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Concrete shrinkage reducing agent and preparation method and application thereof

A technology of concrete shrinkage reducing agent and reactant, which is applied in the field of concrete shrinkage reducing agent and its preparation, can solve the problems that affect concrete strength, the mechanism of shrinkage reducing agent and shrinkage crack is not very clear, and achieve good freeze-thaw resistance and compressive strength. , Improve the physical properties of concrete, the effect of excellent fluidity

Active Publication Date: 2017-08-11
江苏超力建材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although researchers have carried out a lot of research and development work on shrinkage reducing agents, they still cannot fundamentally solve the existing problems of shrinkage cracks, and even affect the strength of concrete.
The reason is that the mechanism of action between shrinkage reducing agent and shrinkage crack prevention is not very clear, and the function of water reduction and shrinkage reduction is still an unavoidable contradiction

Method used

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  • Concrete shrinkage reducing agent and preparation method and application thereof
  • Concrete shrinkage reducing agent and preparation method and application thereof
  • Concrete shrinkage reducing agent and preparation method and application thereof

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preparation example Construction

[0022] The invention provides a kind of preparation method of concrete shrinkage reducing agent, comprises the steps:

[0023] S101: Mix the first monomer, initiator and water uniformly to obtain the first reactant, and raise the temperature of the first reactant to 55-65°C; wherein, the first monomer is allyl with a weight average molecular weight of 1000-2400 base polyoxyethylene ether, the initiator is selected from one or more of azobisisobutyronitrile, dimethyl azobisisobutyrate, ammonium persulfate and potassium persulfate, and the initiator is the first monomer, 0.1%-2% of the total moles of the second monomer and the third monomer; the mass ratio of water to the first monomer is (0.5-1):1;

[0024]S102: uniformly mix the second monomer and water to obtain a second reactant; wherein, the second monomer is acrylic acid, and the mass ratio of water to the second monomer is (9-12):1;

[0025] S103: Mix the third monomer and the fourth monomer uniformly to obtain the third...

Embodiment 1

[0032] This embodiment provides a concrete shrinkage reducing agent and a preparation method thereof, the preparation method comprising the following steps:

[0033] S101: Mix 1 mol of the first monomer allyl polyoxyethylene ether (weight average molecular weight 1510), the initiator dimethyl azobisisobutyrate and water to obtain the first reactant, and raise the temperature of the first reactant to 60°C; wherein, the molar ratio of the first monomer, the second monomer, the third monomer and the fourth monomer is 1:2:1.5:0.2; the initiator is the first monomer, the second monomer and 1% of the total moles of the third monomer; the mass ratio of water and the first monomer is 0.8:1;

[0034] S102: uniformly mix the second monomer acrylic acid and water to obtain a second reactant; wherein the mass ratio of water to the second monomer is 10:1;

[0035] S103: uniformly mixing the third monomer diethylene glycol monobutyl ether methacrylate and the fourth monomer phellandrene to...

Embodiment 2

[0041] This embodiment provides a concrete shrinkage reducing agent and a preparation method thereof, the preparation method comprising the following steps:

[0042] S101: Mix 1 mol of the first monomer allyl polyoxyethylene ether (weight average molecular weight 1000), the initiator dimethyl azobisisobutyrate and water to obtain the first reactant, and raise the temperature of the first reactant to 55°C; wherein, the molar ratio of the first monomer, the second monomer, the third monomer and the fourth monomer is 1:0.8:0.8:0.1; the initiator is the first monomer, the second monomer and 0.1% of the total moles of the third monomer; the mass ratio of water and the first monomer is 0.5:1;

[0043] S102: uniformly mix the second monomer acrylic acid and water to obtain a second reactant; wherein, the mass ratio of water to the second monomer is 9:1;

[0044] S103: uniformly mixing the third monomer diethylene glycol monobutyl ether methacrylate and the fourth monomer phellandren...

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Abstract

The invention relates to a concrete shrinkage reducing agent and a preparation method and application thereof. The preparation method comprises the following steps that acrylic polyether, an initiator and water are mixed to be uniform, a first reactant is obtained, and temperature rise is carried out; crylic acid and water are mixed to be uniform, and a second reactant is obtained; methacrylic acid diethylene glycol monobutyl ether ester and phellandrene are mixed to be uniform, and a third reactant is obtained; a reducing agent, a chain transfer agent and water are mixed to be uniform, and a fourth reactant is obtained; the second reactant, the third reactant and the fourth reactant are dropwise added into the first reactant obtained after temperature rise at the same time; after all the reactants are dropwise added, heat preservation is carried out, and then cooling is carried out; an alkaline solution and water are added into the obtained product, and the concrete shrinkage reducing agent is obtained. According to the prepared concrete shrinkage reducing agent, the water reducing and shrinkage function of the concrete shrinkage reducing agent can be enhanced, the antifreezing capacity, compressive strength and anti-cracking ability of concrete can be improved, and the service life of the concrete can be prolonged; the production cost of the concrete can be reduced, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a concrete shrinkage reducer and its preparation method and application. Background technique [0002] Cement, a hydraulic cementitious material, has plasticity after being mixed with water, and at the same time has the cementing performance of bonding aggregates such as sand and gravel, and then gradually loses plasticity and hardens into a stone-like body with a certain strength, accompanied by volume shrinkage. The low water-to-binder ratio of modern high-performance concrete, as well as the use of mineral ultrafine powder and high-efficiency water reducer, further aggravate the self-shrinkage and drying shrinkage of concrete, and the shrinkage stress will cause cracks in concrete and reduce structural strength. , affecting the durability of concrete and shortening the service life of the building. For the shrinkage cracking of concrete, the main solutions at prese...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F236/04C04B24/26
CPCC04B24/2694C08F283/065C08F220/282
Inventor 郑娇玲佟莉周铁柱黄庆黄立军王爱军
Owner 江苏超力建材科技有限公司
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