Recycled concrete technology is a technology that the waste concrete blocks are broken, cleaned and graded, and then mixed in a certain proportion to form recycled aggregate, and partially or completely replace the natural aggregate to prepare new concrete.Recycled aggregate can be divided into road recycled aggregate and building recycled aggregate according to its source, and into recycled coarse aggregate and recycled fine aggregate according to its particle size.

The characteristics of recycled aggregate concrete are: 

(1) the thermal conductivity of recycled concrete is small, good thermal performance, if used in the building envelope, can significantly enhance the thermal insulation effect of the building.

(2) the density of recycled concrete is small, low weight, used to produce block, hollow brick, wallboard, replace the traditional solid clay brick, become a good filling wall material, with obvious economic and environmental benefits.In view of the characteristics of recycled aggregate concrete, it is considered that it is suitable to be popularized and applied in the filled wall of frame structure.

After the disused concrete block is broken, it can be used as concrete aggregate to save the purchase cost of gravel and pebbles.It can be built into gravity retaining wall in highway engineering.Fly ash can be added after processing, the production of concrete without ordinary cement, as a filler and roadbed.

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