An Improved Thermal Conductivity Model for Unsaturated Clay

The thermal properties of soils vary because of the different textures of soils; thus, it is valuable to conduct research on the development of thermal conductivity models for soils with different textures. Clay samples with different dry densities and increasing incremental water contents were prep...

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Bibliographic Details
Published in:KSCE journal of civil engineering 2020, 24(8), , pp.2364-2371
Main Authors: Song, Xinye, Fan, Henghui, Liu, Jiawei, Yang, Xiujuan
Format: Article
Language:English
Subjects:
Civil Engineering
Clay
Clay minerals
Conductivity
Dry density
Engineering
Geotechnical Engineering
Geotechnical Engineering & Applied Earth Sciences
Heat conductivity
Heat transfer
Industrial Pollution Prevention
Model accuracy
Moisture content
Soil
Soil conductivity
Soil properties
Soil texture
Soils
Thermal conductivity
Thermal properties
Thermodynamic properties
Transient plane source technique
Water content
토목공학
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Summary:The thermal properties of soils vary because of the different textures of soils; thus, it is valuable to conduct research on the development of thermal conductivity models for soils with different textures. Clay samples with different dry densities and increasing incremental water contents were prepared, their thermal conductivities were measured by the transient plane source (TPS) method. The experimental results show that the thermal conductivity of clay increases with increasing water content and dry density. The water content has a stronger influence than the dry density on the thermal conductivity. This paper presents an improved model to predict the thermal conductivity of unsaturated clay. The model considers the different contributions of minerals in the soil and the distribution of water and air in pores. The accuracy of the model is verified by soil thermal conductivity data that was previously measured and collected from ten regions. Compared with the three similar models proposed in the literature, the new model proposed in this paper has a higher degree of correlation to describe the thermal conductivity of clay.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-020-1812-5