Moisture susceptibility of Nano-sized Hydrated Lime-modified foamed Warm Mix Asphalt mixes

Document Type

Conference Proceeding

Publication Date

1-1-2014

Abstract

Despite the obvious benefits of Warm Mix Asphalt (WMA) technologies are stealing the spotlight from classic Hot Mix Asphalt (HMA), there are concerns regarding moisture susceptibility of the mixes especially when it comes to the technologies that mainly depend on applying water (i.e., foaming). The primary objective of the research was to investigate the moisture susceptibility of foamed WMA mixes modified with Nanosized Hydrated Lime (NHL). Hydrated lime materials in this study included, NHL with particle sizes of 50-nm and 100-nm along with Regular-sized Hydrated Lime (RHL). The Tensile Strength Ratio (TSR) and dynamic modulus (|E*|) tests were employed to accomplish this objective. A secondary objective of this research was to assess the validity of the two utilized TSR and |E*| tests. The |E*| samples passed one and five freeze- Thaw cycling processes before each testing. The TSR and |E*| results revealed that foamed WMA mixes are more susceptible to moisture damage in comparison to the control mix. Also, the NHLmodified mixes performed much better than the RHL for both unconditioned and after multiple conditioning. The |E*| test seems more reasonable than the TSR test for moisture susceptibility testing. © 2014 Taylor & Francis Group, London.

Publication Title

Asphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014

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