Abstract: The confined shrinkage test of crumb rubber concrete with high content and ordinary concrete without rubber which are semidry hard were done with outside-square inside-circle eccentric constraint method.And the circumferential strain of 0° zone, 90° zone and 180° zone on the inner surface of steel ring within 120 h was collected by static resistance strain gauge.The research results indicate that every splitting section on 6 sets of outside-square inside-circle specimens come into being at its narrowest part(0°zone).The early shrinkage and contraction percentage of semidry hard crumb rubber concrete was less than that of rubber-free semidry hard ordinary concrete.The cracking time of semidry hard crumb rubber concrete specimen was later than that of semi-dry hard ordinary concrete.The crack width of the former is smaller than the latter.And the measured strain values verify a certain rule for the first time: 0° zone>90° zone>180° zone.The relative values of strain at 0° zone/90° zone and 0° zone/180° zone were calculated and it was found that these two values stabilized with time.This indicates that it is reasonable to use the static linear elastic finite element method to simulate the outside-square inside-circle eccentric confined shrinkage test.

Key words: crumb rubber concrete;semidry hard concrete;shrinkage test;outside-square inside-circle eccentric constraint;strain;finite element simulation