Abstract:

In order to reduce the production cost of recycled aggregate and improve the utilization rate of waste con-crete in common engineering application of recycled concrete,a new type of recycled concrete material named wasteconcrete- participated recycled concrete was prepared by straightly blending wet and broken waste concrete blockwith fresh concrete. The maximum size of waste concrete block for blending is up to 50 ～80mm,which may expandthe superiority of waste concrete in reducing the production cost and improving its utilization rate.Then,mechani-cal behavior studies were conducted for the 150 or 300mm module specimens and the slabs of waste concrete- partici-pated recycled concrete. The results show that,even when the participation rate of waste concrete reaches 30% ～40%,the compressive strength,tensile strength and elastic modulus of the prepared recycled concrete are veryclose to those of common concrete in the same strength grade,which means that the recycled concrete possessesideal mechanical properties. Moreover,it is also found that both the punching bearing capacity and the failure cha-racteristics of the recycled concrete slabs are very close to those of common concrete slabs.

Key words: waste concrete, waste concrete- participated recycled concrete, compressive strength, tensile strength, elastic modulus, punching bearing capacity