Concrete early strength agent, early strength concrete and preparation method of early strength concrete

Abstract

The invention discloses a concrete early strength agent, an early strength type concrete and a preparation method of the early strength concrete. The concrete early strength agent is prepared from, by mass, 70-80% of a component A and 20-30% of a component B, the component A is a liquid mixture and comprises, by weight, 10-24 parts of silica sol dispersion liquid, 10-15 parts of siloxane emulsion, 2-4 parts of a surfactant, 8-15 parts of soluble calcium salt and 4-5 parts of alcamines; the silica sol dispersion liquid is a dispersion liquid of three substances, namely nanoscale silicon dioxide, a dispersing agent and a suspending agent, in water, and the dispersing agent accounts for 0.5-2% of the solvent water; the suspending agent accounts for 0.5-1% of the solvent water, and the nanoscale silicon dioxide accounts for 55-70% of the solvent water; and the component B is a solid mixture and comprises,s by weight, 30-40 parts of meta-aluminate, 20-30 parts of silicate, 20-30 parts of lithium salt, 2-10 parts of calcium tartrate and 0.5-1 part of methyl cellulose ether. The superposition effect of different early strength components can be exerted, the setting and hardening speed of cement is accelerated, the precipitation of hydration products is promoted, and the early strength of concrete can be obviously improved in a low-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for rapidly improving the early strength of concrete in a low-temperature environment. Background technique [0002] With the rapid development of the modernization of the domestic construction industry, the market demand and quality and technical requirements for concrete prefabricated components are gradually increasing. Concrete prefabricated components refer to pouring and curing concrete components in the factory, and then assembling and constructing them on site. In order to speed up the turnover rate of molds and improve the production efficiency of products at low temperature, it is an important technical way to improve the early strength of precast concrete. At present, relevant enterprises basically use steam curing technology to speed up the hydration reaction of concrete, but it consumes a lot of energy, increases production costs, and...

AI Technical Summary

Problems solved by technology

However, it is easy to cause nanoparticle aggregation and precipitation, and it cannot exist stably for a long time, which brings certain difficulties to the application of crystal nucleus class early strength agent. As CN110330257, a kind of nano C-S-H gel crystal nucleus early strength agent is made of tricalcium silicate, Ion promoters, surface modifiers and dispersion stabilizers are prepared by wet grinding process

However, the preparation process of the nano C-S-H gel crystal nucleus early strength agent is cumbersome, the process conditions are strict, and the process parameters are difficult to control, and the synthesized C-S-H gel has poor stability, and the effect of improving the strength of concrete in the later stage is not obvious.

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