CN113004009A - Environment-friendly high-strength concrete and preparation method thereof - Google Patents
Environment-friendly high-strength concrete and preparation method thereof Download PDFInfo
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- CN113004009A CN113004009A CN202110444969.8A CN202110444969A CN113004009A CN 113004009 A CN113004009 A CN 113004009A CN 202110444969 A CN202110444969 A CN 202110444969A CN 113004009 A CN113004009 A CN 113004009A
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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
- 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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Abstract
The application relates to the field of environment-friendly concrete, and particularly discloses environment-friendly high-strength concrete and a preparation method thereof. The environment-friendly high-strength concrete comprises the following components in parts by weight: cement 300-; 100 portions and 150 portions of fly ash; 500 portions of sand and 600 portions of sand; 700 portions of fine stone and 800 portions of fine stone; 100 portions of water and 150 portions of water; 3-5 parts of a water reducing agent; 3-5 parts of a reinforcing agent; 400 portions of modified recycled aggregate and 600 portions of modified recycled aggregate; the modified recycled aggregate is prepared by mixing, drying and crushing recycled aggregate and coating liquid. The application discloses environment-friendly high-strength concrete makes it have green simultaneously, advantage that intensity is high through carrying out recycle to abandonment concrete and abandonment fragment of brick, deuterogamies special processing technology.
Description
Technical Field
The application relates to the technical field of environment-friendly concrete, in particular to environment-friendly high-strength concrete and a preparation method thereof.
Background
In today's infrastructure, cement concrete is one of the most important building materials in today's world. However, with the popularization and use of the material, a large amount of solid waste generated by old buildings is removed, which not only causes environmental pollution, but also causes resource waste. The solid waste generated by demolishing buildings in China is more than 2 hundred million tons every year, and most of the solid waste is waste concrete and waste bricks. And the production of concrete requires a large amount of mine resources such as natural sand, stone and the like, and the mine resources are used as nonrenewable resources and need to be protected. Therefore, the development and utilization of construction wastes such as waste concrete, waste bricks and the like have obvious environmental benefit and economic benefit, wherein the environment-friendly concrete containing recycled aggregate is taken as an example.
The environment-friendly concrete in the related art comprises aggregate, recycled aggregate and cement paste, wherein sand and stone play a role of a skeleton in the concrete and are called as the aggregate; the waste concrete and the waste brick blocks also play a supporting role after being crushed, and are called as recycled aggregate; the cement and water form cement paste, and the cement paste wraps the surfaces of the aggregate and the recycled aggregate and fills gaps of the aggregate and the recycled aggregate. Before hardening, the cement slurry plays a role in lubrication, the mixture is endowed with certain workability, construction is convenient, and after the cement slurry is hardened, the aggregate and the recycled aggregate are cemented into a solid whole. But the recycled aggregate which is only crushed and recycled has rough surface, multiple edges and corners, large specific surface area and large water absorption capacity, and the strength and the elastic modulus of the recycled aggregate concrete are equivalent to 2/3 of natural aggregate concrete, so the strength of the environment-friendly concrete is lower.
Disclosure of Invention
In order to improve the strength of environment-friendly concrete, the application provides environment-friendly high-strength concrete and a preparation method thereof.
In a first aspect, the present application provides an environment-friendly high-strength concrete, which adopts the following technical scheme:
the environment-friendly high-strength concrete comprises the following components in parts by weight:
cement 300-;
100 portions and 150 portions of fly ash;
500 portions of sand and 600 portions of sand;
700 portions of fine stone and 800 portions of fine stone;
100 portions of water and 150 portions of water;
3-5 parts of a water reducing agent;
3-5 parts of a reinforcing agent;
400 portions of modified recycled aggregate and 600 portions of modified recycled aggregate;
the modified recycled aggregate is obtained by the following preparation steps:
a. cutting waste tires into pieces, putting the waste tires into a ball mill for ball milling, and grinding the waste tires to 50-60 meshes to obtain rubber powder;
b. mixing polyurethane and the rubber powder obtained in the step a according to the proportion of 1: (1.5-2.5) adding the mixture into molten asphalt with equal weight proportion, heating to 185-195 ℃, heating and stirring for 30-45min under the condition of 200-250r/min to prepare a coating liquid, adding a plasticizer according to the total weight ratio of the mixed liquid of 0.01-0.02 in the stirring process, and adding a coupling agent according to the total weight ratio of the mixed liquid of 0.02-0.05;
c. mixing the waste bricks and the waste concrete according to the proportion of 1: (2.5-3.5) putting the mixture into a sand crusher to be ground to prepare crushed powder with the particle size of less than 25mm for later use;
d. c, putting the crushed powder prepared in the step c into an acidic aqueous solution, soaking for 4-6h, taking out and drying for later use, wherein the ph of the acidic aqueous solution is 2.5-4.5;
e. calcining the dried crushed powder at 1100-1200 ℃ for 3-5h, filling nitrogen, cooling to room temperature, putting into a ball mill, grinding and screening to obtain a calcined product with the particle size of 5-15mm as a recycled aggregate;
f. mixing the recycled aggregate prepared in the step e, the coating liquid prepared in the step b and the porous material according to the weight ratio of 1: (1.0-1.5): (0.1-0.2), mixing at high speed for 5-10min under the condition of 2500-.
By adopting the technical scheme, the modified recycled aggregate is added into the formula, so that the concrete still has the characteristic of high strength while being environment-friendly and energy-saving, after the waste concrete and the waste brick are subjected to the preparation processes of crushing, pickling, calcining, coating and the like, surface impurities are removed, the alkalinity is reduced, a compact porous structure is formed and is tightly combined with the coating liquid, the coating liquid is prepared by mixing polyurethane, rubber powder prepared from waste tires and asphalt, the elastic modulus and the compressive strength are high, the strength of the modified recycled aggregate is greatly increased, and the porous material is adhered to the surface of the coating liquid, so that the cement can be tightly adhered to the outer surface of the aggregate and combined with the cement after being uniformly dispersed, and the ultimate tensile value or the tensile ultimate strength of the concrete is synergistically enhanced by adding the coating liquid and the porous material.
The regenerated aggregate treated by acid washing, coating with a coating solution and the like has low alkalinity and is not easy to directly contact with cement, so that the phenomenon that silicate gel with high water absorption rate is generated around the regenerated aggregate is reduced, after the gel absorbs water and expands, a tensile stress is applied to a concrete matrix, when the tensile stress exceeds the tensile strength of the concrete, cracks are generated, more solution enters a system due to the development of the cracks, the expansion of the gel is further caused until the structure is destroyed, and the modified regenerated aggregate obtained by the preparation process ensures the ultimate tensile value or the tensile ultimate strength of the concrete.
The modified recycled aggregate is prepared by a step method, the recycled aggregate and the coating liquid are prepared step by step, and then are further stirred and mixed at a high speed to obtain the uniformly mixed modified recycled aggregate, the binding force of the recycled aggregate is enhanced by the implementation of the steps of pickling and calcining in the processing process of the recycled aggregate, the elastic modulus, the compression strength and the tensile strength of the coating liquid are increased by adding the coupling agent and the plasticizer in the production process of the coating liquid, and the ultimate tensile value or the tensile ultimate strength of the concrete can be obviously improved after the prepared modified recycled aggregate is combined with the cement.
Preferably, the dispersant in the step b is prepared from hexenyl bis stearamide and liquid paraffin in a weight ratio of 1: (0.25-0.75).
By adopting the technical scheme, the mixture of the rubber powder, the molten asphalt and the polyurethane is more dispersed by mixing the hexenyl bis stearamide with the liquid paraffin, so that the coating liquid is more uniform and stable in material and performance.
Preferably, the coupling agent in the b is prepared by mixing 3-isocyanatopropyltriethoxysilane and gamma-methacryloxypropyltrimethoxysilane in a weight ratio of 1: (0.5-1.5).
By adopting the technical scheme, the 3-isocyanatopropyl triethoxysilane and the gamma-methacryloxypropyl trimethoxysilane are mixed for use, so that the surfaces of the rubber powder and the polyurethane are subjected to coupling reaction, the rubber powder and the polyurethane treated by the coupling agent are well compatible with the molten asphalt, and the formed coating liquid has excellent performance.
Preferably, the acidic aqueous solution in d is a mixed aqueous solution of oxalic acid and hydrochloric acid in a volume ratio of 5: 1.
By adopting the technical scheme, the crushed powder is subjected to acid washing by adopting the mixed aqueous solution of oxalic acid and hydrochloric acid, so that sundries in capillary holes on the surface of the crushed powder or other sundries which may influence the bonding force are completely washed clean, the surface of the crushed powder presents a clean microporous base surface, the crushed powder is combined with the coating liquid after being prepared into the recycled aggregate subsequently, silicate gel with high water absorption rate is not easily generated around the recycled aggregate weakened by alkalinity, and the ultimate tensile value or the ultimate tensile strength of the concrete is further ensured.
Preferably, the porous material in the step f is prepared from glass wool, activated carbon and ceramic powder in a weight ratio of 1: (1-2): (1-2).
By adopting the technical scheme, the glass wool, the activated carbon and the ceramic powder are all in porous structures, and the porous material can form a better interface with concrete after being combined on the coating liquid and is more tightly and firmly combined with cement, so that the tensile strength and the crack resistance of the concrete are improved.
Preferably, the water reducing agent consists of maleopimaric anhydride and maleic anhydride type carboxylic acid water reducing agent according to the weight ratio of 0.75: 1.
Through adopting above-mentioned technical scheme, the water-reducing agent that forms by the mixture of maleic anhydride type carboxylic acid water-reducing agent of maleopimaric anhydride contains a large amount of carboxyls, can play good dispersion to cement for cement combines inseparabler with the cladding liquid in the modified aggregate outside, and through the reduction of water consumption, has improved the intensity and the life of concrete.
Preferably, the reinforcing agent is prepared from diethylene glycol, triethanolamine, sulfonate and sodium gluconate according to a weight ratio of 1: (1-1.5): (0.5-1): (0.5-1).
By adopting the technical scheme, the reinforcing agent is added in the concrete preparation process, so that the reinforcing agent can react with unhydrated cement and cement hydration byproducts such as calcium hydroxide at the initial stage of mixing to generate a large amount of dendritic calcareous stone crystals and calcareous stone crystals with a three-dimensional net structure, and the reinforcing agent is matched with the modified recycled aggregate to ensure that the concrete is more compact, and further the strength and the hardness of the concrete are greatly improved.
Preferably, the sand is natural medium sand in the area II, the fineness modulus is 2.3, and the mud content is less than 0.4 percent, and the density of the fly ash is 2.63g/cm3Fineness of 8.5%, loss on ignition of 5.0% and water demand ratio of 95.0%.
Through adopting above-mentioned technical scheme, through the mixing of II district natural middlings and fine stone, modified regeneration aggregate, pile up the overlap joint skeleton that forms closely knit packing, when the appropriate amount of fly ash of ratio mixes, can fully pack to between sand and the fine stone or adsorb on modified regeneration aggregate surface, reduce the porosity of concrete then by a wide margin, improved the crack resistance and the intensity of concrete.
In a second aspect, the present application provides a method for preparing an environment-friendly high-strength concrete, which adopts the following technical scheme: the preparation method of the environment-friendly high-strength concrete comprises the following steps:
s1, uniformly mixing the fly ash, the sand and the fine stone in corresponding parts by weight to obtain a mixture A;
s2, uniformly mixing the cement and the modified recycled aggregate in corresponding parts by weight to obtain a mixture B;
s3, dissolving a water reducing agent into water to obtain a mixture C;
and S4, uniformly mixing the mixture A and the mixture B, adding the mixture C and the reinforcing agent, and uniformly stirring and mixing to obtain the environment-friendly high-strength concrete.
By adopting the technical scheme, the mixture A, B, C is prepared respectively by adopting a step-by-step method and then is further mixed, so that the dispersibility of each component A, B, C in the environment-friendly high-strength concrete is improved, the compression resistance of the concrete is improved, the preparation method is simple, and special conditions such as heating, pressurizing and the like are not required, so that the method is suitable for large-scale industrial production.
In summary, the present application has the following beneficial effects:
1. the mechanical property of the prepared concrete is improved by adding the modified recycled aggregate, the modified recycled aggregate is green and environment-friendly, is prepared by taking building waste as a main raw material, has good elastic modulus and strength by arranging the coating liquid, can be combined with cement more tightly by matching with the use of a porous material and a reinforcing agent, and is more compact, so that the ultimate tensile value or the ultimate tensile strength of the concrete is synergistically improved;
2. the mechanical property of the concrete is further improved by adding the reinforcing agent, a large number of limestone crystals with a three-dimensional net structure are generated by reacting with unhydrated cement and cement hydration byproducts such as calcium hydroxide, and the strength and hardness of the concrete are obviously improved by matching with the use of modified recycled aggregate;
3. the concrete preparation method is simple, special conditions such as heating and pressurizing are not needed, the large-scale industrial production is suitable, and the environment-friendly high-strength concrete with good dispersity and stable performance can be obtained only by preparing the mixture A, B, C step by step and then further mixing.
Detailed Description
The present application will be described in further detail with reference to examples.
The cement in the embodiment of the application is common Portland cement;
the sand adopts natural medium sand in the area II, the fineness modulus is 2.3, the mud content is less than 0.4 percent, and the sand is used as fine aggregate;
the fine stones are crushed stones with the grain size of 5-20mm in continuous gradation as coarse aggregates;
the fly ash is collected from Xin Tuo mineral processing Limited company of Lingshu county, the density is 2.63g/cm3, the fineness is 8.5 percent, the loss on ignition is 5.0 percent, and the water demand is 95.0 percent;
the polyurethane is obtained from Kaiteng polyurethane products of Suzhou, Co.Ltd;
the asphalt is collected from Handan city Konghao trade company Limited;
the hexenyl bis stearamide is obtained from Nantong Runfeng petrochemical company Limited;
the liquid paraffin is all collected from Shanghai Xiyu chemical industry materials Co., Ltd;
3-Isocyanic acid propyl triethoxy silane is prepared from Nanjing Quanxi chemical company;
the gamma-methacryloxypropyltrimethoxysilane is obtained from the chemical company Limited of Changshan Chuangda;
the glass wool is all collected from Gallery Bell specialized chemical and building materials, Inc.;
the activated carbon is all collected from Shanghai Jun Peng environmental protection science and technology limited;
the ceramic powder is all collected from Shanghai Huizi Xiannao New Material Co Ltd;
maleic anhydride was obtained from Kjen chemical Co., Ltd of Shanghai;
the maleic anhydride type carboxylic acid water reducing agents are all obtained from Shanghai Kayin chemical Co., Ltd;
diethylene glycol was obtained from ait (Shandong) New materials, Inc.;
triethanolamine was obtained from ait (Shandong) New materials, Inc.;
the sulfonates are all obtained from Shanghai Kaiser chemical Co., Ltd;
sodium gluconate was obtained from gorgeous industrial and trade company, Suzhou;
the sand crusher is purchased from the scientific big mechanical manufacturing company Limited in the firm city;
the ball mill is purchased from Zhengzhou Haoyding mechanical equipment limited;
the heating blender was purchased from Shenyang Seiko Hua Gai machine Co.
Preparation examples of raw materials
Preparation example 1
A modified recycled aggregate is prepared by the following steps:
a. shearing waste tires into pieces, putting the waste tires into a ball mill for ball milling, and grinding and sieving the waste tires with a 50-mesh sieve to obtain rubber powder;
b. mixing polyurethane and the rubber powder obtained in the step a according to the proportion of 1: 1.5, heating to 185 ℃, heating and stirring for 30min under the condition of 200r/min to prepare a coating liquid, adding a dispersing agent according to the total weight ratio of the mixed liquid to 0.01, and adding a coupling agent according to the total weight ratio of the mixed liquid to 0.02;
the dispersant in the step b is prepared from hexenyl bis stearamide and liquid paraffin according to a weight ratio of 1: 0.25;
the coupling agent in the b is prepared from 3-isocyanatopropyl triethoxysilane and gamma-methacryloxypropyl trimethoxysilane in a weight ratio of 1: 0.5;
c. mixing the waste bricks and the waste concrete according to the proportion of 1: 2.5, putting the mixture into a sand crusher to be ground to prepare crushed powder with the particle size of less than 25mm for later use;
d. c, putting the crushed powder prepared in the step c into an acidic aqueous solution, soaking for 4 hours, taking out and drying for later use, wherein the ph of the acidic aqueous solution is 4.5;
the acidic aqueous solution in the step d is a mixed aqueous solution of oxalic acid and hydrochloric acid in a volume ratio of 5: 1;
e. calcining the dried crushed powder at 1100 ℃ for 3h, filling nitrogen, cooling to room temperature, putting into a ball mill, grinding and screening to obtain a calcined product with the particle size of 5-15mm as recycled aggregate;
f. mixing the recycled aggregate prepared in the step e, the coating liquid prepared in the step b and the porous material according to the weight ratio of 1: 1.0: mixing at a ratio of 0.1, mixing at a high speed of 2500r/min for 5min, pouring into a flat plate mold after mixing uniformly, cooling to room temperature, finally putting into a ball mill, carrying out ball milling and screening, and screening to obtain a particle size of 5-25mm to prepare a modified recycled aggregate;
the porous material in the step f is prepared from glass wool, activated carbon and ceramic powder in a weight ratio of 1: 1: 1.
Preparation example 2
A modified recycled aggregate is prepared by the following steps:
a. shearing waste tires into pieces, putting the waste tires into a ball mill for ball milling, and grinding the waste tires through a 55-mesh sieve to obtain rubber powder;
b. mixing polyurethane and the rubber powder obtained in the step a according to the proportion of 1: 2.0 weight percent of the dispersant is added into the molten asphalt with equal weight proportion, the temperature is raised to 190 ℃, the mixture is heated and stirred for 37.5min under the condition of 225r/min, so as to prepare a coating liquid, the dispersant is added according to the total weight proportion of 0.015 in the stirring process, and the coupling agent is added according to the total weight proportion of 0.035 in the stirring process;
the dispersant in the step b is prepared from hexenyl bis stearamide and liquid paraffin according to a weight ratio of 1: 0.25;
the coupling agent in the b is prepared from 3-isocyanatopropyl triethoxysilane and gamma-methacryloxypropyl trimethoxysilane in a weight ratio of 1: 0.5;
c. mixing the waste bricks and the waste concrete according to the proportion of 1: 3, putting the mixture into a sand crusher to grind to prepare crushed powder with the particle size of less than 25mm for later use;
d. c, placing the crushed powder prepared in the step c into an acidic aqueous solution, soaking for 5 hours, taking out and drying for later use, wherein the ph of the acidic aqueous solution is 3.5;
the acidic aqueous solution in the step d is a mixed aqueous solution of oxalic acid and hydrochloric acid in a volume ratio of 5: 1;
e. calcining the dried crushed powder at 1150 ℃ for 4h, filling nitrogen, cooling to room temperature, putting into a ball mill, grinding and screening to obtain a calcined product with the particle size of 5-15mm as recycled aggregate;
f. mixing the recycled aggregate prepared in the step e, the coating liquid prepared in the step b and the porous material according to the weight ratio of 1: 1.25: mixing at a ratio of 0.15, mixing at a high speed of 2750r/min for 7.5min, uniformly mixing, pouring into a flat plate mold, cooling to room temperature, finally putting into a ball mill, carrying out ball milling and screening, and screening to obtain a modified recycled aggregate with a particle size of 5-25 mm;
the porous material in the step f is prepared from glass wool, activated carbon and ceramic powder in a weight ratio of 1: 1: 1.
Preparation example 3
A modified recycled aggregate is prepared by the following steps:
a. shearing waste tires into pieces, putting the waste tires into a ball mill for ball milling, and grinding and sieving the waste tires with a 60-mesh sieve to obtain rubber powder;
b. mixing polyurethane and the rubber powder obtained in the step a according to the proportion of 1: 2.5, heating to 195 ℃, heating and stirring for 45min under the condition of 250r/min to prepare a coating liquid, adding a dispersing agent according to the total weight ratio of the mixed liquid, and adding a coupling agent according to the total weight ratio of the mixed liquid, wherein the total weight ratio of the dispersing agent is 0.02;
the dispersant in the step b is prepared from hexenyl bis stearamide and liquid paraffin according to a weight ratio of 1: 0.25;
the coupling agent in the b is prepared from 3-isocyanatopropyl triethoxysilane and gamma-methacryloxypropyl trimethoxysilane in a weight ratio of 1: 0.5;
c. mixing the waste bricks and the waste concrete according to the proportion of 1: 3.5, putting the mixture into a sand crusher to be ground to prepare crushed powder with the particle size of less than 25mm for later use;
d. c, placing the crushed powder prepared in the step c into an acidic aqueous solution, soaking for 6 hours, taking out and drying for later use, wherein the ph of the acidic aqueous solution is 2.5;
the acidic aqueous solution in the step d is a mixed aqueous solution of oxalic acid and hydrochloric acid in a volume ratio of 5: 1;
e. calcining the dried crushed powder at 1200 ℃ for 5h, filling nitrogen, cooling to room temperature, putting into a ball mill, grinding and screening to obtain a calcined product with the particle size of 5-15mm as recycled aggregate;
f. mixing the recycled aggregate prepared in the step e, the coating liquid prepared in the step b and the porous material according to the weight ratio of 1: 1.5: mixing at a ratio of 0.2, mixing at a high speed of 3000r/min for 10min, uniformly mixing, pouring into a flat plate mold, cooling to room temperature, finally putting into a ball mill, carrying out ball milling and screening, and screening to obtain a particle size of 5-25mm to obtain a modified recycled aggregate;
the porous material in the step f is prepared from glass wool, activated carbon and ceramic powder in a weight ratio of 1: 1: 1.
Preparation example 4
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the dispersant in the b is prepared by mixing hexenyl bis stearamide and liquid paraffin according to a weight ratio of 1: 0.5.
Preparation example 5
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the dispersant in the b is prepared by mixing hexenyl bis stearamide and liquid paraffin according to a weight ratio of 1: 0.75 composition.
Preparation example 6
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the coupling agent in the step b is prepared by mixing 3-isocyanatopropyltriethoxysilane and gamma-methacryloxypropyltrimethoxysilane in a weight ratio of 1: 1.
Preparation example 7
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the coupling agent in the step b is prepared by mixing 3-isocyanatopropyltriethoxysilane and gamma-methacryloxypropyltrimethoxysilane in a weight ratio of 1: 1.5.
Preparation example 8
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the porous material in the step f is prepared from glass wool, activated carbon and ceramic powder in a weight ratio of 1: 1.5: 1.5.
Preparation example 9
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the porous material in the step f is prepared from glass wool, activated carbon and ceramic powder in a weight ratio of 1: 2: 2.
Examples
Example 1
The environment-friendly high-strength concrete comprises the following components in parts by weight shown in Table 1 and is prepared by the following steps:
s1, uniformly mixing the fly ash, the sand and the fine stone in corresponding parts by weight to obtain a mixture A;
s2, uniformly mixing the cement and the modified recycled aggregate in the preparation example 1 in parts by weight to obtain a mixture B;
s3, dissolving a water reducing agent into water to obtain a mixture C, wherein the water reducing agent consists of maleopimaric anhydride and a maleic anhydride type carboxylic acid water reducing agent according to the weight ratio of 0.75: 1;
s4, uniformly mixing the mixture A and the mixture B, adding the mixture C and the reinforcing agent, and uniformly stirring and mixing to obtain the environment-friendly high-strength concrete;
the reinforcing agent is prepared from diethylene glycol, triethanolamine, sulfonate and sodium gluconate according to the weight ratio of 1: 1: 0.5: 0.5.
Examples 2 to 6
An environment-friendly high-strength concrete was different from example 1 in that each component and the corresponding weight thereof are shown in table 1.
TABLE 1 Components and weights (kg) thereof in examples 1-6
Example 7
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 2 is used in the preparation process of the environment-friendly high-strength concrete.
Example 8
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 3 is used in the preparation process of the environment-friendly high-strength concrete.
Example 9
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 4 is used in the preparation process of the environment-friendly high-strength concrete.
Example 10
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 5 is used in the preparation process of the environment-friendly high-strength concrete.
Example 11
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 6 is used in the preparation process of the environment-friendly high-strength concrete.
Example 12
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 7 is used in the preparation process of the environment-friendly high-strength concrete.
Example 13
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 8 is used in the preparation process of the environment-friendly high-strength concrete.
Example 14
An environment-friendly high-strength concrete is different from the embodiment 1 in that the modified recycled aggregate prepared in the preparation example 9 is used in the preparation process of the environment-friendly high-strength concrete.
Example 15
The environment-friendly high-strength concrete is different from the concrete in example 1 in that the reinforcing agent is prepared from diethylene glycol, triethanolamine, sulfonate and sodium gluconate according to the weight ratio of 1: 1.25: 0.75: 0.75 composition.
Example 16
The environment-friendly high-strength concrete is different from the concrete in example 1 in that the reinforcing agent is prepared from diethylene glycol, triethanolamine, sulfonate and sodium gluconate according to the weight ratio of 1: 1.5: 1: 1.
Comparative example
Comparative example 1: a concrete, which is different from example 1 in that the recycled aggregate added to the concrete is waste concrete or waste bricks which have been crushed only.
Comparative example 2: a concrete, which is different from the concrete of example 1 in that a coupling agent and a dispersing agent are not added in the preparation process b of the modified recycled aggregate.
Comparative example 3: a concrete, which differs from example 1 in that the preparation of the modified recycled aggregate does not comprise the steps d and e.
Comparative example 4: a concrete, which is different from the concrete of example 1 in that a porous material is not added in the preparation process f of the modified recycled aggregate.
Comparative example 5: a concrete, which is different from example 1 in that the reinforcing agent is a commercially available reinforcing agent and is used by being uniformly applied to the surface layer of a coagulated concrete.
Performance test
The concrete prepared in examples 1 to 16 and comparative examples 1 to 5 were used as test objects, and after curing for 28 days, the compressive strength and the splitting tensile strength were measured, and the surface of each group of samples was observed for the occurrence of cracks, and the lengths of the cracks were recorded. The test specimens were 150mm by 150mm cubic standard specimens. The compressive strength and the cleavage compressive strength were measured according to GB/T50081-2002 "method for testing mechanical Properties of ordinary concrete", and the results are shown in Table 2 below.
Table 2 results of performance testing
As can be seen from the test data in Table 2, no crack is generated in the test process in examples 1-16, the compressive strength is higher than 39MPa, and the tensile strength at splitting is higher than 3.37MPa, wherein the concrete prepared by adopting the component ratios in example 3 has the highest strength; in the example 7, the concrete adopts the modified recycled aggregate prepared by the process parameters in the preparation example 2, the effect of improving the mechanical property of the concrete is the best, and is improved by 10 percent compared with the concrete in the example 1; the concrete in the embodiment 13 adopts the porous material proportion, the effect of improving the mechanical property of the concrete is best, and is improved by 10 percent compared with the embodiment 1; the reinforcing agent used in the concrete in example 15 has the best effect of improving the mechanical properties of the concrete, and is improved by 14.5% compared with example 1.
By combining the example 1 and the comparative example 1 and combining the table 2, it can be seen that, in the comparative example 1, as the added recycled aggregate is not modified, large cracks appear, and simultaneously, the crack resistance of the concrete is greatly reduced, and the strength is reduced by 11%.
Combining example 1 and comparative example 2, and table 2, it can be seen that comparative example 2 has a 4% reduction in strength and a smaller crack occurred because the coupling agent and the dispersant were not added during the modification of the recycled aggregate.
Combining example 1 and comparative example 3, and combining table 2, it can be seen that comparative example 3 has a strength reduction of 7% and cracks occurred since steps d and e were not included in the process of modifying recycled aggregate.
Combining example 1 and comparative example 4, and combining table 2, it can be seen that comparative example 4 has a 5% reduction in strength and a smaller crack occurred because no porous material was added during the modification of recycled aggregate.
Combining example 1 and comparative example 5, and table 2, it can be seen that the surface layer of the concrete in comparative example 5 shows no cracks but 4% reduction in strength after being coated with the reinforcing agent.
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 environment-friendly high-strength concrete is characterized by comprising the following components in parts by weight:
cement 300-;
100 portions and 150 portions of fly ash;
500 portions of sand and 600 portions of sand;
700 portions of fine stone and 800 portions of fine stone;
100 portions of water and 150 portions of water;
3-5 parts of a water reducing agent;
3-5 parts of a reinforcing agent;
400 portions of modified recycled aggregate and 600 portions of modified recycled aggregate;
the modified recycled aggregate is obtained by the following preparation steps:
a. cutting waste tires into pieces, putting the waste tires into a ball mill for ball milling, and grinding the waste tires to 50-60 meshes to obtain rubber powder;
b. mixing polyurethane and the rubber powder obtained in the step a according to the proportion of 1: (1.5-2.5) adding the mixture into molten asphalt with equal weight proportion, heating to 185-195 ℃, heating and stirring for 30-45min under the condition of 200-250r/min to prepare a coating solution, adding a dispersing agent according to the total weight ratio of the mixed solution of 0.01-0.02 in the stirring process, and adding a coupling agent according to the total weight ratio of the mixed solution of 0.02-0.05;
c. mixing the waste bricks and the waste concrete according to the proportion of 1: (2.5-3.5) putting the mixture into a sand crusher to be ground to prepare crushed powder with the particle size of less than 25mm for later use;
d. c, putting the crushed powder prepared in the step c into an acidic aqueous solution, soaking for 4-6h, taking out and drying for later use, wherein the ph of the acidic aqueous solution is 2.5-4.5;
e. calcining the dried crushed powder at 1100-1200 ℃ for 3-5h, filling nitrogen, cooling to room temperature, putting into a ball mill, grinding and screening to obtain a calcined product with the particle size of 5-15mm as a recycled aggregate;
f. mixing the recycled aggregate prepared in the step e, the coating liquid prepared in the step b and the porous material according to the weight ratio of 1: (1.0-1.5): (0.1-0.2), mixing at high speed for 5-10min under the condition of 2500-.
2. The environment-friendly high-strength concrete according to claim 1, wherein the dispersant in the b is prepared from hexenyl bis stearamide and liquid paraffin in a weight ratio of 1: (0.25-0.75).
3. The environment-friendly high-strength concrete according to claim 1, wherein the coupling agent in the b is prepared from 3-isocyanatopropyltriethoxysilane and gamma-methacryloxypropyltrimethoxysilane in a weight ratio of 1: (0.5-1.5).
4. The environment-friendly high-strength concrete according to claim 1, wherein the acidic aqueous solution in d is a mixed aqueous solution of oxalic acid and hydrochloric acid in a volume ratio of 5: 1.
5. The environment-friendly high-strength concrete according to claim 1, wherein the porous material in the step f is prepared from glass wool, activated carbon and ceramic powder in a weight ratio of 1: (1-2): (1-2).
6. The environment-friendly high-strength concrete according to claim 1, wherein the water reducing agent consists of maleopimaric anhydride and a maleic anhydride type carboxylic acid water reducing agent in a weight ratio of 0.75: 1.
7. The environment-friendly high-strength concrete according to claim 1, wherein the reinforcing agent is prepared from diethylene glycol, triethanolamine, sulfonate and sodium gluconate in a weight ratio of 1: (1-1.5): (0.5-1): (0.5-1).
8. The environment-friendly high-strength concrete according to claim 1, wherein the sand is natural medium sand in a zone II, the fineness modulus is 2.3, the mud content is less than 0.4%, and the density of the fly ash is 2.63g/cm3Fineness of 8.5%, loss on ignition of 5.0% and water demand ratio of 95.0%.
9. The method for preparing environment-friendly high-strength concrete according to any one of claims 1 to 8, characterized by comprising the steps of:
s1, uniformly mixing the fly ash, the sand and the fine stone in corresponding parts by weight to obtain a mixture A;
s2, uniformly mixing the cement and the modified recycled aggregate in corresponding parts by weight to obtain a mixture B;
s3, dissolving a water reducing agent into water to obtain a mixture C;
and S4, uniformly mixing the mixture A and the mixture B, adding the mixture C and the reinforcing agent, and uniformly stirring and mixing to obtain the environment-friendly high-strength concrete.
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Application publication date: 20210622 |