湿潤粉体の強度特性と毛管力
1984 年 100 巻 1151 号 p. 35-40
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1984 年 100 巻 1151 号 p. 35-40
Among the various properties required for agglomerates, strength is the most preferential common element, and related to bonding mechanism in the agglomerate.
In this study compression tests were carried out on moist agglomerates consisting of granular materials which differed in mean particle-size, particle-shape and size-distribution. Moist test-specimens were prepared by dewatering from a paste of materials in a cylindrical mold, after vibrating it.
It was confirmed that the strength of test-specimens were presented in terms of isostatic tencile-stress Pi caused by water in voids and angle of internal friction of the moist agglomerate.
Pi can be described as a function of void fraction, mean particle-diameter from permeability and degree of water saturation. The values of Pi in the funicular state, as a whole, increase linearly with saturation from the value in the pendular state (s=0.15) to the entry suction-pressure in the capillary state. But considered thisfrom a different point of view, it is recognized that experimental points show a gentle slope in the range of 0.7-0.8 saturation.
