Abstract:
This study used a Hamburg wheel-tracking device in hot-mix asphalt–warm-mix asphalt (HMA-WMA) with different WMA agents to analyze the rutting behavior of asphalt concrete. Five mixtures were collected in New Mexico with the same mixture design. Mixtures differed only in the additive technology. Foaming, chemical, and organic agents were compared with a WMA mixture with modified polymer and a HMA control mixture. Application of the Weibull failure rate function to predict rutting for different WMA agents was developed. Good rutting results were observed when the organic agent was tested compared with other WMA agents. The use of a polymer-modified binder in the WMA mixture with the organic agent significantly decreased rutting. HMA and WMA with foaming had similar rutting behavior, and the mixture with the chemical agent experienced a different performance from that of previous mixtures. Fitted Weibull failure rate function showed good correlation to HMA-WMA mixtures when rutting depths were low, and no hint of stripping phase was observed.
