Research on Thermal Conductivities of Composite Soil

• Main Authors: Jean, Chung-Tzong, 簡城宗
• Other Authors: Yong-Ming Tien
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/66401125774746623766

碩士 === 國立中央大學 === 土木工程學系 === 84 === The thermal problem civil engineering always faces is how to control the situation of heat dissipating or insulation between structures and surroundingenvironment. The thermal properties like coefficient of thermal conductivity design or determination of buffer materials around some special underground structures would be the important key. To obtain a desired thermal conductivi-ty, mixing two kinds of soil material possessing different thermal properties at various volumetric fractions was usually economical and probable. A heat-flow-meter method was used to measure the thermal conductivities of mixtures of two dry porous materials. Also we observed the relationship between thermal conductivities and volumetric fractions of composites. Mix- tures that owned two kinds of particles and porous could be regarded as a three- phases system coming from two kinds of two-phases materials that owned only one kind particle and porous. A constituent volumetric fraction model was conducted to distinguish the very respective fractions and thermal con- ductivities of the two composites. Both they''re two-phases materials. Results indicated that the high-thermal-conductivity materials had a pronounced influ-ence on the heat-conduction process in the composite mixtures. Evaluations andcomparisons with some theories also indicated that prediction value all well agreed with experiment value.