Durability of Ornamental Gneiss Stones From Pádua, Rio De Janeiro, Brazil
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 7
Abstract
Ornamental stones weaken with exposure to weathering. Consequently, anomalies such as disintegration and cracks appear, making degradation studies necessary. Durability studies are necessary to determine the useful life of the material. In this study, gneiss specimens were divided into three lots: the first was a standard specimen, not aged, used as a control; the second was subjected to accelerated degradation in the laboratory; and the third was degraded naturally under local weathering conditions. After the two degradation processes, the weakening of the stone from wear and flexing was evaluated in relation to the control specimen over time, yielding correlation coefficients greater than 0.90. The correlation curve fit indicated that it is possible to evaluate the durability of the materials by determining the susceptibility of the material to alterations. A loss of flexural strength of up to 34% was observed after 5 years of local weathering, and was also simulated in 70 days of accelerated laboratory tests. This decline also was correlated by means of porosimetry of the stone after being subjected to the degradation processes, which exhibited a reduction in rigidity over a short period in the built environment.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior–Brasil (CAPES), Finance code 001. The authors are thankful to Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ—E-26/203.243/2016) for the additional financial support and to the Serraria de Granito Olho do Pombo for providing the ornamental stone samples.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 18, 2019
Accepted: Dec 27, 2019
Published online: Apr 25, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 25, 2020
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