Recycled micropowder concrete and preparation method thereof

Abstract

The invention relates to a recycled micropowder concrete and a preparation method thereof. The recycled micropowder concrete comprises cement, sand, gravel, water, recycled micropowder and activator Ca(OH)2. The preparation method comprises the following steps: 1) crushing waste concrete into fine aggregate, and screening out the recycled micropowder with the diameter of less than 0.16mm; 2) according to the amounts of materials of the concrete with the water-to-cement ratio of 0.54 and the calculated strength grade of C30, replacing 10% of cement with equal mass of recycled micropowder, and adding the activator Ca(OH)2 which accounts for 3.5 wt% of the recycled micropowder; and 3) weighing the cement, recycled micropowder and activator Ca(OH)2, adding into a stirrer, stirring uniformly, adding water, stirring, sequentially adding the sand and gravel, and stirring. The recycled micropowder concrete prepared by the method has higher strength and carbonization resistance than normal concrete with the same mixing proportion, is safely applied to practical engineering, and enhances the utilization ratio of the waste concrete.

Description

technical field [0001] The invention relates to a building material, in particular to a recycled micropowder concrete and a preparation method thereof. Background technique [0002] In today's civil construction industry, concrete is still the main structural material, but due to the influence of environmental conditions and the defects of concrete itself, it often reduces the quality of the results, creates hazards, and reduces the life of the building. [0003] At present, my country's urban construction is accelerating day by day, the construction industry is developing rapidly, and a large amount of construction waste is produced in the process of demolition and new construction. With the increasing amount of waste concrete, how to effectively deal with and recycle it has become a very urgent problem. The traditional way to deal with waste concrete is to transport it to the outskirts for stacking or landfill, which not only takes up a lot of cultivated land, but al...

AI Technical Summary

Problems solved by technology

The traditional disposal method of waste concrete is mainly to transport it to the outskirts for stacking or landfill, which not only takes up a lot of cultivated land, but also causes environmental pollution

For this reason, some projects crush waste concrete into aggregates, which are used to replace natural aggregates to produce recycled concrete, so that waste concrete has been used to some extent, but the fine powder produced during the crushing process has not been utilized, reducing the utilization rate of waste concrete