Pre-hydrated mineral powder nanocrystalline nucleus early strengthening agent for steam-curing concrete and preparation method thereof

Abstract

The invention relates to a pre-hydrated mineral powder nanocrystalline nucleus early strengthening agent for steam-curing concrete and a preparation method thereof. The early strengthening agent comprises, by mass, 20-30% of mineral powder, 2-3% of a surface modifier and 67-78% of deionized water. The surface modifier is a mixed solution containing a carboxylic acid-sulfonic acid polymer, a polycarboxylic acid water reducing agent and white sugar dissolved in water at a mass ratio of 1-3: 1-3: 1. The pre-hydrated mineral powder nanocrystalline nucleus early strengthening agent for steam-curingconcrete has strong induction effects on cement under steam-curing conditions. The early strengthening agent in a use ratio of 0.5-1.0% can improve the strength of ordinary Portland cement mortar by55-68% through steam-curing at 60 DEG C for 8h so that the early strength of steam-cured prefabricated components is significantly improved and the mold turnaround efficiency is improved. The early strengthening agent can be widely used in the steam-cured prefabricated component industry, greatly improve production efficiency and reduce energy consumption of the unit product.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a prehydrated mineral powder nano crystal nucleus early strength agent for steam-cured concrete and a preparation method thereof. Background technique [0002] my country's slag is the highest output of all industrial by-products, about 30 million tons per year. The slag finely ground slag is a polymer composed of glass phase and crystal phase. The crystal phase wraps the glass phase. The former is an inert component. Chemically very inactive, the latter is potentially reactive and hydraulically hard. Adding mineral powder to concrete as a concrete mineral admixture can reduce the cost of concrete and improve the durability and impermeability of concrete. [0003] During the hydration process of general mineral powder cement, because mineral powder replaces a part of cement clinker, the relative content of clinker that can participate in hydration in the e...

AI Technical Summary

Problems solved by technology

Because the activity of slag is too low, it takes a long time from its activity being stimulated to participating in hydration and forming a strong hydration product, so the hydration rate of cement after adding slag is greatly slowed down, so that it can reach It is less than the early strength requirement, and the strength of 3d and 7d is low, so its use is limited

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