Debonding of Thin Cement-Based Overlays
Publication: Journal of Materials in Civil Engineering
Volume 13, Issue 2
Abstract
Thin bonded cement-based overlays include surface repairs, toppings, and linings, especially on slabs, slabs on soil, concrete pavements, and tunnel walls. The aim of this paper is to show that, contrary to a widely held belief, debonding of cement-based overlays is governed not by the shear stress along the overlay-base interface but by the built-in tensile stress perpendicular to this interface. After a brief comparison with laminated composite materials and with beams reinforced by bonded strips (made of metal or of composite), the specific case of thin cement-based overlays is presented. Different conditions of debonding of an overlay are investigated. In all cases, the tensile stress perpendicular to the base-overlay interface is confirmed as the designing parameter. In terms of fracture mechanics, debonding of cement-based overlays is governed by a mixed mode in which mode I is widely dominant. There is a lack of appropriate tests to accurately characterize the mechanical behavior of the interface. Nevertheless, finite-element calculation relying on the mean values of the shear and tensile strength of the interfacial bond (calculation was performed with CESAR code) provides a good approximation of debonding initiation and propagation.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Austin, S., Robins, P., and Hanna, S. ( 1997). “Tensile bond testing of concrete repairs.” Mat. and Struct., RILEM, Cachan, France, 28(179), 249–259.
2.
Asad, M., Baluch, M. H., and Al-Gadhib, A. H. ( 1997). “Drying shrinkage stresses in concrete patch repair systems.” Mag. of Concrete Res., London, 49, 283–293.
3.
Bigwood, D. A., and Grocombe, A. D. ( 1989). “Elastic analysis and engineering design formulae for bonded joints.” Int. J. Adhesion and Adhesive, 9, 229–242.
4.
Chausson, H. ( 1997). “La durabilité des rechargements minces adhérents en béton renforcé de fibres métalliques.” Doctoral thesis, Université Paul Sabatier, Toulouse, France (in French).
5.
Chausson, H., and J.-L. Granju ( 1997). “Optimized design of fiber reinforced thin bonded overlays.” Proc., Brittle Mat. Compos., 5, A. M. Brandt, V. C. Li, and I. H. Marshall, eds., Woodhead Publishing, Cambridge, U.K., and Zturek Research Institute, Warsaw, 133–142.
6.
Do, M. ( 1989). “Developpement d'un essai de délamination par fatigue.” Mémoire de maîtrise es Sciences Appliquées, Spécialité Génie Civil, Université de Sherbrooke, Quebec (in French).
7.
Farhat, H. ( 1999). “Durabilité des réparations en béton de fibres: Effets du retrait et de la fatigue.” Doctoral thesis, Université Paul Sabatier, Toulouse, France (in French).
8.
Gay, D. ( 1991). Matériaux composites, Hermès, Paris (in French).
9.
Grandhaie F. ( 1993). “Le béton de fibres métalliques amorphes comme nouveau matériau de réparation.” Doctor thesis, Université Paul Sabatier, Toulouse, France (in French).
10.
Granju, J. L. ( 1996). “Thin bonded overlays: About the role of fiber reinforcement on the limitation of their debonding.” Adv. Cement Based Mat., 4, 21–27.
11.
Granaju, J. L., and Chausson, H. ( 1995). “Serviceability of fiber reinforced thin overlays: Relation between cracking and debonding.” Proc., ConChem Int. Exhibition and Conf., 133–142.
12.
Kim, J. K., and Lee, C. S. ( 1998). “Prediction of differential drying shrinkage in concrete.” C.C.R., 28(7), 985–994.
13.
Raoof, M., and Zang, S. ( 1996). “Analysis of plate peeling failure of RC beams with externally bonded plates.” Proc., Concrete, Repair, Rehabilitation and Protection, R. K. Dhir and M. R. Jones, eds., E & FN Spon, London, 583–590.
14.
Saucier, F., and Pigeon, M. ( 1991). “Durability of new-to-old concrete bondings.” Proc., ACI Int. Conf. on Evaluation and Rehabilitation of Concrete Struct. and Innovation in Des., ACI, Detroit, 689–706.
15.
Tutatsinze, A., Farhat, H., and Granju, J.-L. ( 2000). “Durability of metal fibre reinforced concrete repairs: Drying shrinkage effects.” Proc., Brittle Mat. Compos., 6, A. M. Brandt, V. C. Li, and I. H. Marshall, eds., Woodhead Publishing, Cambridge, U.K., and Zturek Research Institute, Warsaw, 296–305.
16.
Varastehour, H., and Hamelin, P. ( 1996a). “Analysis and study of failure mechanism of RC beam strengthened with FRP plates.” Proc., Advanced Compos. Mat. in Bridges and Struct. Conf.
17.
Varastehpour, H., and Hamelin, P. ( 1996b). “Experimental study of RC beams strengthened with CFRP plate.” Proc., Advanced Compos. Mat. in Bridges and Struct. Conf.
18.
Verhoeven, K. ( 1990). “Recouvrements minces en béton de ciment.” Rapport CRIC 526F61990, Centre National de Recherches Scientifiques et Techniques pour l'Industrie Cimentaire, Bruxelles, Belgique (in French).
Information & Authors
Information
Published In
History
Received: Jun 18, 1999
Published online: Apr 1, 2001
Published in print: Apr 2001
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.