Abstract
The paper focuses on the debonding between a cement-based overlay and a concrete substrate under a mechanical loading. Two categories of substrate surface preparation were considered: Sawing the Substrate and Sand Blasting of the casting surface of the substrate. Untreated substrate surface used in its original state was taken as the Reference Surface. The overlay material investigated was a cement-based mortar. Direct tensile tests perpendicular to the overlay-substrate interface were carried out at the age of 28 days and the results (tensile strength, residual post peak behavior) are presented and discussed. Attention was paid to the Sand Blasted surface which is a more realistic model of practical field conditions. The debonding propagation under monotonie and fatigue loading was monitored for sand blasted surfaces using the Digital Image Correlation technique. Results indicate that both surface preparation technique has its own efficiency level and gives different roughness. Among the techniques used, greater bond strength improvement was observed with the sawn substrate surface than with the sandblasted one. Moreover, under cyclic loading, major debonding along the interface occurs from the first cycle to the 20000th cycle and is negligible thereafter.
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Our thanks are extended to Susan Becker, a native English speaker, professor of English at University of Toulouse, commissioned to proofread the final version of this paper.
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Gillani, S.A.A., Toumi, A. & Turatsinze, A. Effect of surface preparation of substrate on bond tensile strength of thin bonded cement-based overlays. Int. J. Pavement Res. Technol. 13, 197–204 (2020). https://doi.org/10.1007/s42947-019-0101-5
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DOI: https://doi.org/10.1007/s42947-019-0101-5