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Anti-cracking shrinkage-reducing concrete admixture and preparation method thereof

A concrete admixture and shrinkage technology, which is applied in the field of building materials, can solve the problems of cement paste performance decline, GO difficult to disperse uniformly, etc., and achieve the effect of improving the bubble structure properties, improving work performance, and good dispersion

Pending Publication Date: 2021-04-27
GUIZHOU KEZHIJIE NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the current application of graphene oxide in concrete admixture mentioned in the above-mentioned background technology, GO is directly compounded and mixed into concrete mixing. It is found that there is a problem that the working performance of some cement pastes mixed with GO is reduced. The invention provides a kind of anti-cracking and shrinkage-reducing concrete admixture, which includes the following preparation raw materials: unsaturated polyoxyethylene ether monomer, catalyst, Acrylic acid, functionalized modified nanographene oxide solution, initiator, chain transfer agent, unsaturated acid, crosslinking agent, quaternary ammonium salt cationic monomer, reducing agent

Method used

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  • Anti-cracking shrinkage-reducing concrete admixture and preparation method thereof
  • Anti-cracking shrinkage-reducing concrete admixture and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] Step 1, adding 150 parts by weight of isopentenyl polyoxyethylene ether with a molecular weight of 3000, 3 parts by weight of N,N-diethylaniline and 18 parts by weight of acrylic acid to 160 parts by weight of a pre-prepared functional modified After ultrasonic treatment for 15 minutes, add it into the reaction device, heat to 80°C, and keep stirring;

[0044] Wherein, the preparation method of functionalized modified nano-graphene oxide solution is:

[0045]Step a, add 60 parts by weight of concentrated sulfuric acid, 1 part by weight of graphite powder, and 3 parts by weight of sodium nitrate in a four-necked flask, and ultrasonicate for 30 minutes. During the process, control the temperature of the solution below 5°C, and then add 5 parts by weight of Potassium permanganate was continuously stirred at a speed of 300r / min for 3h, and the temperature was controlled below 10°C during stirring. Then, the reaction device was transferred to a water bath condition of 40° C...

Embodiment 2

[0053] Step 1, adding 150 parts by weight of isopentenyl polyoxyethylene ether with a molecular weight of 3000, 3 parts by weight of N,N-diethylaniline and 18 parts by weight of acrylic acid to 160 parts by weight of a pre-prepared functional modified After ultrasonic treatment for 15 minutes, add it into the reaction device, heat to 80°C, and keep stirring;

[0054] Wherein, the preparation method of functionalized modified nano-graphene oxide solution is:

[0055] Step a, add 60 parts by weight of concentrated sulfuric acid, 1 part by weight of graphite powder, and 3 parts by weight of sodium nitrate in a four-necked flask, and ultrasonicate for 30 minutes. During the process, control the temperature of the solution below 5°C, and then add 5 parts by weight of Potassium permanganate was continuously stirred at a speed of 300r / min for 3h, and the temperature was controlled below 10°C during stirring. Then, the reaction device was transferred to a water bath condition of 40° ...

Embodiment 3

[0063] Step 1, adding 150 parts by weight of isopentenyl polyoxyethylene ether with a molecular weight of 3000, 3 parts by weight of N,N-diethylaniline and 18 parts by weight of acrylic acid to 160 parts by weight of a pre-prepared functional modified After ultrasonic treatment for 15 minutes, add it into the reaction device, heat to 80°C, and keep stirring;

[0064] Wherein, the preparation method of functionalized modified nano-graphene oxide solution is:

[0065] Step a, add 60 parts by weight of concentrated sulfuric acid, 1 part by weight of graphite powder, and 3 parts by weight of sodium nitrate in a four-necked flask, and ultrasonicate for 30 minutes. During the process, control the temperature of the solution below 5°C, and then add 5 parts by weight of Potassium permanganate was continuously stirred at a speed of 300r / min for 3h, and the temperature was controlled below 10°C during stirring. Then, the reaction device was transferred to a water bath condition of 40° ...

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Abstract

The invention relates to the technical field of building materials, in particular to an anti-crack shrinkage-reducing type concrete admixture and a preparation method thereof. The concrete admixture comprises the following preparation raw materials: an unsaturated polyoxyethylene ether monomer, a catalyst, acrylic acid, a functionalized modified nano graphene oxide solution, an initiator, a chain transfer agent, unsaturated acid, a cross-linking agent, a quaternary ammonium salt cationic monomer and a reducing agent. According to the anti-cracking shrinkage-reducing concrete admixture provided by the invention, a functionalized modified nano graphene oxide solution is introduced into a polycarboxylate-type water reducing agent polymerization system, and copolymerization modification is carried out on nano graphene oxide through the bonding effect between a large number of oxygen-containing functional groups, thus the composite modified concrete admixture with better dispersity and more stable properties is obtained, meanwhile, the effects of filling, connecting and healing micropore cracks are achieved, the interface and binding power are enhanced, and the structural properties of bubbles in concrete are improved, so that the crack resistance and shrinkage reduction properties of concrete are improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an anti-crack and shrinkage-reducing concrete admixture and a preparation method thereof. Background technique [0002] High-performance concrete is a new type of high-tech concrete. It is made of modern concrete technology on the basis of greatly improving the performance of ordinary concrete. It mainly uses durability, workability and applicability as indicators to meet different purposes. requirements. For high-performance concrete, crack resistance and shrinkage performance are also an important indicator of its durability. Dry crack shrinkage will cause microscopic cracks and original cracks inside the concrete. Once the load is applied and certain conditions are applied, these cracks will develop into concrete. The macroscopic cracks visible to the naked eye will cause cracking of the concrete, resulting in deterioration of concrete performance and reduced durab...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F292/00C08F220/06C08F222/14C08F220/24C04B24/16C04B24/26
CPCC08F283/065C08F292/00C04B24/163C04B24/2694C04B2103/302C08F220/06C08F220/24
Inventor 朱少宏方云辉柯余良张小芳钟丽娜林芹林艳梅李格丽郭元强
Owner GUIZHOU KEZHIJIE NEW MATERIAL
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