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Peeling tests for assessing the cohesion and consolidation characteristics of mortar and render surfaces

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Abstract

Standard principles for applying the so-called Scotch tape test for assessing the surface cohesion characteristics of materials were explained in an earlier paper on testing stone consolidation effects (Drdácký et al., Mater Struct 45(4):505–520, 2012). The method has also been used for evaluating the strengthening of surface mortar layers, though it is not supported by any standard or reliably verified recommendations for its application. As in the case of stone testing, its applicability can be overestimated, and arbitrary use of the test without adequate knowledge and sufficient understanding can lead to results and assessments that are not intercomparable or reproducible, and which are also in many cases incorrect and severely biased. This paper reports on the results of a recent study aimed at establishing limits for the application, reliable procedures, and a “standard” protocol for testing the cohesion characteristics of brittle and quasi-brittle materials, mainly mortars. This paper discusses the effects of various surface qualities of mortar or rendering, and suggests recommendations for performing peeling tests on mortar surfaces. It presents a mathematical procedure suitable for evaluating the results. Again the recommendation is to perform repeated peeling on an identical place on a surface in order to eliminate the effect of the natural decrease in the material detached from the subsurface layers, which might be incorrectly interpreted as a consolidation effect. The examples and the validation measurements presented here include laboratory measurements.

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Notes

  1. SME targeted Collaborative Research Project “Stone conservation for refurbishment of buildings” supported from Grant No. 0.213651 under the EC 7th Framework Programme, coordinated by Prof. Dr. Gerald Ziegenbalg, IBZ Freiberg, Germany.

References

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Acknowledgments

This paper is based on results and experience acquired with support from Czech Grant Agency Grant No. P105/12/G059 in the Centre of Excellence Telč supported by project CZ.1.05/1.1.00/02.0060 from European Regional Development Fund and the Ministry of Education, Youth and Sport the Czech Republic. The authors are grateful to Dr. Zuzana Slížková for her collaboration during the tests on mortars after consolidation, and to Hana Hasníková for her kind help with the tests on commercial one-sided adhesive labels.

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Authors and Affiliations

  1. Institute of Theoretical and Applied Mechanics of the Academy of Sciences of the Czech Republic, Prosecká 76, 190 00, Praha 9, Czech Republic

    Miloš Drdácký, Jaroslav Lesák, Krzysztof Niedoba & Jaroslav Valach

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  1. Miloš Drdácký
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  2. Jaroslav Lesák
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  3. Krzysztof Niedoba
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  4. Jaroslav Valach
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Correspondence to Miloš Drdácký.

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Drdácký, M., Lesák, J., Niedoba, K. et al. Peeling tests for assessing the cohesion and consolidation characteristics of mortar and render surfaces. Mater Struct 48, 1947–1963 (2015). https://doi.org/10.1617/s11527-014-0285-8

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  • DOI: https://doi.org/10.1617/s11527-014-0285-8

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