Reference : Comparison of Destructive Methods to Appraise the Mechanical Integrity of a Concrete ...
Scientific journals : Article
Engineering, computing & technology : Civil engineering
Comparison of Destructive Methods to Appraise the Mechanical Integrity of a Concrete Surface
Courard, Luc mailto [Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Matériaux de construction non métalliques du génie civil >]
Bissonnette, Benoît mailto [Université Laval > > > >]
Vaysburd, Alex [VayCon Consulting, Baltimore > > > >]
Bélair, Normand [Université Laval > > > >]
Lebeau, François [Université de Liège - ULiège > > > >]
Concrete Repair Bulletin
International Concrete Repair Institute
[en] concrete ; repair ; integrity ; Schmidt rebound hammer ; pull-out test ; pull-off test ; surface preparation
[en] Depending on the technique being used, the concrete removal operation prior to repair can be harmful to the residual concrete skin left on the structure. Whenever a tight bond between the repair and the old concrete is required, the soundness of the prepared surface should thus be assessed. Although this is widely recognized, there is no standard method intended to characterize the integrity of a concrete substrate after concrete removal. This paper presents the results of an investigation intended to assess and compare quantitatively different test methods, namely the Schmidt rebound hammer, the pull-out test and the pull-off test, to evaluate superficial mechanical integrity of a substrate after concrete removal operations. Although it does not yield a precise evaluation of compressive strength, the Schmidt rebound hammer test is recognized as a useful tool for performing quick surveys to assess concrete uniformity. The pull-off test is very well correlated with the splitting-tensile test, but it is not suited for vertical and overhead surfaces. The Capo pull-out test has limited interest for surface preparation, as it is applicable to flat surfaces only. Conversely, the accelerated pull-out test showed interesting potential as a simple and relatively rapid means for assessing the mechanical integrity of a concrete surface prior to repair for any type of concrete surface. More work is definitely required to refine the procedures and develop performance criteria. Nevertheless, it appears from the results generated in this study that the combination Schmidt hammer / pull-off test could fill the needs for the evaluation of horizontal surfaces after concrete removal, while the combination Schmidt hammer / accelerated pull-out test could be used effectively on vertical and overhead surfaces.
Coopération scientifique WBI/Québec
Researchers ; Professionals ; Students

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