Mechanical, Thermal Properties and Permeability of Rocks under High Temperature

Influence of mineral composition of siliceous rock on its volume change

“…However, data on each mineral is scarce, as evidenced by the authors' literature review [40][41][42][43][44][45][46][47]. In particular, there is little information about the thermal expansion coefficient of expansive clay minerals.…”

“…In their method, the thermal expansion coefficient of the other minerals cannot be neglected, but their influence is considered as the intercept of the y-axis in the regression analysis. In the present study, particular attention was paid to the expansion coefficient of quartz, which is larger than the other expansive clay minerals [45], and the relationship between quartz amount and thermal expansion coefficient were evaluated (as shown in Fig. 15, where quartz data [46] is also shown).…”

Effects of emergency preservation measures following excavation of mural paintings in Takamatsuzuka Tumulus

“…The measured value is used for equilibrium moisture content and the thermal conductivity of the mound surrounding the stone chamber, and moisture conductivity is derived from the measured equilibrium moisture content (Khalil and Ishizaki, 2007) and particle size distribution of the surrounding soil, according to the Arya-Paris model (Arya et al, 1999). The stone chamber is composed of tuff, and the equilibrium moisture content, thermal conductivity, and moisture conductivity of tuff are derived from reference values (Kitano et al, 1988;Kodai, 1984; Monthly accumulative rainfall (mm) Figure 5. Monthly rainfall (Nala, Japan).…”

“…The measured value is used for equilibrium moisture content and the thermal conductivity (Ishizaki et al, 2006) of the mound surrounding the stone chamber, and moisture conductivity is derived from the measured equilibrium moisture content (Khalil and Ishizaki, 2007) and particle size distribution (Ishizaki et al, 2006) of the surrounding soil, according to the Arya–Paris model (Arya et al, 1999). The stone chamber is composed of tuff, and the equilibrium moisture content, thermal conductivity, and moisture conductivity of tuff are derived from reference values (Kitano et al, 1988; Kodai, 1984; Takahashi et al, 1999). Figures 7 to 10 show the thermal conductivity, equilibrium moisture content, moisture conductivity, and moisture conductivity (gas phase) related to the gradient of water chemical potential, respectively, of tuff and soil, and Figure 11 shows its moisture conductivity related to temperature gradient.…”

Physical and Thermal Properties of Concrete Subjected to High Temperature

“…31), the thermal expansion strain of limestone concrete becomes larger than that of sandstone concrete above 500°C. The thermal expansion strain of limestone has large anisotropy (Kitano et al 1988), so the micro damage of interface between mortar and aggregate, which is caused by the difference in the thermal expansion of limestone used in this study at a temperature of 500°C may result in a decrease in the strength of limestone concrete. …”