Formula and preparation method of self-compacting concrete admixture

Abstract

The invention discloses a formula and a preparation method of a self-compacting concrete admixture. The self-compacting concrete admixture comprises the following components in percentage by mass: 5-7% of a polycarboxylate superplasticizer 001, 6-8% of a polycarboxylate superplasticizer 002, 24-28% of a polycarboxylate superplasticizer 004, 0.5-2.5% of anhydrous sodium sulphate, 0.5-2.5% of sodiumhexametaphosphate, 0.5-2.5% of borax, 0.1-0.5% of caustic soda and 0.05-0.1% of a water-retaining agent. According to the invention, compared with other common admixtures, the admixture of the invention has the advantages that the concrete subjected to trial mixing is smooth in surface and free of honeycombs and pitted surfaces, the viscosity of the concrete is reduced, the workability of the concrete is enhanced, the slump time-dependent loss of the concrete is basically avoided, the concrete is good in self-compaction, high in flowability and free of vibration, and the excellent effects ofhigh-layer pouring, no requirement of steam curing, smooth concrete structure surface, no pore on the concrete surface, high strength and the like can be achieved.

Description

technical field [0001] The invention relates to a formula of an admixture and a preparation method thereof, in particular to a formula of an admixture of self-compacting concrete and a preparation method thereof. Background technique [0002] Concrete is a general term for engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Concrete usually refers to the cement concrete obtained by mixing, molding and curing with water, admixtures and admixtures in a certain proportion, using water gel as the cementitious material, sand and stone as the aggregate, and water, admixtures and admixtures, also known as Ordinary concrete, which is widely used in civil engineering; concrete has the characteristics of abundant raw materials, low price, and simple production process, but traditional concrete has poor fluidity when pouring products, and concrete itself is a multiphase, containing gas, liquid, and solid Mixed substances, so the tra...

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Problems solved by technology

Concrete usually refers to the cement concrete obtained by mixing, molding and curing with water, admixtures and admixtures in a certain proportion, using water gel as the cementitious material, sand and stone as the aggregate, and water, admixtures and admixtures, also known as Ordinary concrete, which is widely used in civil engineering; concrete has the characteristics of abundant raw materials, low price, and simple production process, but traditional concrete has poor fluidity when pouring products, and concrete itself is a multiphase, containing gas, liquid, and solid Mixed substances, so the traditional concrete has poor fluidity, high viscosity, large and many bubbles, so that it cannot achieve self-compacting during the pouring process, and needs vibration to assist, especially when throwing at high altitude. Traditional concrete needs high-temperature steaming In order to improve its performance, the products made by traditional concrete pouring may have internal defects, which make the product uneven and discontinuous, so that the quality of the poured products varies greatly, and the appearance of the product is relatively rough; in addition, the traditional concrete has a small slump, and The slump retention time is short, and if it is not used in time, it will affect its use effect; this will directly cause defects in the appearance and internal quality of the product made of concrete

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