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

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

Evaluation of moisture characteristics of warm mix asphalt involving natural zeolite

In last decades, warm mix asphalt (WMA) has become a significant alternative paving technology to hot mix asphalt (HMA), due to the relatively low temperatures required to heat asphalt during production and placement, minimising environmental damage while maintaining the advantages of HMA. However, low production and placement temperatures may result moisture-induced damage of asphalts. The objective of this study was to evaluate the moisture susceptibility characteristics of asphalts containing natural zeolite and its comparison with synthetic zeolite, organic, and chemical WMA additives. The stripping properties and moisture susceptibility characteristics of the specimens have been evaluated by means of the Nicholson stripping test and modified Lottman test, respectively