Patent ID: 9383346
Filing Date: 2016-07-05
CPC Classification: G01N

Claim Text:
1. An expandable jacket and its calibration device: The expandable jacket comprising; a. a rubber membrane containing a soil specimen, b. radially mounted outside the membrane, vertically segmented and axially mounted stainless steel plates, these plates are supported radially by two stainless steel brackets mounted together with bolts, one set of brackets is mounted near the top and one near the bottom of the jacket, the segmented plates and the brackets are attached to each other by screws that penetrate from outside the jacket through the brackets and into the plates, c. these plates further have elastomeric rubber rings or bands horizontally mounted around the plates, d. these plates also have nylon or leather straps horizontally mounted with screws around the plates, e. the bottom of the expandable jacket comprising a bottom platen with a porous disc placed on top of the platen and with the soil specimen resting on the disc, f. the top of the expandable jacket comprising a top platen with a porous disc placed underneath of the bottom of the platen and with the soil specimen underneath the disc, g. when the expandable jacket is placed around a soil specimen, the specimen can undergo a uniform radial expansion without bulging as it undergoes a vertical load applied on the specimen during a triaxial compression test with the specimen maintaining its uniform cylindrical shape.