Polypropylene fiber recycled brick and concrete coarse aggregate concrete and preparation technology thereof

Abstract

The invention provides polypropylene fiber recycled brick and concrete coarse aggregate concrete and a preparation method thereof. The polypropylene fiber recycled brick and concrete coarse aggregateconcrete is mainly prepared from the following raw materials: water, cement, fine aggregate, recycled brick coarse aggregate, recycled concrete coarse aggregate and polypropylene fibers, wherein the mass ratio of the water to the cement to the fine aggregate to the recycled brick coarse aggregate to the recycled concrete coarse aggregate to the polypropylene fibers is 1:2.54:4.49:3.07:3.40:0-1.8:0.01. The specific preparation method comprises the following steps of mixing all the raw materials, and then adding a water reducer. The prepared polypropylene fiber recycled brick and concrete coarseaggregate concrete has the advantages that the working performances such as the workability, the liquidity and the water-retaining property are good, in addition, the preparation process is simple and environmentally-friendly, and construction is easier.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a polypropylene fiber regenerated brick concrete coarse aggregate concrete and a preparation method thereof. Background technique [0002] With the continuous expansion of my country's cities, a large number of existing buildings are facing demolition, and the resulting construction waste is huge. It is estimated that my country's construction waste will reach 6.38×109t in 2020. The recycling of abandoned construction waste is not only the need of the times, but also has great significance for protecting the environment, saving resources, and developing ecological buildings. At present, waste concrete and waste sintered bricks often coexist in urban construction waste, and waste bricks account for about 30% to 50%. The recycled aggregate obtained after crushing is brick-concrete mixed aggregate. [0003] In engineering practice, except for a small amount of landfill ...

AI Technical Summary

Problems solved by technology

The current research mainly focuses on recycled concrete aggregates, and there are few reports on recycled bricks and recycled concrete.

(2) Although there are many studies on the replacement of natural aggregates with recycled concrete coarse aggregates, the separation technology of brick and concrete in my country is still in the development stage, and the single-mixing of recycled concrete aggregates limits the utilization efficiency of recycled aggregates.

(3) Research on the enhancement and modification of recycled aggregates is currently mostly focused on the reprocessing of recycled aggregates, such as mechanical activation and acid activation. The application is labor-intensive and time-consuming, and there is a certain amount of dust pollution and acid residues.

There are also ways to change the physical structure of concrete by adding fibers, such as adding steel fibers, etc., but the cost involved is relatively large, which is not conducive to the popularization and application of recycled concrete, which is also contrary to the cheap and easy availability of recycled aggregates.