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Dynamic Modulus and Flow Number Tests conducted with the Asphalt Mixer PerformanceTester
Instrument Detail
Make : IPC Global, Australia
Model : AASHTO:TP 79-2009
Working Principles, Specification and Applications
NCHRP Project 9-29 developed commercial equipment which recommended three simple performance tests:
- 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.
User Instructions
- Prepare sample
- Fix the LVDTs
- Condition the chamber with respect to testing temperature
- Operate the system
Contact Details
Director
CSIR-CENTRAL ROAD RESEARCH INSTITUTE
Delhi-Mathura Road
P.O: CRRI, New Delhi-110025
Tel.:+91-11-26848917, Fax:+91-11-26845943
Email Id: director.crri@nic.in
Instrument Usage Charges (Including GST)
- Industry: Rs. 1.5 Lakh (One Lakh Fifty Thousand)
- University: Rs. 1.125 Lakh (One Lakh Twelve Thousand Five Hundred)
- National Labs/R&Ds: Rs. 1.125 Lakh (One Lakh Twelve Thousand Five Hundred)