Abstract

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Title:: Meso-scale Numerical Simulation on Crack Process of Concrete Cover Induced by Adjacent Rebar Nonuniform Corrosion

Author(s):: ZHANG Ren-bo; DU Xiu-li; JIN Liu; Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education

Keywords:: concrete cover; mesoscale numerical simulation; rebar nonuniform corrosion; corrosion mechanism; failure mode

Abstract:: In order to investigate the crack process of concrete cover induced by two adjacent rebar nonuniform corrosion, a mesoscale numerical model was established. Considering the influence of concrete mesostructure, the concrete was assumed to be a threephase composite material composed of aggregate, mortar matrix and interfacial transition zone (ITZ), and the mechanical effect of rebar nonuniform corrosion was simulated by the forced displacement. A parametric study was conducted based on the model. The results show that the mesoscale simulation results are coincided with the test results from the literature; there are two failure patterns including internal cracking penetration taken place more easily or difficult than external cracking; rebar diameter is not a main parameter influencing the failure of concrete cover; concrete cover thickness effects the development of external cracking principally; and rebar distance controls internal cracking penetration predominantly.