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. 2022 Mar 21;15(6):2332.
doi: 10.3390/ma15062332.

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

Janaina Salustio  1   2 , Sandro M Torres  3 , Anne C Melo  4 , Ângelo J Costa E Silva  5 , António C Azevedo  6   7 , Jennef C Tavares  2   8 , Matheus S Leal  9 , João M P Q Delgado  7
Affiliations

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

Janaina Salustio et al. Materials (Basel). .

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.

Keywords: adhesive; bond strength; cyclic stresses; elastic energy; experimental campaign; slots.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Prismatic sticky mortar samples: (A) detail of the slot with 9 mm height and (B) example of a sample fitted for the tests and the equipment used.
Figure 2
Figure 2
Hysteresis curves of the bending tensile strength test with cyclic loads of Solid-B samples: (A) 1000 cycles, (B) 2000 cycles, (C) 3000 cycles, and (D) 4000 cycles.
Figure 3
Figure 3
The central section of the hysteresis curves of the bending tensile strength test with cyclic loads of the Solid-B samples: (A) all 6000 cycles, (B) 1000 cycles, (C) 2000 cycles, (D) 3000 cycles, and (E) 4000 cycles.
Figure 4
Figure 4
Single crack formed during the test: (A) sample after test; and (B) detail of the slot formed in the central axis of the previous failure.
See this image and copyright information in PMC

References

    1. National Association of Ceramic Manufacturers for Coating Industry Numbers. 2021. [(accessed on 13 November 2021)]. Available online: http://www.anfacer.com.br.
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    1. Kulesza M., Debski D., Fangrat J., Michalak J. Effect of re-dispersible polymer powders on selected mechanical properties of thin-bed cementitious mortars. Cem. Wapno Beton. 2020;25:168–177.

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