Zhanping You Michigan Technological University May 24, 2018

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Presentation transcript:

Zhanping You Michigan Technological University May 24, 2018 MTU MIST Results Zhanping You Michigan Technological University May 24, 2018

Test Procedures Compaction Process Pre-heat samples at a temperature of 5 °C lower than the compaction temperature for 2 hours Quarter the samples Place the samples in the oven for 1 hour to reach the compaction temperature Molds are in the other oven at a temperature of 5 °C higher than the compaction temperature Compact sample to design height, 63.5mm

Test Procedures Gmb tests (AASHTO T166) MIST tests (ASTM D7870, at 55 °C, 40 psi) 3 samples under 500 cycles 3 samples under 3500 cycles IDT tests (AASHTO T283)

TSR Results

TSR Results TSR values of most of the mixes over 0.80 Mix SPWEB340C has a low TSR value of 0.55 Mix SPWEB440E may be moisture susceptible Mix SPWED430I and mix SPWED440E have high TSR values of greater than 1

Discussion Mixs SPWED430I and SPWED440E Difficult to obtain required air voids percent Anti-stripping agent MIST difference between 500 cycles and 3500 cycles