Additive for rock-fill concrete production

Abstract

The invention relates to the field of concrete admixtures, in particular to a synthetic method of an admixture for rockfill concrete production. The admixture for rock-fill concrete production is prepared from the following components in parts by weight: 300-380 parts of methyl allyl polyoxyethylene ether; 3-47 parts of acrylic acid; 1.0 to 55 parts of hydroxyethyl acrylate; 1.0 to 15 parts of acrylamide; 5 to 40 parts of 2-acrylamide-2-methallyl sulfonic acid; 5 to 20 parts of dimethyl diallyl ammonium chloride; 1-8 parts of hydrogen peroxide; 0.2 to 2.0 parts of a reducing agent; 0.5 to 2.6 parts of mercaptopropionic acid; and 400 to 641.6 parts of deionized water. The admixture for rockfill concrete production is excellent in performance, the use amount of a cementing material can be reduced, the problem that an existing admixture is poor in adaptability to rockfill concrete and gravel is solved, the admixture has good water reducing performance and plasticity maintaining performance, the use amount of the water reducing agent can be reduced during compounding, and a mixture is good in performance, free of bleeding and free of bottom grabbing; the water reducing agent has certain water reducing property, the use amount of the water reducing agent is reduced when the water reducing agent is compounded, and the use effect is good; the consumption is small and the cost is saved; and the method is environment-friendly.

Description

Technical field [0001] The invention relates to the field of concrete admixtures, and in particular to an admixture used for the production of rock-fill concrete. Background technique [0002] The admixture for rockfill concrete production is a new type of high-performance admixture, which is a compound product of carboxylic acid grafted multi-component copolymer. Its characteristics are low dosage, high water reduction rate, small slump loss rate over time, and can improve the bleeding phenomenon of concrete. However, the admixtures currently on the market for the production of rock-fill concrete are large in dosage and have poor adaptability to rock-fill concrete and sand and gravel of different qualities. They need to be used in combination with water-reducing agents, defoaming agents, etc., and the method is complicated. . Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art and propose an admixture ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and proposes a kind of admixture used for rockfill concrete production, which can reduce the amount of cementitious material, the amount is less, the water-reducing rate is high, and the plastic-retaining effect is good; Add small monomers such as acrylamide, 2-acrylamide-2-methylpropenesulfonic acid, and dimethyl diallyl ammonium chloride to improve the steric hindrance effect and electrostatic attraction of polycarboxylic acid, and reduce the external The adsorption of the admixture to sand and gravel mud improves the poor adaptability of existing admixtures to rockfill concrete and sand and gravel

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