Page 75 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

CALCULATIONS,PLOTTING ANDQUESTIONS:

i. Draw and plot a graph of force after calibration (Load) against penetration of
ii. plunger. Calculate the CBR value for the penetration 2.5mm and 5.0mm.

For TOP data
CBR2.5 = ForceforPenetration2.5mm x 100
13.24 KN (standard force)

CBR5.0 = ForceforPenetration5.0mm x 100
19.96 KN (standard force)
For BOTTOM data
CBR2.5 = ForceforPenetration2.5mm x 100
13.24 KN (standard force)
CBR5.0 = ForceforPenetration5.0mm x100
19.96 KN (standard force)

Example of force after calibration (Load) against penetration of plunger graph

Load (kN) Force for Penetration 2.5 mm
Top

Bottom

Penetration of plunger (mm)
2.5

Higway Engineering Laboratory page 62