A Grading and Evaluation System for Low-Quality Recycled Aggregate

Abstract

The invention discloses a grading evaluation system of low-quality recycled aggregates. The grading evaluation system comprises the following steps: (1) carrying out grading evaluation on low-quality recycled aggregates; (2) carrying out grading evaluation on ordinary aggregates; (3) carrying out grading evaluation on mixed aggregates, wherein mixed coarse aggregates are composed of low-quality coarse recycled aggregates and ordinary coarse aggregates; the performance indexes of the mixed coarse aggregates meet the requirements as follows: the crushing value index is less than 30%, the sturdiness is less than 12%, and the water absorption of an hour is less than 3%; mixed fine aggregates are composed of low-quality fine recycled aggregates and ordinary fine aggregates; and the performance indexes of the mixed fine aggregates meet the requirements as follows: the compressive strength rate of 28 days is greater than or equal to 85%, the sturdiness is less than 10%, and the saturated-surface-dried moisture retention is less than 5%. When the low-quality brick recycled aggregates of meeting the grading evaluation indexes disclosed by the invention are applied to recycled aggregate concrete, the recycled aggregate concrete has the advantages of high compressive strength, stable performance and the like, and the problem of recycling of the low-quality recycled aggregates can be effectively solved.

Description

technical field [0001] The invention relates to a grading and evaluation system for low-quality recycled aggregates, which belongs to the fields of construction waste recycling and building material waste utilization. Background technique [0002] According to statistics, the amount of construction waste in my country has accounted for 30-40% of the total amount of urban waste. After rough statistics on the loss of construction materials for buildings such as brick-concrete structures, all-cast-in-place structures and frame structures, the construction waste per 10,000 square meters During the construction process, only 500-600t of construction waste will be produced. And with the rapid development of the construction industry, the output of cement and concrete is increasing day by day, which has caused unsustainable problems in the high-quality sand and gravel resources in many areas. At the same time, the massive mining and use of natural materials has also caused soil eros...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that there is no grading and evaluation system for low-quality recycled coarse aggregate and low-quality recycled fine aggregate in the prior art, and then provide a grading and evaluation system for low-quality recycled aggregate

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