Reinforced and regenerated coarse concrete aggregate, preparation method and application

Abstract

The invention discloses a reinforced and regenerated coarse aggregate, a preparation method and application of the reinforced and regenerated coarse concrete aggregate in concrete preparation. The reinforced and regenerated coarse aggregate is prepared by mixing an aggregate which is obtained by crushing waste concrete and screening the broken waste concrete and has the particle size of 5 mm to 15 mm with an aggregate which is obtained by crushing the waste concrete and screening the broken waste concrete and has the particle size of 15 mm to 31 mm according to the mass ratio of 4:3 and then reinforcing the mixture. The preparation method comprises the steps that 10, the waste concrete is crushed and screened to obtain the two regenerated aggregates with the different particle sizes; 20, 3 parts of the regenerated aggregate with the particle size of 15 mm to 31 mm is taken, stirred for 30 seconds to 50 seconds in the positive direction through a forced stirrer and then stirred for 30 seconds to 50 seconds in the negative direction through the forced stirrer; 30, 4 parts of the regenerated aggregate with the particle size of 5 mm to 15 mm is taken, added into the forced stirrer, stirred for 40 seconds to 60 seconds in the positive direction and then stirred for 40 seconds to 60 seconds in the negative direction, discharging is conducted, and then the reinforced and regenerated coarse aggregate is obtained. Accordingly, the regenerated coarse aggregate with the low crushing value and mortar adhesion rate is obtained through the simple operation technology and the low production cost.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, in particular to a reinforced recycled coarse aggregate, a preparation method and its application in preparing concrete. Background technique [0002] With the rapid development of my country's construction industry and road industry, more and more waste concrete is produced. In the past, the main measure for construction waste was to transport it to the suburbs for stacking and disposal. It will cause serious pollution to the local water environment and soil environment, and at the same time cause a lot of extra economic expenditure. [0003] At the same time, concrete production needs to consume a large amount of natural sand and gravel aggregates, resulting in resource depletion and ecological problems. For this reason, people began to consider using a large amount of waste concrete produced in the demolition and crushing of original buildings or concrete roads as recycled aggrega...

AI Technical Summary

Problems solved by technology

[0004] However, since recycled aggregates are aggregates of different particle sizes obtained by crushing waste concrete, their mechanical properties and various technical indicators vary greatly due to different processing techniques.

Research results at home and abroad show that there are many factors that affect the performance of recycled aggregates, including crushing value, water absorption rate, mortar adhesion rate, etc., and there is a correlation between the various indicators. The strengthening method for recycled aggregates , basically use external conditions to strengthen the aggregate, the operability is difficult, and the production cost is high

[0005] Therefore, the problems existing in the prior art are: high crushing value of concrete recycled aggregate, high mortar adhesion rate, complicated strengthening operation, and high production cost