—The objective of this work was to study the effect
of temperature variation on the adherence of granite plates
fixed with adhesive mortars on external flooring and exterior
cladding. The rock selected was a commercially well accepted
syenogranite, known as Vermelho Capao Bonito, which has
excellent technological qualities and high aesthetic value.
Tensile bond strength and pullout tests were performed
according to the techniques proposed for ceramic materials, in
view of the lack of standards for dimension stones. The test
specimens were set on standard substrates with two types of
mortars, one commercially manufactured by a leader company
and the other developed in laboratory. After normal curing
conditions (28 days at 23°C and relative humidity of 65%), the
adhesion tests were performed at the following temperatures:
23ºC, 30°C, 40°C, 50°C and 60°C. With increasing temperature
the results indicated a decrease in adhesion values of 48% to
42%, from 2.04 to 1.13 MPa for the one developed in the
laboratory and from 1.92 to 1.12 MPa for the commercial
mortar. The behavior of the microstructure on the standard
substrate-mortar-rock interfaces were also investigated by
optical microscopy, and no signs of reaction or penetration of
mortars into the rock (anchoring) were observed. With regard
to the adhesion values, temperature variation was an important
factor to its decrease, offering important perspectives for new
experiments with other types of granites, for studies of
displacements and pathologies commonly observed in external
cladding made with plates of these materials.
—Granite, mortar, adhesion.
R. P. Ribeiro and A. B. Paraguassú are with the Engineering Geotechnical
Department, University of São Paulo, São Carlos, SP 13566-590 Brazil
(e-mail: email@example.com, firstname.lastname@example.org).
S. T. F. Moreiras is with the Technology Department, State University of
Maringá, Umuarama, PR 87506-370 Brazil (e-mail: email@example.com).
Cite: Rogério P. Ribeiro, Antenor B. Paraguassú, and Sérgio T. F. Moreiras, "Adherence of Granite Plates by Mortar Adhesion:
Influence of Temperature," International Journal of Engineering and Technology vol. 7, no. 5, pp. 401-404, 2015.