This paper presents test results on warm mix asphalt (WMA) mixtures containing high amounts of reclaimed asphalt pavement (RAP) to evaluate performance when used as a surface mixture. The evaluation considered permanent deformation, durability, non-load associated cracking, and moisture damage. Crushed gravel and limestone mixtures were tested with 0 to 50% RAP in conjunction with three warm mix asphalts. Test results indicated high RAP-WMA to be a potentially viable product for surface mixtures. WMA P A R h g i h h t i w s e r u t x i m t n a t s i s e r t u r g n i c u d o r p f o e l b a p a c n w o h s s a wc ontents. A more intriguing finding was that while increasing rut resistance the high RAP mixtures did not affect the low temperature properties as much as the high temperature properties. Mixtures with high RAP content appear to be only slightly more susceptible to thermal cracking. Warm mixes have been shown to be susceptible to water. In general it was shown that WMA technology can be used with high RAP content to produce mixtures that are more resistant to moisture damage. Increasing the RAP content generally increased the resistance of the mix to moisture damage. Gravel mixtures produced with foamed asphalt, however, did not perform well with respect to moisture damage, especially with no RAP in the mixture. Testing indicated high RAP content WMA mixes may be more susceptible to durability issues than low RAP mixes. To date this has not been observed in the field, but additional monitoring of high RAP sections is needed to determine if and to what extent durability on the surface is a cause of concern.
Keywords: Warm Mix Asphalt, WMA, Reclaimed Asphalt Pavement, RAP, Moisture Damage, Performance, Rutting, Durability, Cracking ________________________________ 1PhD Candidate, Mississippi State University, Starkville, MS 2Research Civil Engineer, Engineer Research and Development Center, Vicksburg, MS 3Assistant Professor, Mississippi State University, Starkville, MS The oral presentation was made by Mr. Doyle.
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