Investigation of the change in physical, mechanical, and microstructural properties of Ahlat ignimbrites under the effect of environment and freeze-thawing.

Creative Commons License

Akbulut Z. F.

ARABIAN JOURNAL OF GEOSCIENCES, vol.15, no.6, pp.1-11, 2022 (Peer-Reviewed Journal)


This study aimed to investigate the changes in physical, mechanical, and microstructural properties of Ahlat ignimbrites, which have been widely used in the exterior of buildings in modern architecture from the past to the present, particularly in the Van Lake basin of our country, at room conditions and after freeze-thaw cycles. For this purpose, four different colored Ahlat ignimbrites obtained from the quarries in the region were analyzed for the following properties; changes in unit volume weight, apparent porosity, water absorption rates by weight, ultrasound pulse velocities, uniaxial compressive strengths, and flexural strength, as a result of 10, 30 and 50 freeze-thaw (F-T) cycles compared to room conditions. In addition, the changes in each stone's microstructure properties were examined using SEM analyzes performed individually at ambient conditions and after 50 F-T cycles. According to the findings, it was established that as the number of freeze-thaw cycles of these stones increased, their internal structure properties deteriorated significantly, resulting in considerable losses in their physical and mechanical properties.