Method for preparing concrete by using reinforced recycled aggregate and application thereof

Abstract

The invention provides a method for preparing concrete from recycled aggregate. The method comprises the following steps: S1, preparing the recycled aggregate, and sorting to obtain coarse aggregate and fine aggregate; s2, preparation of recycled coarse aggregate: preparing a modified solution, and stirring and spraying the coarse aggregate to obtain the recycled coarse aggregate; s3, preparation of recycled fine aggregate: removing mortar attached to the surface of the fine aggregate in a water washing manner to obtain the recycled fine aggregate; s4, determining the use amount of the recycled coarse aggregate, and ensuring that the crushing index meets the corresponding design requirement; s5, determining the use amount of the recycled fine aggregate, and ensuring that the compressive strength ratio of the mortar in 28d meets the corresponding design requirement; s6, designing and preparing concrete ingredients, and ensuring that the strength and slump of the prepared recycled aggregate concrete can meet design requirements according to the design strength of the recycled aggregate concrete needing to be prepared, and the method has the characteristic that the use amount of natural aggregate is reduced on the premise that the aggregate is modified and performance indexes are not reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of recycled aggregates for road and bridge construction, in particular to a preparation method and application of reinforced recycled aggregates. Background technique [0002] With the acceleration of my country's urbanization process, the output of construction waste generated by the demolition and renovation of old buildings is also increasing rapidly. Garbage will also reach a staggering billions of tons. The output of construction waste is huge, which not only occupies a large amount of land, but also pollutes the environment and affects environmental sanitation. Reasonable disposal and utilization of construction waste not only helps to avoid occupying valuable land around cities and secondary environmental pollution, but also reduces the depletion of non-renewable natural resources, water and soil pollution caused by the mining of sand and gravel aggregates by replacing natural sand and ...

AI Technical Summary

Problems solved by technology

[0003] Recycled concrete aggregate is obtained by crushing, screening, cleaning, grading and mixing waste primary concrete. Compared with natural aggregate, the recycled aggregate is surrounded by attached mortar from the original concrete slurry. Moreover, the composition of the attached mortar is relatively complex, including natural sand in the cement stone, cement stone chips, stone chips and mud generated during the crushing process of natural coarse aggregate, and various impurities. The porosity and high water absorption of the attached mortar The rate reduces the mechanical properties and durability of recycled aggregate concrete, mainly because there are micro-cracks in the recycled aggregate during the crushing process, and the particles contain mortar and cement slurry. Compared with natural aggregate, it has high porosity and high water absorption. , low strength level and other shortcomings, coupled with the rough surface of the recycled aggregate, multi-edge, increased friction between the mixture and the concrete made of recycled aggregate is poor workability