The Dead-Weight Direct/Residual Shear Machine by Karol-Warner is a motorized dead-weight testing machine for direct and residual shear testing of undisturbed and remolded soil samples. A solid 1-1/4in (32mm) base for the Shear Box assembly is mounted on a sturdy steel cabinet, with heavyduty casters for easy mobility. This compact, self-contained unit is built for harsh laboratory environments and requires little floor space.
The Dead-Weight Direct/Residual Shear Machine uses a 10:1 beam loading device to control confining pressures. A load cell with digital readout displays shear force and analog dial indicators measures vertical and shear displacement. A stepper motor drive controls the strain rate within 1%, and is easily adjustable using digital thumb wheel controls. The strain rate can be set from 0.0001—0.3in/min (0.0025—7.62mm/min). Maximum shear displacement is 0.8in (20.3mm). Travel is set with limit switches. Vertical load capacity is 1,411lb (640kg) and maximum horizontal shear force is 1,500lbf (6,672N). Optional digital horizontal and vertical displacement transducers are available to provide output to a PC, and must be connected to the Two-Channel, or Four-Channel Digital Readout, also purchased separately. The Four Channell Digital Read-out Box provides a channel to direct force measurements to a PC. The Horizontal Displacement Transducer has 0.6in (15.2mm) range with 0.0001in (0.0025mm) resolution, and the Vertical Displacement Transducer has 1in (25.4mm) range and 0.0001in (0.0025mm) resolution.
The basic system includes Direct/Residual Shear Ring (2.5" Dia x 1), 2.5in (63.5mm) diameter stainless steel shear ring, porous stones, drainage plates, loading block, and a water chamber constructed of Teflon coated anodized aluminum for corrosion resistance. Cutting rings and extrusion tools are also available as accessories. Selection of one weight set is required. Choose from US or Metric weight sets. Additional individual weights are available upon request.
Overall Dimensions: 36x14.5x54in (914x368x137mm), WxDxH.
Electrical: 115V/60Hz
Meets Test Methods:
AASHTO T236
ASTM D 3080