Superplasticizer for facilitating cement hydration, preparation method thereof and application

Abstract

The invention provides a superplasticizer for facilitating cement hydration. The superplasticizer is prepared by free radical copolymerization reaction of a monomer a, a monomer b, a monomer c and a modified monomer d, wherein the modified monomer d is prepared by a reaction of a monomer d and nanometer SiO2; the viscosity average molecular weight of the superplasticizer is controlled to be in a range from 30,000 to 80,000. The invention further provides a preparation method of the superplasticizer and application of the superplasticizer in promotion of the cement hydration. The preparation process of the superplasticizer is simple, the use is convenient, and the cost is low; the superplasticizer is prepared by importing superlong side chain polyester, zwitter ions and nanometer particles and can remarkably facilitate early-stage hydration of cement, so that the compressive strength of concrete is improved; furthermore, at room temperature or low temperature, the early-stage reinforcement effect is greatly remarkable, and the middle-stage and later-stage strength is stably improved; besides, the superplasticizer has stronger adaptability for materials, and is suitable for low-temperature large-mixing-amount mineral admixture concrete and prefabricated part concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and particularly relates to a superplasticizer capable of promoting cement hydration and a preparation method thereof. The superplasticizer can significantly improve the early strength of concrete. Background technique [0002] Polycarboxylate graft copolymer admixtures have been widely used in large-scale infrastructure such as nuclear power, water conservancy, high-speed rail, subway, bridges, and tunnels. However, the graft copolymer admixtures currently on the market can delay the hydration of cement to a certain extent, especially when the curing temperature is low. Due to its slow development of early strength, its use in cold climates is limited. In addition, the durability of concrete has attracted more and more attention from construction engineers. A large number of mineral admixtures have been applied to concrete to improve the environmental erosion resistance of concrete. ...

AI Technical Summary

Problems solved by technology

Concrete components cured by steam not only decline in mechanical properties in the later stage, but also reduce the durability of components

4) Early-strength technology based on nano-materials: Adding nano-silica or nano-calcium carbonate to concrete provides the crystal nuclei required for cement hydration and accelerates cement hydration, which can penetrate into hardened cement paste and coarse aggregates. The small gaps in the material interface, thereby reducing the porosity, making the hardened concrete denser and stronger, but the individual nanoparticles are easy to agglomerate, and there are certain difficulties in mixing uniformly in the cement; 5) Based on the regulation of the molecular structure of the graft copolymer super early strength technology

However, the early-strength effects of these early-strength admixtures are unsatisfactory, and it is difficult to meet the needs of concrete wit

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