Autodensing concrete using polycarboxylic acid series additive and its technology

Abstract

This invention relates to a self-compacting concrete that using polycarboxylate additive agent, mixed by aggregate, cementitious materials, additive agent and water. According to weight, sand rate of 45%, the total amount of slag and fly ash mixture is more than 30% of the total cementitious Materials, the water-cement ratio is not more than 0.4; select ordinary silicate cement of no less than 42.5; slag and fly ash ratio of 1:1; the Polycarboxylate, polyethylene oxide chain length of 10 ~ 300 Moore, the molar ratio of allyl part of 1 / 9 to 6 / 9, molecular weight of polymer is 30,000 to 80,000. It's Process: aggregate and cementitious materials by dry mixing 20 seconds later, add water and additive agent, wet mixing 00seconds then release concrete.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a polycarboxylic acid-based admixture, which has the advantages of low dosage, high plasticization, good slump retention, wide cement adaptability, high water-reducing efficiency and simplified construction constraints. Self-compacting concrete. Background technique [0002] The emergence of self-compacting concrete originated from the durability problems of concrete structures encountered in Japan in the years after 1983 and the decline in the quality of concrete due to the reduction of skilled workers. In 1986, scholars at the University of Tokyo proposed the necessity of developing self-compacting concrete. In 1988, it was the first time in Japan to prepare self-compacting concrete with materials purchased from the building materials market. In the second year, the University of Tokyo conducted public experiments in front of more than 100 researchers. The results h...

AI Technical Summary

Problems solved by technology

Although the development of a new generation of polycarboxylic acid-based admixtures has provided convenience for the preparation of high-strength self-compacting concrete, how to achieve high compactness and high filling performance, and how to achieve the unity of fluidity and separation resistance of vibration-free concrete? This is a problem that must be solved in actual production

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