Validation of Guidelines for Evaluating the Moisture Susceptibility of WMA Technologies (2016) / Chapter Skim
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12 Laboratory Experiment and Results The modified Lottman protocol per AASHTO T 283 was used in NCHRP Project 9-49 to evaluate moisture susceptibility of WMA. In order to assess alternative moisture conditioning protocols and to investigate various specimen-drying methods prior to laboratory testing, the laboratory experiment presented in Figure 13 was completed.
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13 Moisture Conditioning Protocols Dry Control Modified Lottman Moisture Induced Stress Tester Hot Water Bath Saturated-Surface Dry (SSD) MR Test IDT Strength Test APA Test SpecimenDrying Methods Modified Lottman SSD Air Dry CoreDry Oven Dry MR Test IDT Strength Test Dry Figure 13.
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14 using the modified Lottman protocol, the 1,000-cycle MIST, and the three-day HWB, while a significantly lower mixture stiffness value was observed for the 2,000-cycle MIST. A statistical analysis including analysis of variance (ANOVA)
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15 protocol, followed by the 2,000-cycle and 1,000-cycle MIST protocols, and then the three-day HWB protocol. Based on these results, the 1,000-cycle MIST protocol at 140°F (60°C)
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16 strength, while slightly higher and lower strength values were observed for the CoreDry and 24-hour oven dry specimens, respectively. The difference between the SSD and air dry specimens in wet IDT strength was significantly reduced as compared to the difference in MR stiffness (Figure 17)
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