Admixture for inhibiting bleeding of fabricated concrete and preparation method of admixture

Abstract

The invention discloses an admixture for inhibiting bleeding of fabricated concrete and a preparation method of the admixture. The concrete admixture is prepared from the following raw materials: 150-250 parts of a polycarboxylic acid component, 5-20 parts of a bleeding regulator and 730-845 parts of water. The invention further provides the preparation method of the concrete admixture. The preparation method comprises the following technological steps: 1), adding the bleeding regulator into water, and stirring for a proper time until the bleeding regulator is dissolved to obtain a transparentsolution; 2), adding the polycarboxylic acid component into the solution, and stirring for a proper time to obtain the concrete admixture. The concrete admixture prepared with the preparation methodprovided by the invention can eliminate delayed bleeding of fresh concrete so as to guarantee the appearance quality of a fabricated concrete member; meanwhile, the admixture has high adaptability tocement, strong water-reducing and distributing ability and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to an admixture for suppressing bleeding of assembled concrete and a preparation method thereof. Background technique [0002] The development of prefabricated buildings has become a national policy of my country's construction industry. The State Council issued a notice on the guidance on vigorously developing prefabricated buildings (Guobanfa [2016] No. 71). Opinions require the active development of prefabricated concrete structures. The Ministry of Housing and Urban-Rural Development has made more explicit requirements: by 2020, the proportion of prefabricated buildings in the country will account for more than 15% of new buildings, and more than 50 prefabricated building demonstration cities, more than 200 prefabricated building industrial bases, and more than 500 prefabricated building demonstrations will be cultivated. Engineering, building more than ...

AI Technical Summary

Problems solved by technology

[0007] Compared with ordinary bleeding, the adverse effect of delayed bleeding is greater, because the phenomenon of delayed bleeding occurs within 1 hour or longer after construction, it is difficult to detect in time, and the generation of delayed bleeding can cause concrete surface to appear Swelling, while forming quicksand and water lines on the side of the component, seriously weakening the appearance quality of the surface of the concrete component

[0008] Patent CN103992057B discloses a method to solve concrete hysteresis bleeding, the research is by compounding water-retaining material (one of polyvinyl alcohol, carboxymethyl cellulose, and methyl cellulose) into polycarboxylate water reducer and sodium sulfate to inhibit the delayed bleeding of concrete. From its public documents, it is found that this method mainly focuses on solving the delayed bleeding of concrete mixture after 1 hour, and has not done any research on the bleeding of concrete mixture after a long time However, any bleeding phenomenon of freshly mixed concrete before the initial setting (generally 8-9 hours after mixing) will affect the appearance quality of the concrete after formwork removal

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