High-compressive-strength recycled concrete and preparation process thereof

Abstract

The invention discloses high-compressive-strength recycled concrete and a preparation process thereof. The high-compressive-strength recycled concrete comprises the following components in parts by weight: 300-420 parts of reinforced recycled aggregate, 25-35 parts of recycled micro powder, 100-200 parts of natural coarse aggregate, 120-200 parts of natural fine sand, 120-170 parts of cement, 50-130 parts of fly ash, 50-120 parts of mineral powder, 6-12 parts of a waterproof agent, 0.8-2.2 parts of an air entraining agent, 120-160 parts of water and 20-35 parts of polypropylene mixed filler. The preparation process comprises the following steps: S1, weighing corresponding amounts of cement and natural fine sand, putting the cement and the natural fine sand into a stirrer, and stirring for40-60 seconds; S2, weighing the regenerated micro-powder, the fly ash, the mineral powder and the polypropylene mixed filler according to corresponding proportions, adding the weighed materials into the stirrer in the step S1, continuing to stir and mix for 30-40 seconds, adding half of the water according to the proportion, continuing to stir for 30-40 seconds, and mixing to obtain mortar with uniform color; and S3, adding the rest half of the water, the reinforced recycled aggregate, the natural coarse aggregate, the air entraining agent and the waterproof agent according to the proportion in the step S2, and continuously stirring for 60-80 seconds until the mixture is uniform.

Description

technical field [0001] The invention relates to the technical field of concrete production, more specifically, it relates to a high compressive strength recycled concrete and its preparation process. Background technique [0002] Concrete is widely used in modern construction projects because of its good durability, strong bearing capacity, and rich raw materials. In the process of modern construction, different formulas of concrete can be used according to different construction requirements, and then concrete pouring technology can be used to make different strengths. Follow the shape of building components. [0003] With the rapid development of the construction industry, a large amount of construction waste has been produced along with the production of a large number of concrete buildings. The backlog of these abandoned concrete buildings has caused enormous pressure on the land and the ecological environment. On the other hand, a large number of new construction, reco...

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Problems solved by technology

[0005] Although the existing technical solutions can use building waste to produce recycled aggregates, which improves the resource utilization rate, the recycled aggregate particles formed after the waste concrete is crushed have many edges and corners, and the surface is rough. The damage accumulates inside and causes a large number of microcracks, resulting in the recycled aggregate itself having large porosity, high water absorption, low packing density, and high crushing index, which will affect the strength and durability of the concrete after hardening

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