2Bairagi N K, Kishore R. Behavior of concrete with different proportions of natural and recycled aggregates, Resource[J]. Conservation and Recycling, 1993, 9(3) :109.
3Topcu I B, Guncan N F. Using waste concrete as aggregate[J].Cement and Concrete Research, 1995, 25(7):1385.
4Ruhl M, Atkinson G. The influence of recycled aggregate concrete on the stress-strain relation of concrete[R]. Darmstadt: [ s. n. ], 1999.