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Modified early strength agent

An early-strength agent and modification technology, applied in the field of concrete admixtures, can solve the problems of corrosion of steel bars, strength attenuation of cement paste, etc., and achieve the effects of improving early strength, early strength and late strength, and steric hindrance effect.

Inactive Publication Date: 2018-05-01
浙江广天构件集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a modified early-strength agent in view of the disadvantages of the early-strength agent obtained by compounding in the prior art that tends to attenuate the later strength of the cement paste and cause steel bar corrosion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A modified early strength agent is made of the following raw materials in parts by weight:

[0017]

[0018] The modified functional monomer includes 17 parts of acrylamide, 10 parts of sodium dodecylbenzene sulfonate, 18 parts of sodium methallyl sulfonate and 22 parts of polyε-caprolactone diol.

[0019] The molecular weight regulator is mercaptopropionic acid. The addition of the molecular weight regulator is mainly to control the excessively large molecular weight and cause the molecular weight distribution to be too wide to prevent crosslinking.

[0020] The reducing agent is hang white block.

[0021] The mass percent concentration of hydrogen peroxide is 30%.

Embodiment 2

[0023] A modified early strength agent is made of the following raw materials in parts by weight:

[0024]

[0025]

[0026] The modified functional monomer includes 20 parts of acrylamide, 15 parts of sodium dodecylbenzenesulfonate, 20 parts of sodium methallylsulfonate and 25 parts of polyε-caprolactone diol.

[0027] The molecular weight regulator is mercaptopropionic acid. The addition of the molecular weight regulator is mainly to control the excessively large molecular weight and cause the molecular weight distribution to be too wide to prevent crosslinking.

[0028] The reducing agent is hang white block.

[0029] The mass percent concentration of hydrogen peroxide is 20%.

Embodiment 3

[0031] A modified early strength agent is made of the following raw materials in parts by weight:

[0032]

[0033] The modified functional monomer includes 15 parts of acrylamide, 10 parts of sodium dodecylbenzenesulfonate, 15 parts of sodium methallylsulfonate and 20 parts of polyε-caprolactone diol.

[0034] The molecular weight regulator is thioglycolic acid. The addition of the molecular weight regulator is mainly to control the excessively large molecular weight and cause the molecular weight distribution to be too wide to prevent crosslinking.

[0035] The reducing agent is L-ascorbic acid.

[0036] The mass percent concentration of hydrogen peroxide is 40%.

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Abstract

The invention relates to the field of concrete admixtures, and discloses a modified early strength agent as well as a synthesis method thereof. The modified early strength agent comprises the following components in parts by weight: 300-350 parts of polyprenol polyoxyethylene ether, 30-50 parts of acrylic acid, 60-80 parts of modified functional monomer, 2-4 parts of hydrogen peroxide, 1-1.5 partsof reductive agent, 2-2.5 parts of molecular weight modifier, 10-20 parts of sodium hydroxide, and 500-600 parts of water, wherein the modified functional monomer comprises 15-20 parts of acrylamide,10-15 parts of sodium dodecyl benzene sulfonate, 15- 20 parts of sodium methallylsulfonate, and 20-25 parts of poly epsilon-caprolactone diol. The modified early strength agent contains multiple functional functional groups, so that early strength of concretes can be improved, turnover of molds is accelerated, and production of pipelines is accelerated; and the modified early strength agent has ahigher water reducing rate, a lower gas content, and higher early strength performance than conventional early strength agents, and does not contain sulfates, so that the modified early strength agent will not crack.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a modified early strength agent. Background technique [0002] The early strength agent refers to the admixture that can improve the early strength of concrete and has no significant effect on the later strength. The main function of the early strength agent is to accelerate the hydration speed of cement and promote the development of early strength of concrete; it not only has the function of early strength, but also has a certain function of water reduction and enhancement. [0003] Commonly used accelerators can be divided into three categories: strong electrolyte inorganic salts, water-soluble organic substances, and composite accelerators composed of organic and inorganic substances. Strong electrolyte inorganic salts mainly include chloride salts, sulfates, and nitrates. Chloride salts have good effects. They can not only improve the early strength of concrete, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F283/02C08F220/06C08F220/56C08F228/02C04B24/16C04B103/10
CPCC08F283/065C04B24/165C04B2103/10C08F283/02C08F220/06C08F220/56C08F228/02
Inventor 李事力陈阳怡祝基周宇杰
Owner 浙江广天构件集团股份有限公司
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