Estimation of the Adherence of Mortars Using Ultrasound

Abstract

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.

Adhesion of Masonry Coating: Effect of Mortar Consistency and Type of Substrate

“…The other two mortars have smaller increases ranging from 8% to 67%. These results contradict the results obtained by Khaldi et al [14]. The authors indicated a decrease in the adhesion of mortars with an increasing thickness.…”

Bonding and Repairing Properties of Fiber-Polymer Mortar for Concrete Repair

“…When (y 0 − y 2 ) 2 takes the minimum value, the mortar strength can be calculated through the strength contour line of the functional relationship between the polymer-cement ratio and Formulas (2) and (3). By inferring and calculating the ratio of the correlation coefficient of the values, if the ratio of the two values is 0.9, it means that the correlation is better [22].…”