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An Experimental Investigation on the Effects of Temperature on Soil-Concrete Interface Systems
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The shear strength of smooth concrete-soil interface was found to increase when the temperature rose from 20 to 35⁰C, but independent of temperature between 35 and 50⁰C. Also, thermal cycles appeared to have no effect on the interface shear strength. Only minor drop in interface shear strength was observed when the number of thermal cycles increased. However it seems that the increase of the number of thermal cycles influenced the soils moisture state leading to dryer soil involved in the soil-concrete interface shearing. In terms of the modified triaxial thermal conductivity test, results showed that the confining stress had slight influence on highly compacted soils. For loosely compacted soils, a considerable increase in thermal conductivity was observed when the confining stress was increased, this was caused by density changes. It was concluded that the thermal conductivity of a soil was predominantly determined by its level of compactness, moisture content and confining stress.