Asphalt

Asphalt AMPT

Asphalt Mixture Performance Tester 

• The AMPT is laboratory based equipment. It is used to conduct Dynamic Modulus and Flow number on road cores and laboratory compacted specimen (100x150mm). The laboratory specimen is gyratory compacted, cored and trimmed to the required dimensions.
• Test method –  AASHTO TP79
• The procedure provides indication of the dynamic modulus and the flow number of the HMA.
• The  dynamic modulus is a performance-related property and is used for evaluation and characterizing the stiffness of Hot Mix Asphalt
• Flow number gives indication of resistance to permanent deformation of the HMA

Asphalt Permanent Deformation

Hamburg Wheel Tracking Tester (HWTT)

• The Hamburg wheel tracking tester is used to perform tests on the laboratory compacted specimen or road cores and is a laboratory fixed device.
• Adopted standard test protocol – AASHTO T324
• This procedure provides information about the rate of permanent deformation and rut depth from a moving load (steel wheel) and the premature failure susceptibility of the asphalt mix due to weakness in the aggregate structure, inadequate binder stiffness, or moisture damage.

Model Mobile Load Simulator (MMLS)

• The MMLS can be used to perform tests on the laboratory compacted specimen, road cores or slabs.
• Adopted standard test protocol – DPG1
• MMLS testing is an accelerated pavement testing tool that allows the application of realistic wheel contact stresses for evaluation of pavement structures and road paving materials. The test can be conducted under both dry and wet conditions at predetermined temperature and loading conditions.