Abstract
The interfacial thermal resistance at the interfacial transition zone (ITZ) between coarse aggregate and mortar was measured. The experimental results show that the interfacial thermal resistance varies with the type of coarse aggregate, and decreases with increasing saturation degree and surface roughness of coarse aggregate. When the saturation degree rises to 100%, the interfacial thermal resistance becomes negligible. Subsequently, a mesoscale numerical model considering interfacial thermal resistance was developed to estimate the thermal conductivity of unsaturated concrete. The model was validated based on experimental results and then applied to investigate the influence of coarse aggregate content, size, and shape on the thermal conductivity of unsaturated concrete. The simulation results demonstrate that due to the interfacial thermal resistance, the thermal conductivity of unsaturated concrete not only depends on the thermal conductivity and volume fractions of mortar and aggregate, but also on the aggregate size and shape. In addition, due to the interfacial thermal resistance, the aggregate orientation may induce anisotropy in the thermal conductivity of unsaturated concrete.
Published Version
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