Microscopic and Macroscopic Physical Properties of Meta-chert

Koki Maekawa; Wei Wang; Hamza Samouh; Shunsuke Ishikawa; Osamu Kontani; Takahiro Ohkubo; Kenta Murakami; Kiyoteru Suzuki; Maruyama, Ippei

doi:10.51094/jxiv.191

##article.authors##

Koki Maekawa Graduate School of Environmental Studies, Nagoya University
Wei Wang Graduate School of Engineering, The University of Tokyo
Hamza Samouh Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign
Shunsuke Ishikawa Nuclear Power Department, Kajima Corporation
Osamu Kontani Nuclear Power Department, Kajima Corporation
Takahiro Ohkubo Graduate School of Engineering, Chiba University
Kenta Murakami Graduate School of Engineering, The University of Tokyo
Kiyoteru Suzuki Societal Safety and Industrial Innovation Division, Mitsubishi Research Institute, Inc.
Maruyama, Ippei Graduate School of Engineering, The University of Tokyo

DOI:

https://doi.org/10.51094/jxiv.191

キーワード:

Digital image correlation method、 Coefficient of thermal expansion、 Aggregate、 Direct tensile test、 Natural fracture

抄録

Herein, to determine the methods of obtaining various properties of aggregates, quartz-rich quartzite is selected, two types of different regions in aggregate, a region (white region) where quartz grains are densely compacted and another region (gray region) where quartz grains are secondarily formed coarsely, are tested for the linear expansion coefficient, and the tensile strength and Young’s modulus. The microscopic data were compared with macroscopic data. Young’s modulus is not significantly different between that of macroscopic compression and that of microscopic tension loading in the white region. Macroscopic splitting tensile strength shows bimodal behavior due to the failure mechanisms dominated by two different regions, which was experimentally confirmed by the data of the microscopic direct tensile loading test. The coefficients of thermal expansion of the macroscopic test are similar to that of the microscopic experiment for the white region, which is well reflected by the nature of quartz, on the contrary, the microscopic coefficient of thermal expansion of the gray region shows completely different behavior.

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