Slow-release concrete water-retaining agent and preparation method thereof

Abstract

The invention discloses a slow-release concrete water-retaining agent and a preparation method thereof. The water-retaining agent is prepared from the following raw materials: 30-35 parts of an acrylamide monomer, 15-20 parts of a slow-release monomer, 0.18-0.21 part of an initiator and 3000-3800 parts of deionized water. The acrylamide monomer is one or two of acrylamide and 2-acrylamide-2-methylpropanesulfonic acid; the slow-release monomer is one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate; and the initiator is one of azodiisobutyronitrile, azodiisobutylamidine hydrochloride and azodiisobutylimidazoline hydrochloride. The invention also provides the preparation method of the water-retaining agent. The water-retaining agenthas slow release property, is especially effective for concrete bleeding and large fluidity later stage, can continuously improve the cohesiveness of concrete, has good flow velocity performance, is simple in preparation process, and can be used in constructional engineering of high-standard concrete, concrete in severe cold regions and ultrahigh pumping concrete.

Description

technical field [0001] The invention relates to a concrete water-retaining agent, in particular to a slow-release concrete water-retaining agent. The invention also relates to a preparation method of the slow-release concrete water-retaining agent. Background technique [0002] Concrete with good workability is conducive to concrete construction, to the increase of mechanical properties, and to hardening to increase the aesthetics of concrete. However, in concrete mixing, the phenomenon that the slurry sinks, the coarse aggregate is exposed, and the edge oozes yellow slurry often occurs, that is, the phenomenon of concrete bleeding. Bleeding in concrete mixing can be improved by adding common water retaining agents, such as cellulose, wenlun glue, etc. However, the bleeding caused by the increase of concrete fluidity with time, that is, the delayed bleeding of concrete, is difficult to solve by using the above water retaining agents. [0003] At present, the concrete wate...

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Problems solved by technology

[0005] The above technologies are especially effective for how to make the concrete water-retaining agent have slow-release properties, and it is especially effective for concrete bleeding and fluidity in the later stage. It can continuously improve the cohesion performance of concrete, has good flow rate performance, and the preparation process is simple. No specific instructions are given. mentoring program

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