Bonding Properties of Steel Fiber Modified Crumb Rubber Concrete and Deformed Bar

Abstract

Abstract: Four groups of steel fiber(steel fiber volume fraction is 0%, 0.5%, 1.0%, 1.5%, respectively) modified crumb rubber concrete(SFCRC) bond specimens were designed and made in this experiment. The influence of steel fiber volume fraction on bond failure mode, initial bond strength, ultimate bond strength and bond-slip curve was systematically studied by central pull-out test. The results show that with the increase of the steel fiber volume fraction, the initial bond strength is increased by 5.37%, 8.35%, 0.89%, and the ultimate bond strength is increased by 9.44%, 16.49%, 12.91%, respectively, compared with crumb rubber concrete. Adding appropriate amount of steel fiber significantly improves the failure form of bond specimens. The rising section, the descending section and the residual section together constitute the bond slip curve of steel fiber modified crumb rubber concrete. The fullness extent and rising section’s slope of the bond-slip curve increase with the increase of steel fiber volume fraction. Based on the experimental results, the bond-slip constitutive equation of steel fiber modified crumb rubber concrete and deformed steel bar is established, which provides a certain reference for its structural design.

Key words: steel fiber modified crumb rubber concrete, deformed bar, steel fiber, bond strength, bond-slip constitutive equation

CLC Number:

TU528

WANG Yihong, CHEN Chao, HUANG Menglong. Bonding Properties of Steel Fiber Modified Crumb Rubber Concrete and Deformed Bar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3396-3404.

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