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A kind of concrete air-entraining agent and preparation method thereof

An air-entraining agent and concrete technology, applied in the field of concrete additives, can solve the problems of poor bubble stability and great influence on concrete hardening strength, and achieve the effects of preventing agglomeration, reducing steric hindrance effect and high foam strength

Active Publication Date: 2020-12-18
四川宏业商品混凝土有限公司
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a concrete air-entraining agent and its preparation method in view of the poor stability of air bubbles in the current concrete air-entraining agent and the great influence on the hardening strength of concrete

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  • A kind of concrete air-entraining agent and preparation method thereof

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preparation example Construction

[0026] The preparation method of surfactant:

[0027] Take erucamide and add n-propanol at a mass ratio of 1~5:10~30, stir and mix at 45~50°C for 20~30min, add dropwise 37% hydrochloric acid with a mass fraction of 1~1.5 times the mass of erucamide, and control Add dropwise for 30-50 minutes, stir and mix for 20-30 minutes, then add epichlorohydrin with 80-95% erucamide mass, raise the temperature to 70-75°C and stir and mix for 2-4 hours to obtain a stirred mixture. Take the stirred mixture by mass Ratio 2~5: 1~4, add hydroxypropyl guar gum, stir and mix at 5000r / min for 30~60s to obtain surfactant.

[0028] The preparation method of foam stabilizing additive is:

[0029] (1) Take chitosan and add isopropanol according to the mass ratio of 1~3:40~50, let it stand for 1~3h, add 20~30% of isopropanol mass fraction and 30% sodium hydroxide solution, in Stir and mix at 25~30°C for 1~4h to obtain the stirred mixture a. Take 2,3-epoxypropyl sulfonic acid and add isopropanol in a ...

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Abstract

The invention discloses a concrete air entraining agent and a preparation method thereof and belongs to the field of concrete additives. According to the concrete air entraining agent, erucylamide, hydrochloric acid and the like are used as raw materials to synthesize a long-carbon-chain cationic surfactant to reduce the surface tension; then isopropanol is used as a solvent to react, and gas generated in a hydration process can be uniformly squeezed and entrained, so that the compactness is improved; polyaspartic acid is modified through fumaric acid and carboxylic acid and amide groups are introduced so that the air entraining efficiency is improved; and polyethylene vinyl acetate and polyvinyl versatate are added and can form a film when meeting water, so that the bending strength and permeability resistance of mortar are improved and the whole performance in an concrete air entraining process is improved. According to the concrete air entraining agent, foam is formed through the surfactant to close pores, so that the compactness and the water resisting performance are improved. By adopting the concrete air entraining agent, the problems of a current concrete air entraining agent that the foam stability is poor and the influence on the hardening strength of concrete is great are solved.

Description

technical field [0001] The invention belongs to the field of concrete additives, in particular to a concrete air-entraining agent and a preparation method thereof. Background technique [0002] The freeze-thaw damage and salt freeze damage of concrete buildings and various structures, roads and marine engineering have always been the focus of people's attention. Studies have shown that adding an appropriate amount of air-entraining agent in the concrete preparation process, introducing and retaining an appropriate amount of air bubbles with small sizes and reasonable structures in the concrete is the most important measure to greatly improve the freeze-thaw cycle resistance of concrete and increase the durability index. [0003] Concrete air-entraining agent can effectively improve the workability of concrete, reduce the bleeding performance, and greatly improve the anti-freeze and anti-seepage performance of concrete. Concrete roads and bridges with ice and salt are especi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B24/16C04B24/28C04B103/30C04B103/48C04B103/40
CPCC04B24/168C04B24/287C04B24/38C04B40/0039C04B2103/304C04B2103/404C04B2103/48C04B24/383C04B24/2623C04B24/286C04B24/045C04B22/068C04B24/16C04B24/023
Inventor 战英权路芸庞成荣
Owner 四川宏业商品混凝土有限公司
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