Regenerated mixed fine aggregate grading and mixing ratio determination method

Abstract

The invention belongs to the technical field of building material testing, and relates to a regenerated mixed fine aggregate grading and mixing ratio determination method. The method comprises the following steps: firstly, preparing an aggregate A, an aggregate B and a mixed aggregate within a certain particle size range; then the aggregate A, the aggregate B and the mixed aggregate are subjected to classified screening, and screened and classified materials of all the levels of pore diameter ranges of each kind of aggregate are obtained; determining each grade of screen residue, apparent dry density and water content of each screened and graded material; the mass ratio of the ith grade of the aggregate A is calculated, then the ith-grade screen residue and the volume percentage Pi in the mixed aggregate are calculated, and the grading and mixing ratio is obtained; the invention relates to a method for determining the mixing proportion of each fraction of regenerated mixed fine aggregate and the fine aggregate grading based on the difference between the moisture content and the water absorption rate of each component of the regenerated mixed aggregate. The problem that the grading curve of the crushed regenerated mixed fine aggregate cannot be determined in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of building material testing, and relates to a method for determining the gradation and mixing ratio of recycled mixed fine aggregates. Background technique [0002] The recycled mixed aggregates prepared from the demolition construction waste generated by the renovation of the old city are mainly recycled concrete and recycled bricks. According to relevant statistics, waste concrete accounts for about 41% and waste bricks account for more than 40%. Waste bricks include clay bricks, slag bricks and coal gangue bricks. However, the above-mentioned waste bricks all have the characteristics of low strength, high porosity and high water absorption, and how to recycle them has become a hot topic of exploration. Among the many utilization directions of waste bricks, the use of waste bricks to prepare recycled fine aggregates for recycled brick aggregate concrete, pavement base, thermal insulation mortar, pipe tre...

AI Technical Summary

Problems solved by technology

In order to configure reasonable recycled mixed aggregates, the patented method (zl201910093050.1) proposes a method of confinement crushing, but this method cannot determine the volume ratio and gradation curve of recycled mixed fine aggregates (particle size not greater than 4.75mm) after crushing

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