Effect of Voids In Grouted Post-Tensioned Concrete Bridge Construction - Vol-2


1. INTRODUCTION

Volume-1 of this research report presented characteristics of post-tensioned bridges and described the environmental conditions of Texas. It also presented electrochemical and tension capacity (C





) behavior of PT systems and the time-variant structural reliability of a typical PT bridge. Volume-2 presents the recommended procedures to inspect PT tendons for voids, to characterize PT grouts, and to repair voids in PT tendons. It should be noted that during the final year of this research project, a repaired tendon in a PT bridge in Virginia failed due to corrosion. This failure occurred approximately three years after being repaired. It is believed that this failure may have been caused by the galvanic cells that developed at the interface between existing and repair grouts. This corrosion mechanism was not investigated in this research. Repairs on PT bridges were not performed as a result of this concern. Research is needed to evaluate the potential impact of repair grouts on corrosion of PT strands. This volume also presents analytical models to assess economic risk associated with the mitigation strategies of PT bridges.


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