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Mechanisms of ASR surface cracking in a massive concrete cylinder
Kagimoto, Hiroyuki,Yasuda, Yukihiro,Kawamura, Mitsunori Techno-Press 2015 Advances in concrete construction Vol.3 No.1
Relative humidity and strains within a massive concrete cylinder (${\varphi}450mm{\times}900mm$) in the drying and the re-saturating process were measured for elucidating the process of ASR surface cracking in concrete. The expansion behavior of mortars in dry atmospheres with various R.H. values and the resaturating process was revealed. Non- or less-expansive layers were formed in near-surface regions in the concrete cylinder in the drying process, but ASR expansions actively progressed in inner portions. After resaturating, R.H. values of near-surface regions rapidly increased with time, but expansions in the regions were found to be very small. However, in the middle portions, of which R.H. values were kept 80% ~ 90% R.H. in the drying process, expansion actively progressed, resulting in further development of surface cracks in the re-saturating process.
Thermoelectric Properties of the Kondo Semiconductor CeRu4As12 Prepared under High Pressure
Chihiro Sekine,Tomokazu Kawata,Yukihiro Kawamura,Takehiko Yagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The thermoelectric properties of the Kondo semiconductor CeRu4As12 with a filled skutteruditetypestructure have been studied. The compound CeRu4As12 exhibits a hybridization gap insulatingstate with a small activation energy of 50 K. We report further results for CeRu4As12 synthesized athigh temperatures and high pressures. Seebeck-coefficient and thermal-conductivity measurementshave been performed on this material. The temperature dependence of the Seebeck coefficient forCeRu4As12 shows two peaks (around 90 K and 280 K). The phenomena could be related to theKondo behavior at high temperatures and a hybridization gap-formation process at low temperatures.