Addition of facility in Road Asset Management Group of CRRI for conducting Dynamic Modulus, Flow Number and Flow Time Tests (NCHRP Project 9-29)

Outputs:

• Dynamic Modulus – Absolute value of Complex Modulus (dividing peak to peak stress by peak to peak strain subjected to sinusoidal loading)
• Flow Number – Number of repeated load cycles (repeated compressive stress pulses) corresponding to the minimum accumulation rate of change of permanent axial strain

                        - Related to rutting resistance of HMA

                        - Flow number increases rutting resistance also increases

• Flow Time – In this a constant rather than repeated load is applied to the sample and total deformation is observed, therefore, it is simply static creep test. It is the time corresponding to the minimum rate of change of permanent axial strain

Components of Equipment

It comprises a triaxial cell , Environmental chamber , Hydraulic actuator and pump, Refrigeration and heating unit with heat exchanger , Control and data acquisition system, Quiet built-in hydraulic pump provides pressure for the vertical loading system, Compressed air is used for confining pressure and to raise and lower the triaxial cell.