Authors: Adam P Poloski Paul R Bredt Richard C Daniel Avelino Eduardo Saez
Publish Date: 2006/05/23
Volume: 46, Issue: 2, Pages: 249-259
Abstract
This paper investigates the use of the shear vane technique as a means of determining frictional and cohesive interparticle force contributions to the shear strength of coarse glass bead powders and slurries To this end the shear strength of 203μm glass beads in air and slurried in water and kaolinite suspensions was determined as a function of vane immersion depth vane geometry and container size Both vane immersion depth and container diameter are found to significantly impact the shear strength measured using the vane technique An equation describing interparticle frictional and cohesive contributions to shear vane measurements was derived in an effort to describe the experimental results A Janssen stress distribution model for granular materials forms the basis for this equation and appears to explain the behavior of shear strength measurements at varying immersion depths The presence of the Janssen stress distribution can affect the interpretation of shear vane results Rather than shear strength being a material property as is the case with flocculated colloid slurries and polymer solutions shear strength becomes a process property where vane depth container size and container material can result in significant measurement variations Such parameters should be considered before using the shear vane results on applications involving granular material componentsWe wish to acknowledge the contributions of Amanda Bolta and Nathan Lester through the US Department of Energy DOE Community College Institute CCI The CCI is a DOEfunded student research program for students from community colleges across the nation DOE funding provided to the laboratories covers the costs of student stipends housing allowances and travel reimbursement Pacific Northwest National Laboratory is operated for DOE by Battelle under Contract DEAC0576RL01830
Keywords: