Effects of moisture content on Liquid transport properties ( Permeability and suction pressure ) and mechanical properties ( Young's modulus, yield stress and tensile strength ) of drying shrinkage mate~i a l s ( Kibnshi, Haido and mixed clay ) were measured and a strong dependence was found. When glass beads are added to the Kibushi, permeability increase and Young's modulus and yield stress decrease in spite of the same suction pressure and tensile strength. Changes in local moisture content and stress during drying was calculated by using finite-element method, taking into account the stress gradient in addition to the pressure gradient due to osmotic suction.
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SHISHIDO, SUZUKI, AND OHTANICalculated local moisture content showed good agreement with experimental values. Calculated results showed the occurrence of tensile stress in the material under certain conditions. Stress in the mixed clay seemed to be smaller in value than in Kibushi, and from this result, possibility of avoidance of cracking may be confirmed by adding a small amount of glass beads, even under high-speed drying conditions.
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