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Recycled aggregate concrete which is used as a green building material has attracted more and more researchers withthe shortage of resources and an increasing number of construction wastes.They have carried out series of experimentsand some conclusions have been obtained.An overview of study on recycled aggregate concrete has been given by Xiaoet al(2012).However,because of the complexity of recycled coarse aggregates,conclusions made by differentresearchers are usually not very accordant,even opposite sometimes.