DETERMINATION OF MODULUS OF SUBGRADE REACTION (K-VALUE) OF SOILS IN FIELD

This method for the determination of modulus of subgrade reaction of the soil in place (generally known as K-value of the subgrade ), for evaluation of strength of subgrade for roads, runway pavements and raft foundations. The set up consist of Bearing plates of 75cm dia, 60cm dia, 45cm dia and 30cm dia X 25mm thick (1 No.each size), Loading attachment with ball and socket joint, Hydraulic or Screw Jack of 150 KN Capacity, Calibrated Proving ring of 150 KN with dial gauge, Digital Dial gauge of 0.001mm x 12.7mm travel (3 Nos.),Datum bar of 5 meter length, Jack pads. Supplied without reaction beam. On site arrangement for Reaction Beam or Truss or Truck or Trailer (as per the requirement of test) will be arranged by the user/customer. As per IS:9214-1979

Specifications of the machine:

• Capacity - 150 kN
• Least count - 7.5 kN
• Accuracy - 1%
• Piston stroke - 100 mm
• The machine will be supplied with polyhydron make hand pump
• The machine will be supplied with Hose pipe 5 meter long
• The machine will be supplied with hydraulic oil 68 no - 10-12 liters to conduct the test
• The machine will be supplied with following round plates 1 no each
• 75cm dia, X 25mm thick 
• 60cm dia, X 25mm thick
• 45cm dia X 25mm thick
• 30cm dia X 25mm thick
• The machine will be supplied with proving ring of 150 kN with calibration certificate
• The machine will be supplied with dial gauge of 12.7 mm with least count of 0.001 mm with calibration certificate (3 no)