Mortar Bond Strength: A Brief Literature Review, Tests for Analysis, New Research Needs and Initial Experiments

Abstract

Despite technological advances in the production processes of the materials for ceramic façade coatings, the problems of detachments are still frequent. Therefore, this work aims to investigate, through a literature review, the existing gaps related to the adhesion ability of adhesive mortars, identifying new research needs that can better explain the behavior of the material. In addition, an experimental procedure was developed to evaluate the mechanical capacity of adhesive mortars when subjected to cyclic stresses. Dynamic stress measurements are presented for several blocks of mortar and on similar blocks but with a slot drilled prior to measurements (intended to represent failure). From these data we calculated values of stress energy, elastic energy, and dissipated energy. The experimental results showed that the energy involved in the test process accompanied the load values and current stress values. The mortar samples with the previous failure absorbed and dissipated less energy than mortars without failure, showing that materials that have less energy to dissipate, are materials that have developed less capacity to adhere, that is, to keep their parts together.

Construction Products between Testing Laboratory and Market Surveillance: Case study of Cementitious Ceramic Tile Adhesives

“…Measurement of tensile adhesion strength represents a destructive test. Recently, Delgado et al published a review on mortar bond tests [ 54 ]. The authors pointed out that the tensile adhesion strength test is characterized by a high variability in the obtained results also due to other inherent factors related to the procedure of application of CTAs and the equipment itself [ 54 ].…”

“…Recently, Delgado et al published a review on mortar bond tests [ 54 ]. The authors pointed out that the tensile adhesion strength test is characterized by a high variability in the obtained results also due to other inherent factors related to the procedure of application of CTAs and the equipment itself [ 54 ]. Delgado et al suggested examining another characteristic parallel if the product is assessed using the tensile adhesion method [ 54 ].…”

Assessment of the possibility of using the measurement of open time to assess and verify the constancy of performance of cementitious ceramic tile adhesives

“…Tak znaczny rozrzut wyników pomiaru czasu otwartego wyznaczanego poprzez oznaczenie przyczepności wskazuje, że ta metoda ma zbyt małą dokładność. Ten rozrzut jednoznacznie wskazuje, że metoda ta nie może być wykorzystywana w procesie AVCP.Warto nadmienić, że w ostatnim czasie formułowane są postulaty, że ze względu na fakt, że pomiar przyczepności to metoda destrukcyjna charakteryzująca się znaczną zmiennością(40), w ocenie wyrobów budowlanych należy stosować ją równocześnie z inną metodą pomiarową(16,41) . Wyniki oznaczenia czasu otwartego CTA po czasie nie krótszym niż 30 minut zaprezentowane w niniejszej pracy potwierdzają, że wykorzystywanie jedynie wyników pomiaru przyczepności do oceny zgodności wiąże się ze znacznym ryzykiem błędnej oceny.…”