Shear Box is used for direct shear testing of soil specimens to determine the shear strength of a soil sample. These devices fit Karol-Warner Direct / Residual Shear Machines and meet requirements of ASTM D3080 and AASHTO T 236 for testing the shear strength of soils. They are available in a variety of sizes to test circular or square specimens. Included with each unit are top and bottom Porous Stones and a stainless steel Loading Ball.
The units are divided horizontally, allowing application of a vertical confining load to the specimen and horizontal shearing stresses to the lower half of the box. The upper half remains stationary. The Shear Box Counterbalance (purchased separately) offsets the weight of the top half of round or square boxes with specimen dimensions 2.5in (63.5mm) or smaller. Inquire about larger sizes. Once you have the test results and shear failure has been recorded, the force direction can be reversed to determine residual shear values.