Micro- and Macro-scale Mechanical Properties of Meta-cherts as Concrete Aggregates
Koki Maekawa, Wei Wang, Hamza Samouh, Shunsuke Ishikawa, Osamu Kontani, Takahiro Ohkubo, Kenta Murakami, Kiyoteru Suzuki, Ippei Maruyama
This paper presents the measurement of the tensile strength, Young’s modulus, and linear coefficient of thermal expansion in a meta-chert. Two areas are targeted in this aggregate ? a white area where quartz grains are densely compacted and a gray area where the quartz grains are coarser. The macro- and micro-scale data are compared. Young’s modulus is not significantly different between macro-scale compression and micro-scale tension loading in the white region. Macro-scale splitting and micro-scale direct tensile strengths exhibit similar bimodal behavior due to the failure mechanisms of these two distinct areas. The macro- and micro-scale coefficients of thermal expansion are similar for the gray region, reflecting the quartz nature. Conversely, the micro-scale coefficient of thermal expansion of the white area shows a different behavior.