A kind of high-performance recycled concrete and its preparation process

Abstract

The invention discloses a high-performance recycled concrete and a preparation process thereof, and relates to the technical field of concrete preparation, which comprises the following raw materials in parts by weight: 220-240 parts of cement; 140-160 parts of fly ash; 60-80 parts of mineral powder 600-800 parts of modified recycled coarse aggregate; 500-700 parts of natural gravel; 600-700 parts of machine-made sand; 20-40 parts of reinforcing agent; 40-60 parts of silicon powder; 180‑200 copies. By adjusting the ratio of various raw materials of concrete, adding reinforcing agent and modifying recycled aggregate, the working performance of concrete can be effectively improved, and the compactness and overall strength of concrete can be improved.

Description

technical field [0001] The invention relates to the technical field of concrete preparation, in particular to a high-performance recycled concrete and a preparation process thereof. 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 large amount of ...

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Problems solved by technology

[0004] However, the recycled concrete aggregate obtained after crushing waste concrete and discarded bricks has too many edges and corners, and most of the recycled aggregate is needle-shaped

Moreover, during the crushing process of recycled aggregates, tiny cracks will be generated inside the aggregates, and at the same time, a part of the old mortar is generally adhered to the surface of recycled aggregates, so that compared with natural aggregates, recycled aggregates have a large crushing index and high water absorption. , large porosity, low apparent density, etc., resulting in the low strength and poor durability of recycled concrete made from recycled aggregate, resulting in very low utilization rate of recycled concrete, which is generally used for backfill, roadbed, etc. The field of non-structural non-load-bearing concrete affects the scope of use of recycled concrete

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