Recycled concrete aggregate reinforced by using construction waste micro powder and preparation method of recycled concrete aggregate

Abstract

The invention discloses a recycled concrete aggregate reinforced by using construction waste micro-powder, the recycled concrete aggregate is composed of a matrix, a modified wrapping layer and a surface reinforced layer, the matrix is a recycled aggregate, the modified wrapping layer is reinforced slurry, and the surface reinforced layer is carbide; wherein the recycled aggregate accounts for 80%-95% by mass, the reinforced slurry accounts for 4%-15% by mass, and the carbide accounts for 1%-5% by mass. The invention also provides a preparation method of the recycled concrete aggregate. According to the method, the raw materials are easy to obtain, the waste concrete aggregate and the micro powder thereof are utilized to the maximum extent, waste utilization and environmental protection are achieved, the cost is low, the technological process is simple, engineering practice application is facilitated, and the prepared modified recycled concrete aggregate is excellent in physical and mechanical property and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a recycled concrete aggregate strengthened by construction waste micropowder and a preparation method thereof. Background technique [0002] With the acceleration of my country's urbanization process, the annual production of construction waste in the country can reach 2 billion tons, with an average annual growth rate of 10%. The amount of construction waste in my country has accounted for 30-40% of the total urban waste. The site selection of construction waste dumps is largely random and difficult to degrade, and the dust generated during the removal and stacking of construction waste has caused environmental pollution. At present, the comprehensive utilization rate of construction waste resources in my country is less than 10%, mainly concentrated in recycled concrete aggregates, and construction waste micropowder is a problem that cannot be ignored in ...

AI Technical Summary

Problems solved by technology

The site selection of construction waste dumps is largely random and difficult to degrade, and the dust generated during the removal and stacking of construction waste has caused environmental pollution.

At present, the comprehensive utilization rate of construction waste resources in my country is less than 10%, mainly concentrated in recycled concrete aggregates, and construction waste micropowder is a problem that cannot be ignored in the recycling of waste concrete, accounting for about 5%-20% of the total waste concrete. Its main mineral components are silica, calcium hydroxide, ettringite and calcium aluminosilicate, etc. These components have potential activation properties, and at the same time, a large amount of carbon dioxide waste gas is produced in the cement industry production

These factors lead to the unsatisfactory application effect of recycled aggregate in concrete, which limits the utilization rate of its building material resources.