Method for preparing large-mixing-amount low-quality mineral admixture recycled cement-based product through microwave curing

Abstract

The invention discloses a method for preparing a large-mixing-amount low-quality mineral admixture recycled cement-based product through microwave curing. The preparation method of the recycled cement-based product comprises the following steps: mixing a recycled aggregate with alkali liquor in a vacuum environment, ultrasonically dispersing and mixing a mixture of the alkali-treated recycled aggregate, a low-quality mineral admixture, a dispersing agent and the water, putting the mixture into the vacuum environment again, adding cement and a fine aggregate, stirring and molding, and curing and accelerating coagulation of a molded cement-based product under the action of microwaves. According to the method, the hydration hardening rate of cement-mineral admixture slurry can be increased through the microwave effect, and early performance increase of the cement-based product is promoted; besides, under the action of the microwaves, the modification effect of the alkali liquor on the recycled aggregate and the alkali-activated activity of the low-quality mineral admixture are subjected to accelerated reaction in pores of the recycled aggregate, filling is compact, the defects that the recycled aggregate is large in porosity, large in water absorption rate and the like can be effectively overcome, and the long-term mechanical property and durability of a cement-based product are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing a large-volume low-quality mineral admixture recycled cement-based product through microwave curing. Background technique [0002] With the development of my country's economy, a large amount of industrial solid waste and construction waste are produced in the process of industrial production and urbanization acceleration. Compared with developed countries, the level of comprehensive utilization of construction waste resources in my country is relatively low, and the recycling of solid waste is still in the exploratory stage. Low-quality fly ash and slag are the vast majority of industrial solid waste. Most of the construction waste represented by waste concrete is mainly disposed of in open-air stacking and landfill. If the above-mentioned solid waste cannot be rationally utilized, It will become the soft underbelly and flaw that af...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned technical solutions are only aimed at the utilization of low-quality mineral admixtures or the treatment of recycled aggregates, respectively

For the preparation of cement-based materials using these two types of solid waste in large quantities, and at the same time improving the reactivity of low-quality mineral admixtures and reducing the defects of recycled aggregates, there is no reference in the existing data.

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