Enhanced Moisture Sensitivity Study
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2019-09-01
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Edition:October 2017 – September 2019
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Abstract:The moisture damage susceptibility of four different asphalt concrete mixes from Wisconsin, two with dolomite aggregates and two with siliceous aggregate, was evaluated through laboratory and conditioning testing. One mix was considered a good performing mix and the other three with poor or marginal performance with respect to moisture damage resistance. Moisture conditioning followed existing standards and included freeze/thaw, suction/pressure through Moisture-induced Stress Tester (MiST), and simultaneous effect of water and loading using Hamburg Wheel Tracking Device. Wheel tracking was also conducted on specimens after conditioning with MiST as well as specimens maintained dry without water conditioning. The tests to measure mix properties followed existing standards or provisional standard protocols and included indirect tensile strength test, indirect tensile modulus test, Hamburg wheel tracking test, and ultrasonic pulse velocity test. Based on the results, the laboratory performance of the mixes was ranked with respect to moisture damage susceptibility, and a set of recommendations for establishing pass/fail criteria was developed and presented. MiST conditioning is recommended in case the intention is to evaluate the effect of moisture conditioning on engineering properties of the asphalt mix and when the changes in dynamic modulus of the asphalt mix is intended. Investigating the change in asphalt concrete modulus as a result of moisture damage is of interest as it is one of the major input parameters to the most recently developed performance prediction models. Recommendation is made to use Hamburg wheel tracking for at least medium to high traffic volume roads and continue using AASHOT T 283 for lower volume roads. Recommendation is also made to include criterion on minimum required wet strength in cases where AASHOT T 283 is utilized. This criterion is in addition to the existing criterion on minimum indirect tensile strength ratio (TSR) of the mix.
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