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http://dx.doi.org/10.9719/EEG.2019.52.6.587

Research for Crack Generation and Propagation of Daejeon Granite under Stress Conditions  

Choi, Junghae (Department of Earth Science Education, Kyungpook National University)
Kim, Hye-jin (Kyungnam branch office, Human resources development service of Korea)
Chae, Byung-gon (Policy and planning division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.52, no.6, 2019 , pp. 587-593 More about this Journal
Abstract
This study were subjected to accelerated weathering test under freeze-thaw and pressure conditions to observe initiation and propagation of cracks using CLSM. Applied stress was set at 50 MPa, 55 MPa, 70 MPa for 3 samples each by using compressor and freeze-thaw experiment was conducted while samples maintained that condition. In freeze-thaw experiments, a temperature range was set to -20~40℃ which was 1 cycle for 6 hours. The freeze-thaw cycle was composed of time which reached to set temperature for 1 hour and holding time for 2 hours. On the basis of this cycle, surface of samples was observed by CLSM after each 20 freeze-thaw cycle. From this research, according to increase freeze-thaw cycle, there were 7, 10, 19 each cracks and High pressured sample's accumulate length was longer than low pressured sample's. High pressured sample's crack velocities were also faster than low pressured sample's which were calculated by accumulate length and freeze-thaw cycle.
Keywords
confocal laser scanning microscope; crack generation; crack propagation; freeze/thaw experiment; crack generation velocity;
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Times Cited By KSCI : 4  (Citation Analysis)
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