Abstract

Five variants of a test intended to characterize the mechanical resistance offered by either mortar or concrete to coarse-aggregate popouts were compared. Popout resistance increased with depth-of-cover to the source of internal pressure and was inversely proportional to the size of the expansion site. Composition of the paste, content of supplementary cementing materials, curing, and type of surface finish significantly influence popout resistance; for a given size and depth, popout resistance can vary by more than a factor of two due to these factors. In one comparison with two-year performance in the field, measurements of popout resistance at a depth of 7 mm correlated well with the incidence of aggregate popout failures, and correlated well with scaling in one laboratory study. Measurements of popout resistance at a depth of 11 mm did not correlate with scaling behavior.

Issue Section:
Research Papers
Keywords:
aggregate popouts, curing, scaling, supplementary cementing materials, surface strength

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