Modeling of Asphalt Aging Based on Short-Term Aging Temperature and Time of Normal Asphalt Mixture for Quantifying Binder Aging

Abstract The binder in hot-mix asphalt (HMA) is aged (oxidized) a short-time period during haul-and-queue the field. Since oxidative aging of complex chemical process, it difficult to define as function limited variables. When comparing same types mixes, however, mix temperature ( T ) and time t kept at will be primary source variation affecting levels mix. level not easy estimate without measuring physical property, this study concentrated on developing an quantity (AQ) model for estimating based . loose mixes were artificially short-term various Ts different t; 130, 160, 180 °C 1, 2, 4, 8 h. absolute viscosity (AV) values, which represent recovered after each (SA) normal dense-graded mix, used regression with AQ values computed by model. best-fit was selected trial-and-error iterations between measured AV AQ. then (EAV) asphalts mixes. It found that useful SA-treated EAV showed excellent correlation R 2 > 0.99. Therefore, possible conclude could predict short-term-aged if materials sources limited.