Article (Scientific journals)
Effect of misalignment on pulloff test results: numerical and experimental assessments
Courard, Luc; Bissonnette, Benoît; Garbacz, Andrzej et al.
2014In ACI Materials Journal, 111 (2), p. 153-162
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Keywords :
bond; misalignment; numerical simulations; pull-off test; repair; stress concentration; inclination; coring
Abstract :
[en] The successful application of a concrete repair system is often evaluated through pull-off testing. For such in-situ quality control (QC) testing, the inherent risk of misalignment might affect the recorded value and eventually make a difference in the acceptance of the work. So far, the issue of eccentricity in pull-off testing has been ignored in field practice, because it is seen as an academic issue. This paper presents the results of a project intended to quantify the effect of misalignment on pull-off tensile strength evaluation and provide a basis for improving QC specifications if necessary. The test program consisted first in an analytical evaluation of the problem through 2-D FEM simulations and, in a second phase, in laboratory experiments in which the test variables were the misalignment angle (0°, 2° and 4°) and the coring depth (15 mm [1.18 in.], 30 mm [2.36 in.]). It was found that calculations provide a conservative but realistic lower bound limit for evaluation the influence of misalignment upon pull-off test results: a 2° misalignment can be expect to yield a pull-off strength reduction of 7 to 9 % respectively for 15-mm [1.18-in.] and 30-mm [2.36-in.] coring depths, and the corresponding decrease resulting from a 4° misalignment reach between 13 and 16%; From a practical standpoint, the results generated in this study indicate that when specifying a pull-off strength limit in the field, the value should be increased (probable order of magnitude: 15%) to take into account the potential reduction due to testing misalignment.
Disciplines :
Civil engineering
Author, co-author :
Courard, Luc  ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Bissonnette, Benoît;  Université Laval > Département de Génie Civil
Garbacz, Andrzej;  Warsaw University of Technology
Vaysburd, Alex;  Vaycon Consulting, Baltimore (U.S.A.)
von Fay, Kurt;  U.S. Bureau of Reclamation, Denver (CO), U.S.A.
Moczulski, Grzegorj
Morency, Maxim
Language :
English
Title :
Effect of misalignment on pulloff test results: numerical and experimental assessments
Publication date :
2014
Journal title :
ACI Materials Journal
ISSN :
0889-325X
Publisher :
American Concrete Institute
Volume :
111
Issue :
2
Pages :
153-162
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
WBI - Wallonie-Bruxelles International [BE]
Funding text :
WBI Cooperation programs with Poland and Quebec - ACI Concrete Research Council
Available on ORBi :
since 22 March 2014

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