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As a kind of environmental friendly material, the recycled aggregate concrete (RAC) attracts extensive attention. The compressive behavior of it is main problem in study. Currently, one problem in study is how to create the macroscopic numerical analysis model of recycled aggregate (RA). In this paper RAC is considered as six-phase composite material, which include natural aggregate (NA), old mortar, new mortar, interface of NA and old mortar, interface of NA and new mortar and interface of old mortar and new mortar. In the problem of aggregate distribution, this paper use geometry information came from the failure surface of RAC specimen. Through numerical simulation to cube specimen section, this paper gets the uniaxial compression stress-strain curves and the process of cube concrete specimen section cracking. The analysis of results obtained following conclusions: considering RA as three-phase composite material (NA, old mortar, interface of NA and old mortar) could reflect the macro-cracking process in RA; The additional interface came from RA lead to RAC having more micro-crack than common concrete; The RA has coarse surface which let it combine with new mortar more firmly; The same elastic modulus of old mortar and new mortar let them having a similar displacement under a same stress, which inhibit cracking in interface of old mortar and new mortar.

MACROSCOPIC NUMERICAL SIMULATION ON COMPRESSIVE BEHAVIOR OF RECYCLED AGGREGATE CONCRETE BASED ON IMAGE ANALYSIS