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This report Clescribes tWo methods for deterrpining the compressive strength of high ・ st爬 ngth concrete subjected to high − temperature heating ． 皿 le f(〕nowing conclusions were obtained ． 1・ 皿 ecompressive strength of high− strenglh concrete subjected to high− tempe 【ature heating can be dete 皿 ined・ from・ hea重ing temperature and comp 【essive st 爬 ngth at 28 days． 2． 跏 ecompressive stre皿 gtb of high − strength concrete after heating can be deterTnined frem pore volume rate and coMpressive strength at 20 ℃ ． 3． Two strength equations basod on an eXperimenta1 result were p 【oposed by making heating temperatu 爬 aparameter ， and 重 his verified that experiment values ． and correlation were geod ，

In this study, the authors prepared sintered samples of (Zr 0:58 Pu 0:21 Am 0:21 )N, (Zr 0:80 Pu 0:10 Am 0:10 )N, and (Zr 0:70 Np 0:06 Pu 0:15 Am 0:075 Cm 0:015 )N solid solutions. The thermal diffusivities and heat capacities of these Zr-based transuranium nitride solid solutions were measured using a laser flash method and drop calorimetry, respectively. Thermal conductivities from 473 to 1,473 K were determined from the measured thermal diffusivity, heat capacity, and bulk density. The thermal conductivities of Zr-based transuranium nitride solid solutions were found to be higher than that of (Pu 0:5 Am 0:5 )N due to the high thermal conductivity of ZrN as the principal component, although they were lower than that of ZrN due to the impurifying effect of the transuranium elements. At 873 K, the thermal conductivities of ZrN, 9, 15.8, 25.5, 20.6, and 8.9 Wm À1 K À1 , respectively. In these results, the thermal conductivities of the Zr-based transuranium nitride solid solutions increased with increasing ZrN concentration.