CN116283034A - Waterproof anti-cracking concrete additive and preparation method thereof - Google Patents

Abstract

The invention discloses a waterproof anti-cracking concrete additive which comprises the following components in parts by mass: 10-15 parts of sodium gluconate, 3-5 parts of silica gel powder, 0.8-1.2 parts of rubber, 8-12 parts of rattan skin, 10-13 parts of water reducer, 1-1.2 parts of sodium polyethylene sulfonate, 0.4-0.7 part of methyl cellulose, 2-5 parts of antioxidant and 1-2 parts of surfactant; the waterproof anti-cracking concrete admixture is prepared by stirring the components at a high speed; according to the invention, the water resistance and hydrophobicity of the admixture are increased by adding the silica gel powder and the rubber, so that the prepared concrete admixture has better hydrophobicity in actual use, and the grinding slurry of rattan skin is added, so that the rattan has stronger toughness and elasticity, and the grinding slurry is mixed in the admixture for use together with the concrete, thereby increasing the binding force of the concrete and avoiding the problem that the concrete is easy to crack.

Description

Waterproof anti-cracking concrete additive and preparation method thereof

Technical Field

The invention belongs to the technical field of concrete production, and particularly relates to an admixture for concrete, in particular to a waterproof anti-cracking concrete admixture and a preparation method thereof.

Background

Concrete (Concrete), abbreviated as "Concrete (t bang)": refers to the collective term for engineering composite materials in which aggregate is consolidated into a whole by a cementitious material. The term concrete generally refers to cement as a cementing material, sand and stone as aggregate; mixing with water (which can contain additives and admixtures) according to a certain proportion, and stirring to obtain cement concrete, also called ordinary concrete, which is widely applied to civil engineering; the concrete in the modern building industry has good use effect, and different additives are usually added into the concrete to achieve the effect required by use under different environments.

Concrete admixture means a substance incorporated to improve and adjust the properties of concrete; the application of the concrete admixture in engineering is more and more emphasized, and the addition of the admixture plays a certain role in improving the performance of the concrete, but the selection, the addition method and the adaptability of the admixture seriously affect the development of the admixture.

In the prior art, the concrete admixture has a plurality of types, but most concrete admixture has poor water resistance, so that the problem of cracking of concrete after being soaked in water is caused.

Patent application number CN202111575364.9, the contents of which are: the invention discloses a waterproof anti-cracking concrete additive and a preparation method thereof, and belongs to the technical field of building material additives. The waterproof and anti-cracking concrete additive comprises 20-30% of water reducer, 10-15% of sodium gluconate, 0.05-0.3% of air entraining agent, 0.05-2% of acrylic ester copolymer, 0.01-1.5% of sodium sulfonate polymer, 0.01-0.5% of cellulose ether, 0.01-0.5% of polypropylene fiber, 0.01-0.5% of water repellent and the balance of water; the novel waterproof anti-cracking concrete additive greatly improves the anti-freezing and anti-permeability properties of concrete, improves the durability of the concrete and prolongs the service life of the concrete under the combined action of the raw materials. Meanwhile, the novel waterproof anti-cracking concrete additive disclosed by the invention is simple and convenient in preparation method, low in cost and remarkable in economic and social benefits.

The concrete admixture prepared by the patent improves the anti-freezing and anti-permeability properties of concrete, so that the durability and the service life of the concrete are improved, but because air holes exist in the concrete, the hydrophobicity in the air holes is poor, so that a concrete building body is easy to crack, the quality of the building body is reduced, and the service life is shortened.

Disclosure of Invention

Aiming at the technical problems proposed by the background technology, the invention adopts the following technical scheme:

the waterproof anti-cracking concrete additive comprises the following components in parts by mass:

10-15 parts of sodium gluconate, 3-5 parts of silica gel powder, 0.8-1.2 parts of rubber, 8-12 parts of rattan skin, 10-13 parts of water reducer, 1-1.2 parts of sodium polyvinyl sulfonate, 0.4-0.7 part of methyl cellulose, 2-5 parts of antioxidant and 1-2 parts of surfactant.

Preferably, the composition comprises the following components in parts by mass:

12-13 parts of sodium gluconate, 3.5-4.5 parts of silica gel powder, 0.9-1.1 parts of rubber, 9-11 parts of rattan skin, 11-12 parts of water reducer, 1-1.1 parts of sodium polyethylene sulfonate, 0.5-0.6 part of methylcellulose, 3-4 parts of antioxidant and 1.3-1.7 parts of surfactant.

Preferably, the composition comprises the following components in parts by mass:

12.5 parts of sodium gluconate, 4 parts of silica gel powder, 1 part of rubber, 10 parts of rattan skin, 11.5 parts of water reducer, 1.05 parts of sodium polyethylene sulfonate, 0.55 part of methylcellulose, 3.5 parts of antioxidant and 1.5 parts of surfactant.

Preferably, the silica gel powder is stepless silica gel powder, and the particle size is required to be 80-100 meshes.

Preferably, the rubber is cis-1, 4-polybutadiene rubber.

Preferably, the water reducer is a polycarboxylic acid high-performance water reducer.

Preferably, the antioxidant is dibutyl hydroxytoluene.

Preferably, the surfactant is a hydrophobic surfactant, mainly alkylbenzene sulfonate.

A method for preparing a waterproof and anti-cracking concrete additive, which comprises the following steps:

1) Adding water into the rattan skin with the corresponding mass parts according to the mass ratio of 1:20 for grinding, and grinding to slurry;

2) And adding the weighed sodium gluconate, silica gel powder, rubber, a water reducing agent, sodium polyvinylsulfonate, methyl cellulose, an antioxidant and a surfactant into the ground rattan skin slurry, and stirring at a high speed for 30-60 min until the components are completely and uniformly mixed to obtain the concrete additive.

Preferably, the fiber fineness of the rattan skin grinding slurry in the step 1) is 0.5-0.8tex.

By adopting the technical scheme of the invention, the following beneficial effects are obtained: according to the invention, the silica gel powder and the rubber are added, so that the air holes in the concrete can be fully filled by the inorganic silica gel powder and the rubber, and excessive water in the concrete building body is avoided, so that the water resistance and hydrophobicity of the air holes in the concrete building body are improved by the concrete admixture, the prepared concrete admixture has better hydrophobicity when in actual use, the grinding slurry of rattan skin is added, rattan has stronger toughness and elasticity, and the grinding slurry is mixed in the admixture for use together with the concrete, so that the binding force of the concrete is increased, and the problem that the concrete is easy to crack is avoided.

Detailed Description

In order that those skilled in the art can better understand the present invention, the following description of the technical scheme of the present invention will be provided with reference to examples.

Example 1

The waterproof anti-cracking concrete additive is characterized by comprising the following components in parts by mass: 10-15 parts of sodium gluconate, 3-5 parts of silica gel powder, 0.8-1.2 parts of rubber, 8-12 parts of rattan skin, 10-13 parts of water reducer, 1-1.2 parts of sodium polyvinyl sulfonate, 0.4-0.7 part of methyl cellulose, 2-5 parts of antioxidant and 1-2 parts of surfactant.

Comprises the following components in parts by mass: 12-13 parts of sodium gluconate, 3.5-4.5 parts of silica gel powder, 0.9-1.1 parts of rubber, 9-11 parts of rattan skin, 11-12 parts of water reducer, 1-1.1 parts of sodium polyethylene sulfonate, 0.5-0.6 part of methylcellulose, 3-4 parts of antioxidant and 1.3-1.7 parts of surfactant.

Comprises the following components in parts by mass: 12.5 parts of sodium gluconate, 4 parts of silica gel powder, 1 part of rubber, 10 parts of rattan skin, 11.5 parts of water reducer, 1.05 parts of sodium polyethylene sulfonate, 0.55 part of methylcellulose, 3.5 parts of antioxidant and 1.5 parts of surfactant.

The silica gel powder is stepless silica gel powder, and the particle size is required to be 80-100 meshes.

The rubber is cis-1, 4-polybutadiene rubber.

The water reducer is a polycarboxylic acid high-performance water reducer.

The antioxidant is dibutyl hydroxy toluene.

The surfactant is a hydrophobic surfactant and mainly is alkylbenzene sulfonate.

A method for preparing a waterproof and anti-cracking concrete additive, which comprises the following steps:

1) Adding water into the rattan skin with the corresponding mass parts according to the mass ratio of 1:20 for grinding, and grinding to slurry;

2) And adding the weighed sodium gluconate, silica gel powder, rubber, a water reducing agent, sodium polyvinylsulfonate, methyl cellulose, an antioxidant and a surfactant into the ground rattan skin slurry, and stirring at a high speed for 30-60 min until the components are completely and uniformly mixed to obtain the concrete additive.

The fiber fineness of the rattan skin grinding slurry in the step 1) is 0.5-0.8tex.

Example 1

And (3) placing 9 parts of rattan skin and water in a grinder according to the mass ratio of 1:20 for grinding until the fiber fineness of the ground slurry is 0.5-0.8tex, taking out the slurry, pouring the slurry into a reaction barrel, sequentially adding 12 parts of sodium gluconate, 3.5 parts of inorganic silica gel powder, 0.9 part of cis-1, 4-polybutadiene rubber, 11 parts of a polycarboxylic acid high-performance water reducer, 1 part of sodium polyethylene sulfonate, 0.5 part of methyl cellulose, 3 parts of dibutylhydroxytoluene and 1.3 parts of an alkylbenzene sulfonate active agent into the reaction barrel, stirring at a high speed for 40min until the mixture is completely and uniformly mixed, preparing a concrete additive A, adding the concrete additive A into the concrete according to the proportion of 10 percent, and detecting that the prepared concrete with the thickness of 10 meters has the compression strength of medium anti-freezing grade of more than or equal to 200, the grade P10 and less surface cracks.

Example 2

10 parts of rattan skin and water are placed in a grinder according to the mass ratio of 1:20 for grinding until the fineness of the slurry fiber is 0.5-0.8tex, the slurry is taken out and poured into a reaction barrel, 12.5 parts of sodium gluconate, 4 parts of inorganic silica gel powder, 1 part of cis-1, 4-polybutadiene rubber, 11.5 parts of a polycarboxylic acid high-performance water reducer, 1.05 parts of sodium polyethylene sulfonate, 0.55 part of methyl cellulose, 3.5 parts of dibutyl hydroxy toluene and 1.5 parts of an alkylbenzene sulfonate active agent are sequentially added into the reaction barrel, the mixture is stirred at a high speed for 40min until the mixture is completely and uniformly mixed, a concrete additive B is obtained, the concrete additive B is added into concrete according to the proportion of 10 percent, the prepared concrete with the ratio of 10 square meters is superior in compression strength, the anti-freezing grade of more than or equal to 300, the anti-permeability grade of the concrete is more than P12, and no obvious cracks are formed on the surface.

Example 3

Placing 11 parts of rattan skin and water in a grinder according to the mass ratio of 1:20 for grinding until the fineness of the fiber of the ground slurry is 0.5-0.8tex, taking out the slurry, pouring the slurry into a reaction barrel, sequentially adding 13 parts of sodium gluconate, 4.5 parts of inorganic silica gel powder, 1.1 parts of cis-1, 4-polybutadiene rubber, 12 parts of a polycarboxylic acid high-performance water reducer, 1.1 parts of sodium polyethylene sulfonate, 0.6 part of methyl cellulose, 4 parts of dibutyl hydroxy toluene and 1.7 parts of an alkylbenzene sulfonate active agent into the reaction barrel, stirring at a high speed for 40min until the fiber fineness of the ground slurry is 0.5-0.8tex, adding the mixture into the concrete at a ratio of 10% to prepare concrete, and detecting that the prepared concrete with 10-square meter has good compression strength, an anti-freezing grade of more than or equal to 300, a grade of P12 and no obvious cracks on the surface.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims of this invention, which are within the skill of those skilled in the art, can be made without departing from the spirit and scope of the invention disclosed herein.

Claims (10)

1. The waterproof anti-cracking concrete additive is characterized by comprising the following components in parts by mass:

10-15 parts of sodium gluconate, 3-5 parts of silica gel powder, 0.8-1.2 parts of rubber, 8-12 parts of rattan skin, 10-13 parts of water reducer, 1-1.2 parts of sodium polyvinyl sulfonate, 0.4-0.7 part of methyl cellulose, 2-5 parts of antioxidant and 1-2 parts of surfactant.

2. The waterproof and anti-cracking concrete additive according to claim 1, which is characterized by comprising the following components in parts by mass:

12-13 parts of sodium gluconate, 3.5-4.5 parts of silica gel powder, 0.9-1.1 parts of rubber, 9-11 parts of rattan skin, 11-12 parts of water reducer, 1-1.1 parts of sodium polyethylene sulfonate, 0.5-0.6 part of methylcellulose, 3-4 parts of antioxidant and 1.3-1.7 parts of surfactant.

3. The waterproof and anti-cracking concrete additive according to claim 1, which is characterized by comprising the following components in parts by mass:

12.5 parts of sodium gluconate, 4 parts of silica gel powder, 1 part of rubber, 10 parts of rattan skin, 11.5 parts of water reducer, 1.05 parts of sodium polyethylene sulfonate, 0.55 part of methylcellulose, 3.5 parts of antioxidant and 1.5 parts of surfactant.

4. The waterproof and anti-crack concrete admixture according to claim 1, wherein: the silica gel powder is stepless silica gel powder, and the particle size is required to be 80-100 meshes.

5. The waterproof and anti-crack concrete admixture according to claim 1, wherein: the rubber is cis-1, 4-polybutadiene rubber.

6. The waterproof and anti-crack concrete admixture according to claim 1, wherein: the water reducer is a polycarboxylic acid high-performance water reducer.

7. The waterproof and anti-crack concrete admixture according to claim 1, wherein: the antioxidant is dibutyl hydroxy toluene.

8. The waterproof and anti-crack concrete admixture according to claim 1, wherein: the surfactant is a hydrophobic surfactant and mainly is alkylbenzene sulfonate.

9. The preparation method of the waterproof anti-cracking concrete additive is characterized by comprising the following steps of:

1) Adding water into the rattan skin with the corresponding mass parts according to the mass ratio of 1:20 for grinding, and grinding to slurry;

2) And adding the weighed sodium gluconate, silica gel powder, rubber, a water reducing agent, sodium polyvinylsulfonate, methyl cellulose, an antioxidant and a surfactant into the ground rattan skin slurry, and stirring at a high speed for 30-60 min until the components are completely and uniformly mixed to obtain the concrete additive.

10. The method of manufacturing according to claim 9, wherein: the fiber fineness of the rattan skin grinding slurry in the step 1) is 0.5-0.8tex.