Experimental Study on Bond-Slip Mechanical Properties of Concrete with Different Admixtures and Corroded Reinforcement

Abstract

Abstract: The center-drawing method was used to conduct bond-slip tests on plain concrete (PC), cementitious capillary crystalline water-proofing concrete (CCCW), and polypropylene fiber reinforced concrete (PFRC) with hot-rolled ribbed steel reinforcement. To investigate the bonding capability of the reinforcement with concrete after rusting, the electrochemical corrosion method was used to accelerate the rusting of the reinforcement. The results show that introducing an appropriate amount of polypropylene fiber and capillary crystallinewater-proofing material into the concrete increase the ultimate bond strength of reinforced steel by 20.8% and 6.8%, respectively. The ultimate bond strength of reinforcement-concrete pull-out specimens with and without admixture shows a linear decreasing trend with the increase of corrosion rate. The formula of ultimate bond strength of concrete with different internal admixtures and corrosion rate is fitted based on the results of the pull-out test, and it is discovered that polypropylene fiber and capillary crystalline water-proofing material could slow down the decrease of ultimate bond strength of reinforced-concrete with the increase of corrosion rate.

Key words: polypropylene fiber reinforced concrete, cementitious capillary crystalline water-proofing concrete, central pull-out, bond behavior, electrochemical corrosion, corrosion of reinforcement, reinforcement concrete

CLC Number:

TU528.57

ZHUANG Binbin, XIAO Chaoxiong, LIU Qiang, DENG Jiahui, WANG Dayang. Experimental Study on Bond-Slip Mechanical Properties of Concrete with Different Admixtures and Corroded Reinforcement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2767-2773.

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