding 1.5kg of diatomite, 450g of N, N' -methylene bisacrylamide and 100L of deionized water into a reaction kettle, uniformly stirring, then adding 10L of vinyl acetate and 75g of initiator, heating to 80 ℃, stirring for reaction for 4 hours, cooling, neutralizing with 1mol/L of NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product. The initiator is ammonium persulfate and sodium sulfite, and the mass ratio is 2: 1.
example 2
A preparation method of frost-resistant high-strength concrete comprises the following steps:
(1) weighing 28kg of ordinary portland cement, 7kg of metakaolin, 5kg of limestone powder and 3kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing for 5min, then sequentially adding 48kg of coarse aggregate and 42kg of fine aggregate, stirring for 5min at the stirring speed of 600rpm, and obtaining a dry material mixture;
(2) stirring 3kg of fatty alcohol-polyoxyethylene ether, 3kg of polydimethylsiloxane and 5kg of water for 3min at the stirring speed of 500rpm, then adding the mixture into a mixture of 1.5kg of vinyl acetate/diatomite hydrogel and 0.8kg of air-entraining water reducing agent, stirring at the stirring speed of 1000rpm for 10min, and obtaining a premix;
(3) adding 0.4kg of air entraining water reducing agent, 2kg of composite expanding agent and 5kg of water into a concrete stirrer in sequence, stirring for 5min at the speed of 500rpm, adjusting the stirring speed to 200rpm, adding the premix while stirring, adjusting the stirring speed to 1200rpm, stirring for 3min, and then discharging to obtain the finished high-strength concrete.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared by mixing, by mass, 2: 1, and talcum powder.
The vinyl acetate/diatomite hydrogel in this example is a hydrogel formed by compounding vinyl acetate and diatomite, and the preparation method thereof is as follows: adding 1kg of diatomite, 100g of N, N' -methylene bisacrylamide and 100L of deionized water into a reaction kettle, uniformly stirring, then adding 10L of vinyl acetate and 30g of initiator, heating to 80 ℃, stirring for reaction for 4 hours, cooling, neutralizing with 1mol/L of NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product. The initiator is ammonium persulfate and sodium sulfite, and the mass ratio is 2: 1.
example 3
A preparation method of frost-resistant high-strength concrete comprises the following steps:
(1) weighing 25kg of ordinary portland cement, 7kg of metakaolin, 7kg of limestone powder and 3kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing for 5min, then sequentially adding 45kg of coarse aggregate and 40kg of fine aggregate, stirring for 5min at the stirring speed of 600rpm, and obtaining a dry material mixture;
(2) stirring 2.5kg of fatty alcohol-polyoxyethylene ether, 2.5kg of polydimethylsiloxane and 4.5kg of water for 3min at the stirring speed of 500rpm, then adding the mixture into a mixture of 2kg of vinyl acetate/diatomite hydrogel and 0.66kg of air-entraining water reducing agent, stirring at the stirring speed of 1000rpm for 10min, and obtaining a premix;
(3) 0.34kg of air entraining water reducer, 2.5kg of composite expanding agent and 4.5kg of water are sequentially added into a concrete stirrer, the mixture is stirred for 5min at the speed of 500rpm, the stirring speed is adjusted to 200rpm, the premix is added while stirring, the stirring speed is adjusted to 1200rpm, the mixture is stirred for 3min, and then the discharging is carried out, so that the finished high-strength concrete is obtained.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared from 4: 1, and talcum powder.
The vinyl acetate/diatomite hydrogel in this example is a hydrogel formed by compounding vinyl acetate and diatomite, and the preparation method thereof is as follows: adding 1.25kg of diatomite, 300g of N, N' -methylene bisacrylamide and 125L of deionized water into a reaction kettle, uniformly stirring, then adding 10L of vinyl acetate and 55g of initiator, heating to 80 ℃, stirring for reaction for 4 hours, cooling, neutralizing with 1mol/L of NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product. The initiator is ammonium persulfate and sodium sulfite, and the mass ratio is 2: 1.
example 4
A preparation method of frost-resistant high-strength concrete comprises the following steps:
(1) weighing 25kg of ordinary portland cement, 8kg of metakaolin, 6kg of limestone powder and 4kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing for 5min, then sequentially adding 45kg of coarse aggregate and 35kg of fine aggregate, stirring for 5min at the stirring speed of 600rpm, and obtaining a dry material mixture;
(2) stirring 2.5kg of fatty alcohol-polyoxyethylene ether, 2.5kg of polydimethylsiloxane and 4.5kg of water for 3min at the stirring speed of 500rpm, then adding the mixture into a mixture of 2kg of vinyl acetate/diatomite hydrogel and 0.66kg of air-entraining water reducing agent, stirring at the stirring speed of 1000rpm for 10min, and obtaining a premix;
(3) and sequentially adding 0.34kg of air entraining water reducer, 2kg of composite expanding agent and 4.5kg of water into a concrete stirrer, stirring at the speed of 500rpm for 5min, adjusting the stirring speed to 200rpm, adding the premix while stirring, adjusting the stirring speed to 1200rpm, stirring for 3min, and then discharging to obtain the finished high-strength concrete.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared from 3: 1, and talcum powder.
The vinyl acetate/diatomaceous earth hydrogel in this example was the same as in example 3, with specific reference to example 3.
Comparative example 1
The raw material composition, formulation and preparation method of the concrete of comparative example 1 were the same as those of example 4, except that the vinyl acetate/diatomaceous earth hydrogel was not added in comparative example 1.
Comparative example 2
The raw material components, the proportion and the preparation method of the concrete of the comparative example 2 are the same as those of the concrete of the example 4, except that the vinyl acetate/diatomite hydrogel is not added in the comparative example 2, and the water reducing agent is a polycarboxylic acid water reducing agent.
Comparative example 3
The raw material components, the proportion and the preparation method of the concrete in the comparative example 3 are the same as those in the example 4, except that no fatty alcohol-polyoxyethylene ether or polydimethylsiloxane is added in the comparative example 3.
Comparative example 4
The raw material components, the ratio and the preparation method of the concrete of comparative example 4 were the same as those of example 4, except that no fatty alcohol-polyoxyethylene ether, polydimethylsiloxane or vinyl acetate/diatomite hydrogel was added in comparative example 4.
The concrete prepared according to examples 1 to 4 and comparative examples 1 to 4 were tested for compression strength, flexural strength, shrinkage 30d, freezing resistance, sulfate resistance 30d (5% sodium sulfate), etc., and the results are shown in Table 1 below.
TABLE 1 test results of various properties of concrete
The test results in table 1 show that the shrinkage of the concrete can be reduced and the compressive strength, frost resistance and salt resistance of the concrete can be improved by adding the vinyl acetate or diatomite hydrogel and the fatty alcohol-polyoxyethylene ether or polydimethylsiloxane, but the compressive strength and frost resistance of the concrete can be obviously improved by combining the vinyl acetate or diatomite hydrogel and the fatty alcohol-polyoxyethylene ether or polydimethylsiloxane, the durability of the concrete can be improved, and the service life of the concrete can be prolonged.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. A preparation process of frost-resistant high-strength concrete is characterized by comprising the following steps:
(1) adding ordinary portland cement, metakaolin, limestone powder and rice hull ash into a stirrer, dry-stirring for 3-5min, then adding coarse aggregate and fine aggregate, and uniformly mixing;
(2) adding the vinyl acetate/diatomite hydrogel and 2/3 parts by mass of air entraining water reducing agent into a mixture of fatty alcohol-polyoxyethylene ether, polydimethylsiloxane and 1/2 parts by mass of water, and stirring for 5-10min to obtain a premix;
(3) and (3) sequentially adding 1/3 parts by mass of air entraining water reducer, composite expanding agent and 1/2 parts by mass of water into the mixture prepared in the step (1), stirring for 3-5min, adding the premix prepared in the step (2) while slowly stirring, and quickly stirring for 2-3min to obtain the required high-strength concrete.
2. The process for preparing frost-resistant high-strength concrete according to claim 1, wherein the frost-resistant high-strength concrete is prepared from the following raw materials in parts by weight: 200-280 parts of ordinary portland cement, 480 parts of coarse aggregate 410, 420 parts of fine aggregate 350, 70-85 parts of metakaolin, 50-70 parts of limestone powder, 30-40 parts of rice hull powder, 8-12 parts of an air-entraining water reducing agent, 20-30 parts of a composite expanding agent, 15-20 parts of vinyl acetate/diatomite hydrogel, 20-30 parts of fatty alcohol-polyoxyethylene ether, 25-30 parts of polydimethylsiloxane and 80-100 parts of water.
3. The process for preparing frost resistant, high strength concrete according to claim 1 wherein said Portland cement has a strength rating of 42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
4. The preparation process of the frost-resistant high-strength concrete according to claim 1, wherein the composite expanding agent is prepared by compounding ettringite and talcum powder, and the mass ratio of the ettringite to the talcum powder is (2-4): 1.
5. the process for preparing frost-resistant, high-strength concrete according to claim 1, wherein said vinyl acetate/diatomaceous earth hydrogel is a hydrogel obtained by combining vinyl acetate and diatomaceous earth.
6. The process for preparing frost-resistant, high-strength concrete according to claim 5, wherein said vinyl acetate/diatomaceous earth hydrogel is prepared by: adding diatomite, N' -methylene bisacrylamide and deionized water into a reaction kettle, uniformly stirring, then adding vinyl acetate and an initiator, heating to 70-80 ℃, stirring for reaction for 3-4h, cooling, neutralizing with 1mol/L NaOH solution until the neutralization degree is 90%, removing the solvent, dehydrating with ethanol, and drying to obtain the catalyst.
7. The concrete as claimed in claim 6, wherein the ratio of the diatomite to the vinyl acetate is 100-150g/L, and the mass ratio of the diatomite to the N, N' -methylenebisacrylamide is 1: (0.1-0.3), the ratio of the diatomite to the deionized water is 10-15g/L, and the mass ratio of the diatomite to the initiator is 1: (0.03-0.05).
8. The process for preparing frost-resistant high-strength concrete according to claim 1, wherein the air-entraining water reducer is Q8113AEWR produced by qin, shanxi, architecture materials ltd.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113979710A (en) * | 2021-12-10 | 2022-01-28 | 黑龙江省公路建设中心 | Anti-corrosion concrete suitable for alpine regions and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113979710A (en) * | 2021-12-10 | 2022-01-28 | 黑龙江省公路建设中心 | Anti-corrosion concrete suitable for alpine regions and preparation method thereof |
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