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- W53605784 abstract "A laboratory study was undertaken to investigate the feasibility of using high (25% or more) reclaimed asphalt pavement (RAP) content warm mix asphalt (WMA) mixtures to construct the surface of highways managed by the Mississippi Department of Transportation (MDOT). The focus of the research was high RAP, with secondary emphasis on warm mix technologies used in conjunction with RAP. Three RAP sources and two warm mix technologies (Sasobit® and Evotherm 3G™) were tested. The study used all asphalt mix designs performed in the past several years by MDOT alongside field produced surface mixes as the reference for comparison/investigation of high RAP-WMA properties. The investigation included durability, cracking, rutting, and moisture damage testing as its primary components. The study developed regression equations to estimate the amount of absorbed asphalt present in a given RAP source using the MDOT mix design database. It was shown that traditional methods of determining asphalt absorption of RAP are questionable in many situations. Durability was measured on the dense graded mixtures by the Cantabaro test, which is not a typical use of the test. Results did not indicate significant durability problems of the high RAP-WMA mixes, though they were shown to be less durable in some conditions. Mixture stiffness measured by the Bending Beam Rheometer (BBR) was used as a comparer to control mixes to evaluate crack resistance and produced varying results with test temperature, though no major problems were identified with the high RAP-WMA. Rutting was shown to be on par with PG 76-22 control mixes in some instances. Moisture damage was found to be a potential problem using loaded wheel testing under water. Overall, the study concluded that 25% RAP WMA was feasible and that 50% RAP WMA may be feasible for use in surface layers." @default.
- W53605784 created "2016-06-24" @default.
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- W53605784 date "2010-12-31" @default.
- W53605784 modified "2023-09-27" @default.
- W53605784 title "Laboratory Investigation of High RAP Content Pavement Surface Layers" @default.
- W53605784 hasPublicationYear "2010" @default.
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