Retarded cement mixture and preparation process thereof

Abstract

The invention discloses a retarded cement mixture and a preparation process thereof, relates to the technical field of cement production and solves the problem of poor retarding effect when cement isprepared into concrete in the later period due to poor matching effect of retarding components in cement. The retarded cement mixture is prepared from components in parts by weight as follows: 50-65 parts of cement clinker, 15-28 parts of fly ash, 8-12 parts of mineral powder, 3-5 parts of fluorogypsum, 2.2-4 parts of aerogel, 2-3 parts of a mixed retarder and 0.8-2 parts of polyvinyl alcohol. Theprepared retarded cement mixture cannot set quickly when poured into concrete in the later period and has good retarding effect, the preparation process comprises simple steps and is convenient to operate, the retarded cement mixture obtained by the process has uniform particle size, the compactness of concrete can be increased, and the strength of the concrete can be improved.

Description

technical field [0001] The invention relates to the technical field of cement production, more specifically, it relates to a retarded cement mixture and a preparation process thereof. Background technique [0002] Cement refers to powdery hydraulic inorganic gelling material. It can become a slurry after adding water and stirring, and can be hardened in the air or better hardened in water, and can firmly bind sand, stone and other materials together. In the early years the mixture of lime and volcanic ash is very similar to lime pozzolanic cement, use it to glue concrete which made of crushed stone. After hardening, the cement not only has high strength, but also can resist the erosion of fresh water or salt water. [0003] In the Chinese invention patent with the publication number CN106316175A, a micro-expansion coagulated Portland cement is disclosed, which includes the following components in mass percentages: Portland cement clinker: 10% to 70%, industrial waste residu...

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Problems solved by technology

[0005] Aiming at the problem in the prior art that the retarding effect of the cement is not good when the cement is prepared into concrete due to the poor matching effect of the retarding component in the cement, the purpose of the present invention is to provide a kind of retarding cement mixture, by adding Airgel, mixing retarder and polyvinyl alcohol, to solve the above-mentioned technical problems, the concrete that the prepared retarded cement mixture of the present invention pours into in the later period is not easy to set quickly, and has good retarding effect

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