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A kind of concrete internal curing agent, its preparation method and application method

An internal and curing agent technology for concrete, which is applied in the field of concrete internal curing agent, can solve the problems of wasting water resources, manpower and material resources, large changes in slump over time, unable to meet construction requirements, etc., so as to promote sustainable development of resources and reduce later stages Maintenance cost and effect of saving maintenance water

Inactive Publication Date: 2015-10-21
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional concrete curing methods mainly include covering wet sacks, wet straw bags or piles of wet sand before sprinkling water, etc., which not only wastes a lot of water resources, manpower and material resources, but also cannot satisfy the beams and columns of high-rise buildings, large buildings and water-deficient and arid areas. construction requirements
The internal curing method of concrete advocated at present is mainly the chemical curing method, but this method often has poor compatibility with cement, low water reducing rate, large change in slump over time, excessive air entrainment, and is not economical. And other issues

Method used

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  • A kind of concrete internal curing agent, its preparation method and application method
  • A kind of concrete internal curing agent, its preparation method and application method
  • A kind of concrete internal curing agent, its preparation method and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Formula: 47.6% deionized water, 22.4% acrylic acid, 5% sodium hydroxide, 17.9% sodium persulfate, 0.3% N'N-methylenebisacrylamide, 6.8% kaolin.

[0030] Preparation:

[0031] First dissolve sodium hydroxide in deionized water, then mix it with acrylic acid evenly, and control the temperature of the mixture below 50°C; then add sodium persulfate, N'N-methylenebisacrylamide and kaolin in sequence, and stir Uniform, microwave treatment in a microwave oven with a microwave power of 270W for 2 minutes, you can get the expansion of the concrete internal curing agent; soak the obtained expansion in alcohol that has not passed the surface of the expansion for 30 minutes, and then put it into an oven with a constant temperature of 80 degrees to Dry at 100°C for 8 hours to obtain a bulky concrete internal curing agent; crush the bulky concrete internal curing agent with a pulverizer, and then sieve it with an 80-mesh sieve to obtain a concrete internal curing agent with a mesh nu...

Embodiment 2

[0033] Formula: 47.8% deionized water, 22.1% acrylic acid, 5.5% sodium hydroxide, 17.7% sodium persulfate, 0.3% N'N-methylenebisacrylamide, 6.6% kaolin.

[0034] The preparation method was the same as in Example 1, and an 80-mesh concrete internal curing agent was prepared.

Embodiment 3

[0036] Formula: 48% deionized water, 21.7% acrylic acid, 6.1% sodium hydroxide, 17.4% sodium persulfate, 0.3% N'N-methylenebisacrylamide, 6.5% kaolin.

[0037] The preparation method was the same as in Example 1, and an 80-mesh concrete internal curing agent was prepared.

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Abstract

The invention discloses a concrete internal curing agent. The concrete internal curing agent is super absorbent resin which has intelligent water absorption and water release functions and stably exists in concrete for a long term. The concrete internal curing agent comprises deionized water, sodium hydroxide, acrylic acid, a water-soluble initiator, a water-soluble crosslinking agent and natural grafted skeleton kaolin which is calcined kaolin. The concrete internal curing agent disclosed by the invention is environmentallyenvironment-friendly, high-efficiency and convenient to use; the addition amount of the concrete internal curing agent is small; raw materials for preparation are low in cost; and by adopting the concrete internal curing agent, the water consumption of fresh mixed concrete can be obviously reduced, the concrete property is improved, and the service life of the concrete is prolonged.

Description

technical field [0001] The invention belongs to the field of concrete engineering, and in particular relates to a concrete internal curing agent, a preparation method and a use method thereof. Background technique [0002] In the actual construction of concrete, concrete curing is a very important link. The strength of concrete largely depends on the degree of cement hydration, and cement hydration can only occur in the capillary filled with water. Therefore, conditions must be created to prevent water from evaporating and losing in the capillary, so that the cement can be fully hydrated. Ensure that the strength of concrete continues to grow. Otherwise, in a dry environment, the cement hydration will stop with the gradual evaporation of water, and cause concrete shrinkage cracks and structural looseness, which will seriously affect the strength and durability of concrete. Therefore, it is extremely important to create a moist and water-retaining environment for the mainte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/28
Inventor 邢锋董必钦王琰帅冼向平林芳竹杨博乾陈春桃黄诗嶸郑素君李智裕陈立
Owner SHENZHEN UNIV
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