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Direct Shear Apparatus, IS: 2720 (P-xiii), IS: 11229
ASTM D 3080, BS 1377
The Direct Shear test is carried out with an apparatus consisting of a square divide into two halves . The specimen contained in the box , is subjected to a constsnt normal load
while an increasing horizontal force is applied to one of the
sections of the shear box. The force causes a shear failure along the junction between the box sections. He shear force and the normal load are measured directly. The rate of strain is adjusted by the speed of horizontal force applied. The loading unit has V strips on which the shear box housing rests. The precalibrated load yoke helps counter balance the loading system . the load yoke with direct and trough level system for applying normal load upto 8 kg/cm2 capacity, fixtures for proving ring , brackets for holding consolidation and strain dial gauges are provided . The lead screw coonected to the shear box housing helps application of shear stress.
12 rates of strains 1.25 to 0.0002 mm/min. Consists of: Shear box assembly. Halves of shear box-set of two, Plain gripper plates-pair, Perforated gripper plates-pair, Porous stone-pair, Top Loading pad, Base plate, Shear box housing with two ball roller strips, specimen cutter, weight to give normal stress of 3 kg/cm.sq. Comprises of: 0.05 kg/cm2. 4 , 0.10 kg/cm2.-1, 0- 20 kg/cm2.-1, 0.50 kg/cm2.-3, kg/cm2- 1 . Specimen size 60 x 60 x 25 mm. Electrically. 220V, 1 Ph, 50 cycles, AC supply
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