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1

Estimation of the adherence of mortars using ultrasound

Khaldi Nacera, Belachia Mouloud, Benouis Abdelhalim

Civil and Environmental Engineering Reports

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2020

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Vol. 30, no. 2

185--199

EN

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.

2

Ocena przyczepności metodą impact-echo w układach naprawionych

Piotrowski T., Garbacz A.

Materiały Budowlane

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2010

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nr 2

30-31

3

Analiza oceny przyczepności adhezyjnych powłok regeneracyjnych.

Jósko M.

Zagadnienia Eksploatacji Maszyn

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2002

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Vol. 37, nr 2

131-140

PL

W pracy dokonano analizy nieniszczących metod oceny połączeń adhezyjnych, na podstawie której wskazano na predystynkcje metody ultradźwiękowej do oceny tych połączeń. Krytyczne ujęcie problemu pozwoliło sformułować własne postulaty badawcze, dotyczące ultradźwiękowych badań przyczepności powłok regeneracyjnych. Przedstawiono algorytm realizacji zadań badawczych w celu opracowania ultradźwiękowej metody oceny stanu połączenia powłoki z podłożem na różnych etapach jego istnienia.

EN

The paper deals with an analysis of the methods of nondestructive evaluation of adherence of renovative coatings. The introduction presents a conception of adherence of renovative coatings and a purpose of the work. Next, an analysis of some nondestructive methods of evaluation of adhesive bonds is carried out. From among of various nondestructive methods, a group of ultrasonic methods possesses a particular predispositions to evaluation of adhesive bonds, especially to the bonds between coating and substrate. Some ultrasonic waves, as longitudinal, transverse, surface, subsurface, can be used not only for defects detection on the boundary region between coating and substrate, but also for monitoring of the bonds type coating-substrate during their mechanical loading. On the basis of particular possibilities of ultrasonic waves, and the needs of the adherence evaluation, some research tasks to solve the problem of nondestructive evaluation of the adherence of renovative coatings are suggested in the work. As the results of the analysis, a diagnostic approach to the studied problem of adhesion evaluation is presented. This approach consists of treating of ultrasonic evaluation of the bond between coatings and substrate as the method of an condition assessment of these bonds. Besides of some research tasks, the way their connections, in the form of algorithm is shown. In the algorithm those tasks are logically comprised. The realization of the tasks leads to the elaboration of the method of condition evaluation of the bond between coating and substrate on various stages of life-period of the bonds considered.