M.i.S.T. Moisture Induced Stress Tester -
from Instrotek Inc.

A totally new, quick and rational method for testing moisture damage susceptibility of asphalt mixtures. It is designed to simulate the stripping mechanisms that occur in HMA pavement layers.

For years, roadway engineers and asphalt contractors have been searching for a better method to test for the loss of bond or cohesion between the aggregate and the asphalt binder commonly know as "stripping" or "raveling".

Current test methods can take days to complete and are not conducive to a production quality control environment.

Results can also vary widely due to the lack of controls over the degree of saturation and temperature. More importantly, current test methods do not replicate the dynamics of pressures and scouring encountered in the field with repeated pore pressure created by vehicle tyres passing over a wet pavement.



Advantages

Designed to simulate HMA pavement stripping mechanisms

Shorter test times than current moisture sensitivity tests

Results in less than one day

Tests can be performed at realistic pressures similar to pressures produced by vehicle tyres

Testing is automatic and monitored by sensors

Data can be stored and transferred to a PC for evaluation and archiving

 

Fast, Accurate, Innovative

The M.i.S.T. is a standalone unit that consists of a pressurized chamber that pushes and pulls water through a compacted asphalt sample, simulating the action of an automobile tyre on the road.

The tests can be performed at different pressures and temperatures to replicate different traffic and environmental conditions. The unit is completely automatic and results are ready in as little as four hours.

Simply place your asphalt core sample in the M.i.S.T. testing chamber, select your test parameters, press start and the unit does the rest. Upon completion of the test, the asphalt core is taken out of the testing chamber and evaluated for susceptibility to moisture damage.



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