Abstract
The flexural performance of six rebar-concrete beams from an industrial plant over 50 years in Northwest China is investigated. Firstly, the concrete cores are tested for carbonation depth and compressive strength. Moreover, the rebars extracted from crushing process are tested for yield, ultimate strength and ductility. Secondly, exceeding 50 years rebar-concrete beams are tested by three-point loading for flexural ultimate capacity, deflection and crack evolution process. The results show that sectional carbonization occurs in concrete, which is related to position, and the maximum reduction of mean compressive strength is 16.88%. Tensile yield, ultimate strength and plastic deformation capacity of rebar decrease. In addition, the new crack load and ultimate flexural capacity of specimen beams are reduced, and cracks and deflection develop rapidly. Finally, a comparison of experimental values and three previous models shows that calculated values of existing models are lower than experimental values, which is relatively conservative evaluation.
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