RT Journal Article
T1 The influence of petrographic properties on mechanical characteristics and the durability of the greenschist subjected to simulated weathering tests
A1 Zalooli, Ahmad
A1 Khamehchiyan, Mashalah
A1 Nikudel, Mohammad Reza
A1 Fort González, Rafael
A1 Ghasemi, Shahram
A1 Freire Lista, David Martín
AB Despite the wide use of greenschists as a building stone, few studies have been conducted on their resistance to both physical and chemical weathering processes. The present study investigates the petrographic and physico-mechanical characteristics of the Abrangi building greenschist from Iran. In addition, it evaluates the resistance of the stone to three simulated weathering tests, including salt crystallization, frost action, and acid solution. The loss in integrity and esthetic damage caused by simulated weathering tests are quantified using P-wave velocity and colorimetry tests. Moreover, fluorescence microscopy (crack studies) and SEM–EDX techniques are applied to investigate the evolution of stone fabric caused by salt crystallization and wetting–drying in an acid solution, respectively. The results showed the quality of Abrangi greenschist is controlled by its compositionally banded texture. Mechanical damage was localized in tremolite-rich bands. Meanwhile, chemical decay was observed in granoblastic bands, where calcite and epidote were embedded within the bands. Furthermore, it was observed that tremolite-rich bands were highly damaged when the compressive stress was applied in the direction parallel to the longitudinal axis of the fibers. However, fiber bundles were cleaved into thinner or single fibers by applying the tensile stress perpendicular to the longitudinal axis of the fibers. It is noteworthy that this tensile strength is induced by the Brazilian tensile strength tester and salt crystallization weathering test. Wetting–drying in sulfuric acid caused the formation and accumulation of gypsum crystals on etched calcite and epidote crystals or adjacent voids in granoblastic bands.
PB Springer
SN 0723-2632
YR 2024
FD 2024-01-23
LK https://hdl.handle.net/20.500.14352/104287
UL https://hdl.handle.net/20.500.14352/104287
LA eng
NO Zalooli, Ahmad, et al. «The Influence of Petrographic Properties on Mechanical Characteristics and the Durability of the Greenschist Subjected to Simulated Weathering Tests». Rock Mechanics and Rock Engineering, vol. 57, n.o 5, mayo de 2024, pp. 3393-408
NO Iran National Science Foundation
NO Tarbiat Modares University of Iran
NO IGEO (CSIC-UCM)
NO Coimbra University
NO Trás-os-Monte e Alto Douro University
NO Fundaçao para a Ciencia e a Tecnologia
DS Docta Complutense
RD 18 abr 2025