Analysis of Asphalt Mix Test Results at Michigan Technological University

Conducting various tests on asphalt mixes at Michigan Technological University revealed differences in properties such as TSR values, compaction processes, and air void percentages. Mixes SPWED430I and SPWED440E exhibited challenges in achieving required air void percentages, while anti-stripping agents played a crucial role. Differences in performance between 500 and 3500 cycles in the MIST test were also observed.

• Asphalt Mix
• Test Results
• Michigan Technological University
• TSR Values
• Compaction Processes

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

2. 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

3. 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)

4. TSR Results TSR_500 TSR_3500 1.60 1.36 1.40 1.30 1.26 1.18 1.20 1.01 0.99 0.81 1.00 0.91 0.90 0.91 0.87 0.84 0.83 0.82 0.78 TSR 0.80 0.55 0.60 0.40 0.20 0.00 Mix Type

5. 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

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