JpGU-AGU Joint Meeting 2020

Presentation information

Print

[E] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS19] Conservation of geoparks, natural geosites, and cultural heritage: weathering and damage assessment

convener:Luigi Germinario(Saitama University), Celine Schneider(University of Reims-Champagne-Ardenne), Chiaki T. Oguchi(Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University), Tetsuya Waragai(Graduate School of Science and Engineering, Nihon University), Miguel Gomez-Heras(Universidad Autonoma de Madrid), Patricia Vazquez(GEGENAA EA 3795 University of Reims Champagne-Ardenne), Magdalini Theodoridou(Cardiff University), Wonsuh Song(Waseda University)

[MIS19-02] Detection of microcracks in rock specimens due to thermal changes using the acoustic emission method

*Tetsuya Waragai1 (1.Graduate School of Science and Engineering, Nihon University)

Keywords:thermal weathering, microcrack, acoustic emission, thermal expansion property

The acoustic emission (AE) method can detect microcracks that occur inside rocks. In this study, using the AE method, the temperature change of 80 ℃ at a temperature gradient of 2 ℃/min was given to three kinds of rock specimens (granite, marble, and sandstone) often used for stone cultural heritages, and the microcrack formation was monitored. As a result, it was found that the AE amplitude was largest in the granite specimen and decreased in order of the marble and the sandstone specimens. The AE generation is thought to depend on the mineral composition, the thermal expansion properties of minerals, and the porosity.