Estimation of the Adherence of Mortars Using Ultrasound
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Department of civil engineering, University of 20 August 1955, Skikda, Algeria
LMGHU Laboratory, University of 20 August 1955, Skikda, Algeria
Department of civil engineering and hydraulics, University 8 May 1945, Guelma, Algeria
Laboratory of Civil Engineering and hydraulics, University of 8 May 1945, Guelma, Algeria
Online publication date: 2020-08-20
Publication date: 2020-06-01
Civil and Environmental Engineering Reports 2020;30(2):185–199
Mortars are subjected to severe external stresses such as freezing, thawing, and drying during their lifetime. These stresses can lead to a loss of adhesion between the support and the mortar. The strength of the substrates with respect to their ability to receive a coating (mortar) is characterized in particular by the value of minimum tear resistance of the surface to be coated. In this work, the use of a non-destructive method which is both fast and easy to implement is employed to evaluate this support-mortar adhesion. The first method is based on the measurement of the velocities of the surface ultrasonic waves and the second by tearing tests using a specific dynamometer. The determination of the adhesion strength concerned two different supports (concrete beam and masonry block) coated with two types of mortar (a prepared cement mortar and a ready-to-use mortar) with two different thicknesses for each mortar (1 and 2 cm, respectively). The results of the two methods are then correlated for an estimation of the adhesion of the mortars.
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