Modified Bromhead Ring Shear Apparatus

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Courtesy of ASTM International

A modified Bromhead ring shear apparatus is described, which incorporates vanes on the loading surfaces to improve torque transfer to the specimen. The specimen thickness is increased to accommodate the vanes. A method of specimen preparation is described that ensures a flat shear surface in the center of the specimen. Results are given for the residual failure envelope of Lias clay using the modified apparatus.

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