Calcium silicate hydrate crystal nucleus early-strength polycarboxylic acid water reducer and preparation method thereof

Abstract

The invention discloses a calcium silicate hydrate crystal nucleus early-strength polycarboxylic acid water reducer and a preparation method thereof, and the calcium silicate hydrate crystal nucleus early-strength polycarboxylic acid water reducer is prepared from the following components in parts by weight: 480-500 parts of polyether macromonomer, 45-60 parts of silane coupling agent, 45-60 parts of small monomer, 60-80 parts of crystal nucleus solution, 1-3 parts of initiator, 1-3 parts of reducing agent, and 4-6 parts of a molecular weight regulator. According to the invention, the silane group is grafted to the main chain of the polycarboxylic acid water reducer, and then chemical adsorption is generated by utilizing the condensation effect of the hydrolyzed silane group and the hydroxyl group on the surface of the hydrated calcium silicate without occupying the adsorption site of the polycarboxylic acid water reducer. The crystal nucleus early strength type polycarboxylic acid water reducer jointly acts on the surfaces of cement particles through covalent bonds, hydrogen bonds, Van der Waals' force and the like, has a very strong seed crystal effect on cement hydration while giving full play to the water reducing effect, remarkably promotes the early strength development of mortar or concrete, and overcomes the defects in the prior art.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a calcium silicate hydrate crystal nucleus early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The emergence of concrete admixtures, especially the invention of high-performance polycarboxylate superplasticizers, has greatly improved the performance of concrete and promoted the continuous development of concrete technology. As we all know, polycarboxylate water reducer has the characteristics of low dosage, high water reducing rate, wide adaptability, small slump loss and excellent concrete durability. However, while having excellent performance, the polycarboxylate superplasticizer also significantly delays the hydration of cement, affects the development of early strength, and limits its use in winter engineering and cold environments. In the production of prefabricated components, the retarding effect length...

AI Technical Summary

Problems solved by technology

This patent still uses the physical blending of nano crystal nucleus early strength agent and polycarboxylate superplasticizer. After the polycarboxylate superplasticizer sacrifices the group in the molecular structure to adsorb nanocrystal nucleus, the adsorption capacity of cement particles is reduced. It will reduce, and then affect the dispersion and adsorption effect of polycarboxylate superplasticizer on cement slurry

Images