The M.i.S.T.™ (Moisture Induced Stress Tester)
The Future of Moisture Sensitivity Testing
- Instrotek - The M.i.S.T.™
AASHTO TP 140, ASTM D7870 U.S. Patents #8,020,451 – #6,799,471 – #8,312,776
- A revolutionary, representative new way to condition HMA for moisture sensitivity
- Designed to simulate HMA pavement stripping mechanisms
- Conditions samples in hours, not days for same-day testing
The M.i.S.T. is the latest innovation from InstroTek and unlike current test methods, is designed to simulate the stripping mechanisms that occur in HMA pavement layers
M.i.S.T. (Moisture Induced Stress Tester) is designed as a totally new, quick and logical method for testing moisture damage susceptibility of asphalt mixtures.
For years, roadway engineers and asphalt contractors have been searching for a better method to test for “stripping” or “raveling,” which is the loss of bond or cohesion between aggregate and asphalt binder. Current test methods can take days to complete and are not conducive to a production quality control environment. Results 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 pore pressure and scouring created in the field by vehicle tires passing over wet pavement.
The InstroTek, Inc. M.i.S.T. is a cyclic conditioning system that is designed to simulate the stripping mechanisms that occur in HMA pavement layers. The M.i.S.T. is a stand alone unit that consists of a pressurized chamber that pushes and pulls water through a compacted asphalt sample, simulating the action of an automobile tire 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.
- 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 tires.
- Testing is automatic and monitored by sensors.
- Data can be stored and transferred to a PC for evaluation and archiving.
- Weight: 159kg / 350lbs
- Height: 1.35m / 53"
- Foot Print: 0.53 x 0.53m / 21 x 21"
- Power: 115 VAC 20A (optional 230 VAC 10A)
|Temperature Accuracy||±1 ˚C/±1.8˚F|
|Max Temperature||60 ˚C/140 ˚F|
|Sample Height||25 mm to 150 mm/1” to 6”|
|Sample Diameter||100 mm to 150 mm/4” to 6”|
|Pressure Accuracy||7 kPa/±1 psi|
|Pressure Control||7 kPa/±1 psi|
|Maximum Apparent Pressure||345kPa/50 psi|
|Electrical||115 VAC 20 A (Optional 230 VAC 10 A)|
|Weight||159 kg/350 lbs|
|Foot Print||0.53 m x 0.53 m/21”x21” square|
|Hydraulic Fluid ||Hydraulic oil with a viscosity of
150 to 300 SUS at 38˚C (100˚F)|