Abstract
The aim of this paper is to evaluate a new practice for determining resistance of asphalt mixtures to moisture damage. The conditioning involves application of vacuum to fully saturate the mixtures followed by application of cyclic load to create damage using the internal pore pressure. The test specimens are either 150-mm Semicircular Bend (SCB) or 100-mm indirect tensile (IDT) specimens. The mechanical performance test referred to it as Incremental Repeated Load Permanent Deformation Test (iRLPD) is a damaged based test, as opposed to modulus- or strength-based tests. The level of the load in iRLPD test is high enough to cause micro-damages yet low enough not to fail the specimens. Since iRLPD test is not destructive, the test is conducted on the same set of specimens before and after conditioning, hence the sample to sample variability is eliminated. The parameter of the test is the Minimum Strain Rate (MSR) ratio, which is the ratio of the MSR after conditioning to the MSR before conditioning. For moisture resistant mixtures MSR ratio is close to 1 and for the moisture susceptible mixtures the MSR ratio is greater than 1. The results of the study have shown that the combination of vacuum saturation and load conditioning proposed in this study is very effective in creating moisture damage similar to the damage caused by the passing of a heavy tire over a saturated pavement. It is also demonstrated that the iRLPD test is very sensitive to the damage due to moisture.
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References
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Azari, H., Mohseni, A. (2013). Improvement of the Test Method for Determining Moisture Damage Resistance. In: Kringos, N., Birgisson, B., Frost, D., Wang, L. (eds) Multi-Scale Modeling and Characterization of Infrastructure Materials. RILEM Bookseries, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6878-9_9
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DOI: https://doi.org/10.1007/978-94-007-6878-9_9
Publisher Name: Springer, Dordrecht
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