Ketene concrete glue reducing agent and preparation method thereof

Abstract

The invention discloses a ketene concrete glue reducing agent and a preparation method thereof. The ketene concrete glue reducing agent is prepared from the following substances in parts by weight: 8-25 parts of dimethylacrylic acid, 8-20 parts of ketene monomer, 3-10 parts of ethylene glycol, 2-8 parts of retarder, 0.5-3 parts of initiator and the balance of water. According to the invention, theworking performance of the concrete can be improved, specifically, the cement can be more fully dispersed in the concrete, and the utilization rate of the cement is higher so that the early strengthand the later strength of the concrete are remarkably improved; in addition, the later toughness and the crack resistance of the concrete are also improved. Because the glue reducing agent has the effects of improving the strength and crack resistance of the concrete, on the premise of keeping the strength of the concrete unchanged in engineering operation, the cement consumption of concrete per unit volume can be reduced, and the service life of a concrete building is prolonged so that the engineering cost is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a ketene-based concrete adhesive reducer and a preparation method thereof. Background technique [0002] In recent years, my country's construction industry has achieved unprecedented development. With the renewal and improvement of infrastructure, the scale of construction has never been greater. Concrete among building materials has been widely used in civil engineering construction due to its abundant raw materials, low price, simple production process, and wide range of compressive strength grades. Cement is the main component of concrete and also the most expensive part of concrete. According to a large number of studies, there are still 10% to 15% of cement in concrete that has not been completely dispersed and hydrated, resulting in the inability to fully play its due role. If the hydration rate of cement can be increased, it will save a lot of engineering cos...

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Problems solved by technology

[0004] In the patent application publication CN110845672A, a polycarboxylic acid-based concrete adhesive reducer is reported, which is produced by polymerization of polyether macromonomers, unsaturated carboxylic acids, modified alcohol amines, etc., and often occurs in the actual preparation process. Side reactions occur, resulting in unstable effect of the glue reducer, and this kind of glue reducer is only compatible with polycarboxylate water reducer, which limits its scope of use

[0005] Patent application publication CN110903435A reports a glue reducer and its preparation method, which uses a common water reducer in the market as a matrix to form a polymer with a high molecular structure under the action of an unsaturated carboxylic acid and a sugar compound. It does improve the early strength of concrete, but does not significantly improve the later strength of concrete

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