Abstract
There is not yet a consensus on the quality parameters for the steel-concrete bond for shotcrete reinforced elements or whether or not shotcrete is comparable in performance to regular cast-in-place concrete. This paper presents the results of a series of lab experiments on the bond strength of lap-spliced beams cast using the wet shotcrete process: the American Concrete Institute bond strength equations were used to evaluate the performance of shotcrete beams. The beams were compared to cast-in-place concrete beams of the same dimensions, steel configurations, and approximately the same concrete compressive strength. The bond strength of beams repaired using the wet process was also examined. The study includes the analysis of the performance of a new type of shotcrete admixture which enhances the steel-concrete bond. The results reveal that the bond strength is slightly lower for bottoms cast shotcrete, but that the top bar bond strength is increased considerably for the shotcrete beams, when compared to regular cast-in-place concrete, due to the reduced segregation and bleeding generated during the shotcrete process. When water soluble polymers are added to shotcrete, the performance of shotcrete as compared to control shotcrete is superior due to improved rheological behavior of concretes containing pumping aid and sag resistance additives (PASRA).
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