Abstract
The flow properties of particles and powder were measured by the improved direct shear tester. This shear tester has the following features.: (1) the actual vertical stress acting on the shearing surface can be measured. (2) PYL can be measured by constant volume shearing as well as by constant vertical stress shearing. (3) WYL also can be measured easily.
From the experimental results obtained using this shear tester, the availability of this tester was proved, and the importance of measurement of actual vertical stress acting on the shearig surface was confirmed.
