CN113185219A - Environment-friendly anti-cracking concrete and preparation method thereof - Google Patents
Environment-friendly anti-cracking concrete and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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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- 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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- 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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
- C04B20/04—Heat treatment
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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
- 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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1074—Silicates, e.g. glass
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application relates to the field of environment-friendly concrete, and particularly discloses environment-friendly anti-cracking concrete and a preparation method thereof. The environment-friendly anti-crack concrete comprises the following components in parts by weight: cement of 280 and 300 portions; 100 portions of fly ash and 120 portions of fly ash; 500 portions and 550 portions of sand; 600 portions of fine stone and 700 portions of fine stone; 100 portions of water and 150 portions of water; 2-5 parts of a water reducing agent; 2-5 parts of a reinforcing agent; 500 portions and 600 portions of modified recycled aggregate; the modified recycled aggregate is prepared by processing waste concrete blocks through the processes of crushing, acid washing, calcining, modifying and the like. The environment-friendly anti-cracking concrete has the advantages of environmental friendliness and excellent anti-cracking performance by recycling the waste concrete and matching with a special modification treatment process.
Description
Technical Field
The application relates to the technical field of environment-friendly concrete, in particular to environment-friendly anti-cracking 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, the solid wastes generated by demolishing buildings in China are more than 2 hundred million tons every year, most of the solid wastes generated by demolishing old buildings abandon concrete, which not only causes environmental pollution, but also causes resource waste, and mine resources such as natural sand, stone and the like required by producing concrete are non-renewable resources. Therefore, the development and utilization of the waste concrete 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 crushed waste concrete also plays a role of a skeleton and is 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. After the cement paste is hardened, the aggregate and the recycled aggregate are cemented into a solid whole. However, the waste concrete after being crushed is alkaline, so that the waste concrete is easy to react with components such as portland cement in the concrete through an alkali-aggregate reaction, namely alkaline substances such as potassium hydroxide or sodium hydroxide precipitated by the cement react with metastable silicon dioxide in the aggregate, a high-water-absorption silicate gel is generated around the aggregate, the gel absorbs water to expand, a tensile stress is applied to a concrete matrix, when the tensile stress exceeds the tensile strength of the concrete, cracks are generated, and the development of the cracks enables more solution to enter the system, so that the gel further expands and the concrete structure is damaged, and the crack resistance of the concrete is greatly reduced.
Disclosure of Invention
In order to improve the crack resistance of environment-friendly concrete, the application provides the environment-friendly crack resistant concrete.
In a first aspect, the present application provides an environment-friendly anti-crack concrete, which adopts the following technical scheme:
cement of 280 and 300 portions;
100 portions of fly ash and 120 portions of fly ash;
500 portions and 550 portions of sand;
600 portions of fine stone and 700 portions of fine stone;
100 portions of water and 150 portions of water;
2-5 parts of a water reducing agent;
2-5 parts of a reinforcing agent;
500 portions and 600 portions of modified recycled aggregate;
the modified recycled aggregate is obtained by the following preparation steps:
a. firstly, heating the waste concrete blocks to 1000-1200 ℃, rapidly cooling the waste concrete blocks to room temperature by water, and then putting the waste concrete blocks into a sand crusher for grinding to prepare crushed powder with the particle size of less than 30mm for later use;
b. b, putting the crushed powder prepared in the step a into the modification solution, soaking for 4-6 days, taking out and drying to prepare modified crushed powder for later use;
a pickling agent is added into the modification solution, and the ph of the modification solution is 2.5-4.5;
the modifying solution is an aqueous solution consisting of one or more of silicon dioxide colloid, chitosan and calcium carbonate;
c. b, putting the modified crushed powder obtained in the step b into a ball mill, carrying out secondary grinding and crushing, and screening the modified crushed powder with the particle size of 10-25mm as primary recycled aggregate;
d. calcining the primary recycled aggregate obtained in the step c at 1300-1500 ℃ for 3-5h, continuously adding modified powder according to 0.05-0.10 of the weight ratio of the primary recycled aggregate in the calcining process, introducing nitrogen to cool to room temperature after calcining, and taking a calcined product with the particle size of 10-25mm as secondary recycled aggregate;
the modified powder is composed of one or more of volcanic rock, acid clay and silica fume;
e. and (d) putting the secondary recycled aggregate obtained in the step (d) into the modification liquid again, mixing for 30-60min under the conditions of temperature of 120-150 ℃ and temperature of 600-1000r/min, adding a porous material in the mixing process according to the weight ratio of 0.10-0.15 of the secondary recycled aggregate, taking out and drying to obtain the modified recycled aggregate.
By adopting the technical scheme, the modified recycled aggregate is added into the formula, so that the concrete has the advantages of environmental protection and energy saving and high anti-cracking strength, the alkalinity of the waste concrete is neutralized after the waste concrete is subjected to the preparation processes of crushing, pickling, calcining, modifying and the like, surface impurities are removed, and a compact porous structure is formed, so that the waste concrete can be tightly combined with a modifying liquid and a porous material in the modifying process, the modifying liquid is prepared by mixing silica colloid, calcium carbonate solution and the like, the alkali-aggregate reaction can be slowed down, the waste concrete can be tightly adhered to the outer surface of the modified recycled aggregate and combined with cement when being matched with the porous material for use, the bonding force between the modified recycled aggregate and the cement is further increased, the direct contact between the modified recycled aggregate and the cement is reduced, and the anti-cracking strength of the concrete is synergistically enhanced.
Preferably, the acid pickling agent in the step b is prepared from oxalic acid and hydrochloric acid in a volume ratio of 1: (0.3-0.5).
Through adopting above-mentioned technical scheme, the pickling agent cooperation modification liquid that adopts oxalic acid and hydrochloric acid mixture to make carries out the pickling, soaks the back to the shredded powder, and when the shredded powder itself basicity was neutralized, the debris that the shredded powder surface influences the adhesive force all can be by the sanitization, makes the shredded powder surface demonstrate clean many micropores base face then, is favorable to the modified combination of shredded powder and modification liquid.
Preferably, the modifying solution in the step b is prepared from water, silica colloid, chitosan, calcium carbonate and a solvent prepared from the following components in a weight ratio of 1: (0.2-0.3): (0.05-0.08): (0.1-0.15).
By adopting the technical scheme, the crushed powder is put into the modification liquid for pretreatment, the water absorption of the crushed powder can be reduced under the action of the silicon dioxide, the silicon dioxide colloid can be filled between the capillary pores of the modified recycled aggregate and the cement particles and can be firstly subjected to chemical reaction with the calcium hydroxide in the modified recycled aggregate to generate CSH gel, so that the microstructure of the concrete is improved, when the modified recycled aggregate is used in combination with the chitosan, the modified recycled aggregate can be further permeated into smaller gaps in the modified recycled aggregate, and a stable bonding layer is formed between the modified recycled aggregate and the cement in an interface transition region, so that the direct contact between the modified recycled aggregate and the cement is reduced.
Preferably, the modified powder in the step d is prepared from micro silicon powder, acid clay and volcanic rock according to the weight ratio of 1 (0.3-0.5): (0.2-0.3).
By adopting the technical scheme, the silica fume, the acid clay and the vesuvianite can be firmly combined in compact porous holes on the primary recycled aggregate in the calcining process, a better contact interface is formed between the modified recycled aggregate and the cement, the binding force between the modified recycled aggregate and the cement is enhanced, and the alkali-aggregate reaction is reduced.
Preferably, the porous material in the step e is prepared from ceramic powder, activated carbon and wood fiber according to a weight ratio of 1: (0.8-1.0): (0.8-1.0).
By adopting the technical scheme, the ceramic powder, the wood fiber, the activated carbon and the like with porous structures can be tightly combined on the surface of the modified recycled aggregate to form the buffer coating layer, the modified recycled aggregate is not easy to directly contact with cement, so that the alkali-aggregate reaction is reduced, and the crack resistance of the concrete is improved.
Preferably, the water reducing agent is prepared from calcium lignosulfonate, sodium methallyl sulfonate and volcanic ash in a weight ratio of 1: (0.5-1): (0.5-1).
By adopting the technical scheme, the water reducing agent formed by mixing the calcium lignosulphonate, the sodium methallyl sulfonate and the volcanic ash contains a large amount of hydrophilic functional groups, can form a stable solvated water film on the surface of cement, reduces direct diameter contact of cement particles, can play a good dispersing role on the cement, and further improves the strength and the service life of the concrete.
Preferably, the reinforcing agent is prepared from triethanolamine, sodium gluconate, sodium citrate and sodium methallyl sulfonate according to the weight ratio of 1: (0.2-0.3): (0.1-0.2): (0.02-0.03).
By adopting the technical scheme, the reinforcing agent formed by mixing triethanolamine, sodium gluconate, sodium citrate and sodium methallyl sulfonate can react with calcium hydroxide and the like in unhydrated cement at the initial preparation stage of concrete to generate a large amount of three-dimensional reticular limestone crystals, so that the strength and hardness of the concrete are greatly improved.
Preferably, the sand is natural medium sand in the area II, the fineness modulus is 2.6, the mud content is less than 0.6%, and the fine stones are crushed stones with the grain size of 5-20mm in continuous gradation.
By adopting the technical scheme, natural medium sand, fine stone and modified recycled aggregate in the area II can be stacked to form a densely filled lap joint framework, the porosity of the concrete is greatly reduced, and then the crack resistance and the strength of the concrete are improved.
In a second aspect, the application provides a preparation method of an environment-friendly anti-cracking concrete, which adopts the following technical scheme: the preparation method of the environment-friendly anti-crack 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, the modified recycled aggregate and the reinforcing agent 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 uniformly stirring and mixing to obtain the environment-friendly anti-crack concrete.
By adopting the technical scheme, the mixture A, B, C is prepared by a step-by-step method, the steps are simpler, special conditions such as heating and pressurizing are not needed, the method is suitable for large-scale industrial production, and A, B, C components have good dispersibility in environment-friendly anti-crack concrete, so that the concrete prepared by the preparation method has excellent anti-crack performance.
In summary, the present application has the following beneficial effects:
1. according to the method, the anti-cracking performance of the prepared environment-friendly concrete is improved by adding the modified recycled aggregate, the modified recycled aggregate is environment-friendly, and the modified recycled aggregate is prepared from waste concrete through crushing, pickling, calcining and modifying, so that the concrete is more compact while alkali-aggregate reaction is not easy to occur, and the anti-cracking performance of the concrete is improved;
2. according to the application, the crack resistance of concrete is further improved by adding the porous material, and the ceramic powder, the wood fiber, the activated carbon and the like with the porous structure can form a buffer coating layer on the surface of the modified recycled aggregate, so that the direct contact between the modified recycled aggregate and cement is reduced, and the occurrence of alkali-aggregate reaction is reduced;
3. the concrete preparation method is convenient to operate, simple in preparation process, free of special conditions such as heating and pressurizing, suitable for large-scale industrial production, and capable of obtaining the environment-friendly anti-crack concrete with good dispersity and stable performance 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 2.6, the mud content is less than 0.6 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 2.65g/cm3, the fineness is 8.0 percent, the ignition loss is 4.5 percent, and the water demand is 95.5 percent;
the sand crusher is purchased from the scientific big mechanical manufacturing company Limited in the firm city;
the silica gel is obtained from Dongguan funing new material Co.Ltd;
chitosan was collected from Shenzhen Lefu Biotech, Inc.;
the volcanic rocks are all collected from mineral processing factories in Shuochuan county, Lingshu county;
the acid clay is collected from processing plants of Longjin mineral products in Lingshou county;
the micro silicon powder is obtained from the Stone navigation building materials Co., Ltd, Lingshu county;
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;
the wood fiber is obtained from Guishou county Jiashuo building materials processing Co., Ltd;
calcium lignosulfonate was obtained from Jinan Shuihi chemical Co., Ltd;
the sodium methallyl sulfonate is all collected from Shanghai Kaiser chemical Co., Ltd;
volcanic ash was collected from Huizhou city Xing electronic materials, Inc.;
triethanolamine was obtained from ait (Shandong) New materials, Inc.;
the sodium citrate is obtained from Shandong Nuanju biological science and technology limited;
sodium gluconate was obtained from gorgeous industrial and trade company, Suzhou;
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. firstly, heating the waste concrete blocks to 1000 ℃, rapidly cooling the waste concrete blocks to room temperature by water, and then putting the waste concrete blocks into a sand crusher for grinding to prepare crushed powder with the particle size of less than 30mm for later use;
b. b, putting the crushed powder prepared in the step a into a modification solution, soaking for 4 days, taking out and drying to prepare modified crushed powder for later use;
the modifying solution is added with a pickling agent, and the pickling agent is prepared from oxalic acid and hydrochloric acid in a volume ratio of 1: 0.3, and the ph of the modifying liquid is 4.5;
the modified liquid is prepared from water, silicon dioxide colloid, chitosan, calcium carbonate and a solvent according to the weight ratio of 1: 0.2: 0.05: 0.1;
c. b, putting the modified crushed powder obtained in the step b into a ball mill, carrying out secondary grinding and crushing, and screening the modified crushed powder with the particle size of 10-25mm as primary recycled aggregate;
d. calcining the primary recycled aggregate obtained in the step c at 1300 ℃ for 3h, continuously adding modified powder in the calcining process according to 0.05 of the weight ratio of the primary recycled aggregate, introducing nitrogen after calcining and sintering, cooling to room temperature, and taking a calcined product with the particle size of 10-25mm as a secondary recycled aggregate;
the modified powder is prepared from micro silicon powder, acid clay and volcanic soil in a weight ratio of 1: 0.3: 0.2;
e. putting the secondary recycled aggregate obtained in the step d into the modification liquid again, mixing for 30min at the temperature of 120 ℃ under the condition of 600r/min, adding a porous material into the secondary recycled aggregate according to the weight ratio of 0.10 in the mixing process, taking out and drying to obtain the modified recycled aggregate;
the porous material is prepared from ceramic powder, activated carbon and wood fiber according to a weight ratio of 1: 0.8: 0.8.
Preparation example 2
A modified recycled aggregate is prepared by the following steps:
a. firstly, heating the waste concrete blocks to 1100 ℃, rapidly cooling the waste concrete blocks to room temperature by water, and then putting the waste concrete blocks into a sand crusher for grinding to prepare crushed powder with the particle size of less than 30mm for later use;
b. b, putting the crushed powder prepared in the step a into a modification solution, soaking for 5 days, taking out and drying to prepare modified crushed powder for later use;
the modifying solution is added with a pickling agent, and the pickling agent is prepared from oxalic acid and hydrochloric acid in a volume ratio of 1: 0.4, and the ph of the modifying liquid is 3.5;
the modified liquid is prepared from water, silicon dioxide colloid, chitosan, calcium carbonate and a solvent according to the weight ratio of 1: 0.2: 0.05: 0.1;
c. b, putting the modified crushed powder obtained in the step b into a ball mill, carrying out secondary grinding and crushing, and screening the modified crushed powder with the particle size of 10-25mm as primary recycled aggregate;
d. calcining the primary recycled aggregate obtained in the step c at 1400 ℃ for 4 hours, continuously adding modified powder in the calcining process according to the weight ratio of 0.075 of the primary recycled aggregate, introducing nitrogen after calcining and sintering, cooling to room temperature, and taking a calcined product with the particle size of 10-25mm as a secondary recycled aggregate;
the modified powder is prepared from micro silicon powder, acid clay and volcanic soil in a weight ratio of 1: 0.3: 0.2;
e. putting the secondary recycled aggregate obtained in the step d into the modification liquid again, mixing for 45min at 135 ℃ under the condition of 800r/min, adding a porous material according to the weight ratio of 0.125 of the secondary recycled aggregate in the mixing process, taking out and drying to obtain the modified recycled aggregate;
the porous material is prepared from ceramic powder, activated carbon and wood fiber according to a weight ratio of 1: 0.8: 0.8.
Preparation example 3
A modified recycled aggregate is prepared by the following steps:
a. firstly, heating the waste concrete blocks to 1200 ℃, rapidly cooling the waste concrete blocks to room temperature by water, and then putting the waste concrete blocks into a sand crusher for grinding to prepare crushed powder with the particle size of less than 30mm for later use;
b. b, putting the crushed powder prepared in the step a into a modification solution, soaking for 6 days, taking out and drying to prepare modified crushed powder for later use;
the modifying solution is added with a pickling agent, and the pickling agent is prepared from oxalic acid and hydrochloric acid in a volume ratio of 1: 0.5, and the ph of the modifying liquid is 2.5;
the modified liquid is prepared from water, silicon dioxide colloid, chitosan, calcium carbonate and a solvent according to the weight ratio of 1: 0.2: 0.05: 0.1;
c. b, putting the modified crushed powder obtained in the step b into a ball mill, carrying out secondary grinding and crushing, and screening the modified crushed powder with the particle size of 10-25mm as primary recycled aggregate;
d. calcining the primary recycled aggregate obtained in the step c at 1500 ℃ for 5 hours, continuously adding modified powder according to 0.10 of the weight ratio of the primary recycled aggregate in the calcining process, introducing nitrogen to cool to room temperature after calcining, and taking a calcined product with the particle size of 10-25mm as a secondary recycled aggregate;
the modified powder is prepared from micro silicon powder, acid clay and volcanic soil in a weight ratio of 1: 0.3: 0.2;
e. putting the secondary recycled aggregate obtained in the step d into the modification liquid again, mixing for 60min at 135 ℃ under the condition of 1000r/min, adding a porous material according to the weight ratio of 0.15 of the secondary recycled aggregate in the mixing process, taking out and drying to obtain the modified recycled aggregate;
the porous material is prepared from ceramic powder, activated carbon and wood fiber according to a weight ratio of 1: 0.8: 0.8.
Preparation example 4
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the modifying solution is prepared from water, silica colloid, chitosan, calcium carbonate and a solvent according to the weight ratio of 1: 0.25: 0.065: 0.125.
Preparation example 5
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the modifying solution is prepared from water, silica colloid, chitosan, calcium carbonate and a solvent according to the weight ratio of 1: 0.3: 0.08: 0.15.
Preparation example 6
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the modified powder in the step d is prepared from silica fume, acid clay and volcanic soil according to the weight ratio of 1: 0.4: 0.25.
Preparation example 7
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the modified powder in the step d is prepared from silica fume, acid clay and volcanic soil according to the weight ratio of 1: 0.5: 0.3.
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 e is prepared from ceramic powder, activated carbon and wood fiber in a weight ratio of 1: 0.9: 0.9.
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 e is prepared from ceramic powder, activated carbon and wood fiber in a weight ratio of 1: 1: 1.
Examples
Example 1
The environment-friendly anti-cracking concrete comprises the following components in parts by weight as 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, the modified recycled aggregate in the preparation example 1 and the reinforcing agent in corresponding parts by weight to obtain a mixture B;
the reinforcing agent is prepared from triethanolamine, sodium gluconate, sodium citrate and sodium methallyl sulfonate according to the weight ratio of 1: 0.2: 0.1: 0.02 composition;
s3, dissolving a water reducing agent into water to obtain a mixture C, wherein the water reducing agent is prepared from calcium lignosulfonate, sodium methallyl sulfonate and volcanic ash in a weight ratio of 1: 0.5: 0.5;
and S4, uniformly mixing the mixture A and the mixture B, adding the mixture C, and uniformly stirring and mixing to obtain the environment-friendly anti-crack concrete.
Examples 2 to 6
An environment-friendly anti-crack concrete, which is different from the concrete of example 1 in that the components and the corresponding weights thereof are shown in Table 1.
TABLE 1 Components and weights (kg) thereof in examples 1-6
Example 7
An environment-friendly anti-cracking 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 anti-cracking concrete.
Example 8
An environment-friendly anti-cracking 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 anti-cracking concrete.
Example 9
An environment-friendly anti-cracking 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 anti-cracking concrete.
Example 10
An environment-friendly anti-cracking 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 anti-cracking concrete.
Example 11
An environment-friendly anti-cracking 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 anti-cracking concrete.
Example 12
An environment-friendly anti-cracking concrete, which 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 anti-cracking concrete.
Example 13
An environment-friendly anti-cracking 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 anti-cracking concrete.
Example 14
An environment-friendly anti-cracking concrete, which 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 anti-cracking concrete.
Example 15
The environment-friendly anti-cracking concrete is different from the concrete in example 1 in that the reinforcing agent is prepared from triethanolamine, sodium gluconate, sodium citrate and sodium methallyl sulfonate in a weight ratio of 1: 0.25: 0.15: 0.025.
Example 16
The environment-friendly anti-cracking concrete is different from the concrete in example 1 in that the reinforcing agent is prepared from triethanolamine, sodium gluconate, sodium citrate and sodium methallyl sulfonate in a weight ratio of 1: 0.3: 0.2: 0.03 composition.
Example 17
The environment-friendly anti-cracking concrete is different from the concrete in example 1 in that the water reducing agent is prepared from calcium lignosulfonate, sodium methallyl sulfonate and volcanic ash in a weight ratio of 1: 0.75: 0.75 composition.
Example 18
The environment-friendly anti-cracking concrete is different from the concrete in example 1 in that the water reducing agent is prepared from calcium lignosulfonate, sodium methallyl sulfonate and volcanic ash in a weight ratio of 1: 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 after only a crushing treatment.
Comparative example 2: a concrete, which is different from the concrete prepared in example 1 in that no modifying liquid is contained in the steps b and e in the preparation process of the modified recycled aggregate.
Comparative example 3: a concrete, which is different from example 1 in that the preparation process of the modified recycled aggregate does not include the step d.
Comparative example 4: a concrete, which is different from example 1 in that the preparation process of the modified recycled aggregate does not include steps b and d.
Comparative example 5: a concrete, which is different from example 1 in that the preparation process of the modified recycled aggregate does not include the step e.
Comparative example 6: a concrete, which is different from the concrete of example 1 in that a porous material is not added in the preparation process e of the modified recycled aggregate.
Performance test
The concrete prepared in examples 1 to 18 and comparative examples 1 to 6 were used as test objects, and after curing for 28 days, the compressive strength, the splitting tensile strength, and whether cracks were generated on the surface of each set of samples were measured, 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 1-18, the compressive strength is higher than 39.81MPa, and the tensile strength at splitting is higher than 3.39MPa, wherein the concrete prepared by adopting the components in the proportion in example 4 has the highest strength and the best crack resistance; in the embodiment 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 best, and is improved by 16 percent compared with the concrete in the embodiment 1; the reinforcing agent used in the concrete in the embodiment 15 has the best effect of improving the mechanical property of the concrete, and is improved by 6% compared with the concrete in the embodiment 1.
By combining the example 1 and the comparative example 1 and combining the table 2, it can be seen that the crack resistance of the concrete is greatly reduced and the strength is reduced by 13% while the crack of 4.9cm is generated in the comparative example 1 because the added recycled aggregate is not modified.
Combining example 1 and comparative example 2, and combining table 2, it can be seen that comparative example 2 has a 12% strength reduction and a crack of 4.3cm occurred due to the modified recycled aggregate preparation process, which does not include the modifying liquid in step b and step e.
Combining example 1 and comparative example 3, and combining table 2, it can be seen that comparative example 3 has a small decrease in strength of 4% and a small crack of 1.8cm since the modified recycled aggregate was not prepared by step d.
Combining example 1 and comparative example 4, and combining table 2, it can be seen that comparative example 4 has a 12% strength reduction and a 4.7cm large crack occurred because the modified recycled aggregate was prepared without the b and d steps.
By combining the concrete of example 1, the concrete of comparative example 5 and the concrete of comparative example 6 and combining the concrete of table 2, the strength of the concrete of example 1 is improved by 8% and 4% respectively compared with the concrete of comparative example 5 and the concrete of comparative example 6.
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 anti-crack concrete is characterized by comprising the following components in parts by weight:
cement of 280 and 300 portions;
100 portions of fly ash and 120 portions of fly ash;
500 portions and 550 portions of sand;
600 portions of fine stone and 700 portions of fine stone;
100 portions of water and 150 portions of water;
2-5 parts of a water reducing agent;
2-5 parts of a reinforcing agent;
500 portions and 600 portions of modified recycled aggregate;
the modified recycled aggregate is obtained by the following preparation steps:
a. firstly, heating the waste concrete blocks to 1000-1200 ℃, rapidly cooling the waste concrete blocks to room temperature by water, and then putting the waste concrete blocks into a sand crusher for grinding to prepare crushed powder with the particle size of less than 30mm for later use;
b. b, putting the crushed powder prepared in the step a into the modification solution, soaking for 4-6 days, taking out and drying to prepare modified crushed powder for later use;
a pickling agent is added into the modification solution, and the ph of the modification solution is 2.5-4.5;
the modifying solution is an aqueous solution consisting of one or more of silicon dioxide colloid, chitosan and calcium carbonate;
c. b, putting the modified crushed powder obtained in the step b into a ball mill, carrying out secondary grinding and crushing, and screening the modified crushed powder with the particle size of 10-25mm as primary recycled aggregate;
d. calcining the primary recycled aggregate obtained in the step c at 1300-1500 ℃ for 3-5h, continuously adding modified powder according to 0.05-0.10 of the weight ratio of the primary recycled aggregate in the calcining process, introducing nitrogen to cool to room temperature after calcining, and taking a calcined product with the particle size of 10-25mm as secondary recycled aggregate;
the modified powder is composed of one or more of volcanic rock, acid clay and silica fume;
e. and (d) putting the secondary recycled aggregate obtained in the step (d) into the modification liquid again, mixing for 30-60min under the conditions of temperature of 120-150 ℃ and temperature of 600-1000r/min, adding a porous material in the mixing process according to the weight ratio of 0.10-0.15 of the secondary recycled aggregate, taking out and drying to obtain the modified recycled aggregate.
2. The environment-friendly anti-crack concrete according to claim 1, wherein the acid pickling agent in the step b is prepared from oxalic acid and hydrochloric acid in a volume ratio of 1: (0.3-0.5).
3. The environment-friendly anti-crack concrete according to claim 1, wherein the modifying solution in the step b is prepared from water, silica gel, chitosan, calcium carbonate, and the following components in a weight ratio of 1: (0.2-0.3): (0.05-0.08): (0.1-0.15).
4. The environment-friendly anti-crack concrete according to claim 1, wherein the modified powder in the step d is prepared from silica fume, acid clay and volcanic rock according to the weight ratio of 1 (0.3-0.5): (0.2-0.3).
5. The environment-friendly anti-crack concrete according to claim 1, wherein the porous material in e is prepared from ceramic powder, activated carbon and wood fiber according to a weight ratio of 1: (0.8-1.0): (0.8-1.0).
6. The environment-friendly anti-crack concrete according to claim 1, wherein the water reducing agent is prepared from calcium lignosulfonate, sodium methallyl sulfonate and volcanic ash in a weight ratio of 1: (0.5-1): (0.5-1).
7. The environment-friendly anti-crack concrete according to claim 1, wherein the reinforcing agent is prepared from triethanolamine, sodium gluconate, sodium citrate and sodium methallyl sulfonate according to a weight ratio of 1: (0.2-0.3): (0.1-0.2): (0.02-0.03).
8. The environment-friendly anti-crack concrete according to claim 1, wherein the sand is natural medium sand in the area II, the fineness modulus is 2.6, the mud content is less than 0.6%, and the fine stones are continuous graded broken stones with the particle size of 5-20 mm.
9. The method for preparing environment-friendly anti-crack concrete according to any one of claims 1 to 8, characterized by comprising 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, the modified recycled aggregate and the reinforcing agent 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 uniformly stirring and mixing to obtain the environment-friendly anti-crack concrete.
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| CN115745447A (en) * | 2022-11-28 | 2023-03-07 | 纳琦绿能工程有限公司 | Concrete prepared by regenerating waste concrete and preparation method thereof |
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