Super-retarding concrete and preparation method thereof

Abstract

The invention discloses super-retarding concrete and relates to the technical field of building materials. According to the key pint of the technical scheme, the super-retarding concrete comprises thefollowing ingredients (by weight): 150-190 parts of water, 320-360 parts of cement, 635-675 parts of sand, 920-1140 parts of cobblestone, 65-95 parts of an admixture A, 92-120 parts of an admixture B, 37-59 parts of gypsum, and 5.5-8.3 parts of an additive. The additive comprises the following ingredients (by weight): 12-16 parts of a retarder and 38-52 parts of a polycarboxylate superplasticizer. The admixture A comprises fly ash, and the admixture B comprises mineral powder. The retarder is composed of sodium thiosulfate, glycerol and sodium tripolyphosphate according to the mass ratio of 1-3: 2.4-3.5: 2.3-3.2. The problem that concrete's short setting time and low long-term strength are hard to meet the requirement of prolonging the setting time of concrete and guaranteeing long-term strength is solved. By using the retarder and the polycarboxylate superplasticizer cooperatively, the setting time of concrete can be prolonged, and the concrete can have high long-term strength.

Description

technical field [0001] The invention relates to the technical field of building materials, 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 document with the authorized announcement number CN1041711C, which discloses a super-dry mixed concrete and its preparation method, which contains a concrete high-efficiency water-reducing admixture, and the admixture contains one or more selected From the cement dispersant (A) of lignosulfonate, oxidized carboxylate and polycarboxylate, when lignosulfonate or oxidized carboxylate is selected, its content is the total solid phase of cement or cement and fly ash 0.15-0.80% by ...

AI Technical Summary

Problems solved by technology

[0004] Although the existing ultra-dry mixed concrete and its preparation method have a good curing effect, the addition of lignin sulfonate, due to the nature of introducing air, has a small increase in the compressive strength of the concrete, 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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