With concerns about the economy abounding and unpredictable oil prices constantlyfluctuating, there have been efforts to save money on asphalt by taking harder asphalts such as recycledasphalt pavement (RAP) and softening them with rejuvenating agents. In addition to saving money, usingrenewable or recycled materials rather than crude oil-derived materials to soften the asphalt could bebeneficial to the environment. The environmentally-friendly industrial materials used in this study were asoybean wax and recycled cooking oil. The results of these two materials were compared with acommercially used rejuvenating agent which is derived from crude oil. All three of these materialssoftened an air-blown PG 70-28 base asphalt and improved its low-temperature properties. When testedwith the bending beam rheometer (BBR) according to the AASHTO M320 specification, the recycledcooking oil was found to be the most promising, followed by the rejuvenating agent and the soybean wax.
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