RT Journal Article
T1 Ghaleh-khargushi rhyodacite and Gorid andesite from Iran: characterization, uses, and durability
A1 Zalooli, Ahmad
A1 Freire Lista, David Martín
A1 Khamehchiyan, Mashalah
A1 Nikudel, Mohammad Reza
A1 Fort, Rafael
A1 Ghasemi, Shahram
AB Durability of building stones is an important issue in sustainable development. Crystallization of soluble salts is recognized as one of the most destructive weathering agents of building stones. For this reason, durability of Ghaleh-khargushi rhyodacite and Gorid andesite from Iran was investigated against sodium sulfate crystallization aging test. Petrographic and physico-mechanical properties and pore size distribution of these stones were examined before and after the aging test. The characteristics of the microcracks were quantified with fluorescence-impregnated thin sections. Durability and physico-mechanical characteristics of Ghaleh-khargushi rhyodacite are mainly influenced by preferentially oriented preexisting microcracks. Stress induced by salt crystallization led to the widening of preexisting microcracks in Ghaleh-khargushi rhyodacite, as confirmed by the pore size distributions before and after the aging test. The preexisting microcracks of Gorid andesite were attributed to the mechanical stress induced by contraction of lava during cooling. The number of transcrystalline microcracks was significantly increased after the aging test. The degree of plagioclase microcracking was proportional to its size. Durability of the studied stones depends on initial physico-mechanical properties, pore size distribution, and orientation of microcracks. Initial effective porosity is found to be a good indicator of the stones’ durability. Salt crystallization resulted in an increase in the effective porosity with a parallel decrease in the wave velocities. Surface microroughness parameters increased with the development of salt crystallization-induced microcracking. Gorid andesite showed higher quality and durability than Ghaleh-khargushi rhyodacite.
PB Springer
SN ISSN: 1866-6280, online ISSN: 1866-6299
YR 2018
FD 2018-04
LK https://hdl.handle.net/20.500.14352/12160
UL https://hdl.handle.net/20.500.14352/12160
LA eng
NO Comunidad de Madrid
NO University of Tehran
NO Ministry of Science and Technology of Iran
DS Docta Complutense
RD 9 abr 2025