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The effects of common surface pretreatments on the shear strength of bonded concrete overlays

by Andrew Stephen Pultorak

Institution:	University of Colorado at Denver
Year:	2017
Keywords:	Civil engineering
Posted:	02/01/2018
Record ID:	2165163
Full text PDF:	http://pqdtopen.proquest.com/#viewpdf?dispub=10244643

Abstract

The durability of a concrete repair is highly dependent on the shear strength of the interface between new and old concrete. Therefore, the engineer designing the repair makes every effort to maximize this strength. To that end, pretreatments, such as prewetting the substrate and/or applying bonding agents, are commonly specified. The efficacy of these pretreatments is often debated, and previous studies have produced contradictory results. This research was undertaken to determine the effects of prewetting the substrate and applying a bonding agent, both in combination and individually. The bond strength in tension and the shear strength of the bond were measured using a variety of methods, including in-place testing and testing of extracted specimens. The results indicate that both prewetting and the use of a bonding agent can be beneficial to the shear strength of bonded overlays.