Preparation process for reclaimed concrete aggregates and reclaimed concrete employing reclaimed concrete aggregates

Abstract

The invention relates to a preparation process for reclaimed concrete aggregates and reclaimed concrete employing the reclaimed concrete aggregates. The process comprises the following processing steps: S1: pretreatment; S2: reinforcement treatment; S3: screening treatment; S4: grading treatment: adding reclaimed concrete aggregates with the grain size smaller than 5 mm into a gravel grinder, carrying out polishing until the grain size is 0.2 mm to 0.6 mm, and carrying out grading treatment by wind power to remove micropowder with the grain size smaller than 0.2 mm and obtain reclaimed concrete fine aggregate grains with the grain size is 0.2 mm to 0.6 mm; subjecting reclaimed concrete aggregate grains with the grain size of 5 mm to 20 mm to crushing treatment until the grain size is 5 mm to 7 mm, so as to obtain reclaimed concrete coarse aggregate grains with the grain size of 5 mm to 7 mm; and subjecting reclaimed concrete coarse aggregates with the grain size of 20 mm to 50 mm to hammering treatment, and repeating the step S3; and S5: baking and collecting. Through carrying out reinforcement treatment on the reclaimed concrete aggregates, the porosity and water absorption rate of the reclaimed concrete aggregates are lowered, and the mechanical strength of the reclaimed concrete aggregates is improved, so that the mechanical strength and durability of the reclaimed concrete are improved, and the applicable range of the reclaimed concrete is increased.

Description

technical field [0001] The invention relates to the technical field of concrete buildings, in particular to a preparation process of recycled concrete aggregate and recycled concrete using the same. Background technique [0002] With the development of society, there are more and more buildings and construction projects. Concrete components are widely used in columns and foundation piles of tower structures, industrial plants and civil buildings. With the transformation of the city, a large number of abandoned buildings in the city have formed construction waste. The disposal of these construction waste not only requires a large area of ​​storage yard, but also costs a lot of manpower and material resources. With the development of construction science, effective utilization of construction waste has become a new topic. [0003] The construction waste formed from the concrete of abandoned buildings is recycled into recycled concrete after shredding, which not only handles a...

AI Technical Summary

Problems solved by technology

These characteristics of recycled aggregates lead to low strength and poor durability of recycled concrete, so currently recycled concrete is mostly used in non-structural and non-load-bearing concrete fields such as backfill and roadbed

Restricted by the application field, the utilization rate of recycled concrete is very low

The low mechanical properties of recycled concrete has become a bottleneck restricting the application of recycled concrete

Images