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Indexed by:会议论文

Date of Publication:2015-09-21

Included Journals:EI、CPCI-S、SCIE、Scopus

Page Number:714-723

Key Words:Ring test; Restraint shrinkage; Elliptical ring; Initial fracture toughness

Abstract:The restrained ring test has been used to assess the potential for early-age cracking of concrete and other cement-based materials. Recently, a novel elliptical ring test method is proposed to replace the circular ring test method for the purpose of shortening test duration and more conveniently examining crack evolution in restrained concrete rings. In order to explore the mechanism of this test method, a numerical model is developed to analyze crack propagation process in restrained concrete rings, in which the effect of concrete shrinkage is simulated by a fictitious temperature drop applied on concrete causing the same strain as that induced by shrinkage. Finite element analysis is carried out to simulate the evolution of SIF in restrained concrete rings subject to circumferential drying. It is found that the failure mechanism of concrete rings changed with the increase of concrete ring wall thickness. Elliptical rings with appropriate geometry can enable crack initiation much earlier than circular rings in the case that crack is caused by the restraint of the central steel ring.