Super-retarded concrete and preparation method thereof

Abstract

The invention discloses super-retarded concrete and a preparation method thereof. The super-retarded concrete is prepared from the following raw materials in parts by weight: 165-180 parts of water, 280-335 parts of cement, 565-620 parts of sand, 990-1200 parts of stone, 70-85 parts of flyash, 85-110 parts of mineral powder and 7.8-9.4 parts of an additive, wherein the additive is prepared from aretarder and a water reducer according to a mass ratio of 1 to (3.5-4.1). The retarder is prepared from the following components in parts by weight: 10-15 parts of phosphogypsum, 70-100 parts of water, 26-38 parts of a titanate coupling agent, 80-90 parts of an ammonium hydroxide solution with a mass fraction of 15-20%, 28-34 parts of absolute ethyl alcohol with a mass fraction of 20-35% and 20-40parts of polypropylene. The preparation method of the super-retarded concrete comprises the following steps: S1, adding the water reducer and a defoamer into water and fully mixing to obtain a firstmixture; S2, fully mixing corresponding parts by weigh of cement, stone, sand, flyash and mineral powder to form a second mixture; and S3, adding the first mixture into the second mixture, uniformly stirring, then adding the retarder and fully mixing to form the super-retarded concrete. The super-retarded concrete has the advantages of long setting time and high later-stage strength.

Description

technical field [0001] The invention relates to the technical field of concrete preparation, more specifically, it relates to a super retarded concrete and a preparation method thereof. Background technique [0002] With the development of society and the needs of various large-scale projects, the application range of concrete is continuously expanding, and the performance requirements of concrete are also getting higher and higher. [0003] In the prior art, you can refer to the Chinese invention patent application document with the application publication number CN107473672A, which discloses a concrete and its preparation process, including the following components in parts by weight: 290-345 parts of cement; 870-945 parts of sand ; 750-900 parts of stone; 80-105 parts of fly ash; 56-88 parts of slag; 1-3 parts of polycarboxylate water reducer; 0.5-2 parts of expansion agent; 8 parts; 1-2 parts of defoamer; 145-170 parts of water; the cement is P.O42.5 cement; the additiv...

AI Technical Summary

Problems solved by technology

[0006] Although the existing ultra-dry-mixed concrete and its preparation method have a good curing effect, the addition of lignosulfonate, due to the nature of introducing air, increases the compressive strength of the concrete slightly, and the early strength is low, and The retarding time is short, it is difficult to meet the needs of prolonging the setting time of concrete and ensuring the strength of the late stage of setting

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