Abstract
The objective of this research is to analyze the influence of granulometric composition of sand, application energy, and substrates superficial tension on the contact area of rendering mortars. Three different substrates were selected with distinct wetting behaviors: polyethylene, acrylic, and glass. The contact angle of drop water was measured by goniometer. Mortars were prepared with cement:lime:sand ratios of 1:0:3, 1:1:6, and 1:2:9, by content converted in mass, with sand composition of 25 % of each 0.15, 0.3, 0.6, and 1.2 mm grain sizes. Characterization tests in fresh and hardened mortars were performed to provide the technological control of mortars and concretes, as well as the characterization of the different rheological behaviors of the mortars by squeeze-flow and rotational rheometer methods. Mortars were applied to substrates with two different energies, and after curing time were parted from substrates and submitted to scanner 3D digitalization of interfacial area. Results showed that both mortar proportion and substrate superficial tension exercise influence on interfacial contact area development. Additionally, interaction between application energy and substrates superficial tension was significantly influent on contact area. Finally, 3D scanning is a promising new method that shows good performance to measure contact area to improve the understanding of bond strength.
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Acknowledgments
The authors appreciate the financial support of CNPq (Conselho Nacional de Desenvolvimento Tecnológico—Brazilian Council of Technological Development) and CAPES (Fundação Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazilian Ministry of Education).
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Stolz, C.M., Borges Masuero, A. (2016). Analysis of Main Parameters that Affect Contact Area Between Mortar Rendering and Substrate: Use of 3D Laser Scanning Technique. In: Delgado, J. (eds) Recent Developments in Building Diagnosis Techniques. Building Pathology and Rehabilitation, vol 5. Springer, Singapore. https://doi.org/10.1007/978-981-10-0466-7_2
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DOI: https://doi.org/10.1007/978-981-10-0466-7_2
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