At first

the influence of recycled coarse and fine aggregate on dry shrinkage features of concrete was studied. It is indicated that the recycled aggregate makes significant impact on dry shrinkage features of concrete

particularly the fine aggregate. Through the optimization of the mix of recycled highstrength concrete

the dry shrinkage rate of coarse aggregate concrete was only slightly larger than that of the natural one. Bulking agent used in recycled concrete could compensate the shrinkage effectively to achieve the objective of microshrinkage. At the same time

it is shown that the impact of conservation in dry environment on recycled concrete strength is greater than that of ordinary one. Thus

more attention should be paid to the moisture in the conservation of recycled concrete. In addition

the shrinkage mechanism of recycled concrete was analyzed from the perspectives of interface structure and aggregate features.〖JP〗