Compound admixture for bare concrete and bare concrete

Abstract

The invention relates to a compound admixture for bare concrete and the bare concrete, belonging to the technical field of concrete materials. The compound admixture for the bare concrete is preparedfrom a polycarboxylate copolymer, an anionic surfactant, a nonionic surfactant, an activator, a buffer solution, sodium gluconate, polyoxyethylene polyoxypropylene ether, tetramethylurea, polyethyleneglycol and water. The bare concrete is prepared by mixing the compound admixture for the bare concrete, cement, fly ash, sand, stones and water. After being mixed with the concrete, the compound admixture for the bare concrete can improve the fluidity without increasing the bleeding rate of the concrete, and prolongs the time interval between initial setting and final setting, thus enabling the concrete to have the advantages of being low in bleeding rate, high in fluidity and long in time interval between initial setting and final setting.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a composite admixture for clear-water concrete and clear-water concrete. Background technique [0002] Fair-faced concrete is a concrete that directly uses the natural texture of concrete as a finishing effect. With the development of my country's fair-faced concrete technology, fair-faced concrete is gradually being used in the construction of subways, high-speed railways, highways, bridges and culverts, high-rise buildings, and water conservancy dams. Compared with ordinary concrete, fair-faced concrete requires uniform, smooth surface color, no honeycomb pitting, and no bump damage. Since the fair-faced concrete structure does not require decoration, it saves processes such as paint and finishing, greatly reduces construction waste, and is conducive to protecting the environment. Tests have shown that adding various additives to concrete, such as water reducers, e...

AI Technical Summary

Problems solved by technology

However, in actual use, although some additives can improve the fluidity of concrete, it is easy to increase the bleeding rate of concrete; although some additives can reduce the bleeding rate of concrete, it is easy to cause the problem that the time interval between the initial setting and final setting of concrete is short , affecting the smoothness and flatness of the fair-faced concrete surface

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