Experimentaltudy to design warm mix asphalts andecycledwarm mix asphalts using natural zeolite as additiveorustainable pavements

Abstract

There are currently various technologiesor the manufacturef warm mix asphalts (WMA). This paper presents the possibilityf using a natural zeolite to manufacture WMA as an alternative toxistingynthetic productsor the manufacturef this typef mixture. Moreover, the possibilityf manufacturing WMA with the additionfecycled asphalt pavement (RAP) using natural zeolite as the basisf a warm mix technology wasvaluated. Firstly, asphalt mixtures were manufactured at three different temperatures (145 °C, 135 °C, and 125 °C) with different percentagesf natural zeolite to determine the temperature and theptimum contentor the manufacturef WMA. Then, the zeolite moisture content and itseleasever time were determined at different temperatures, and its distribution in the binder was checked at different concentrations bycanninglectron microscopy andluorescence. Next, with theptimum zeolite content, the additionfAP between 10-30% in the WMA at theame three manufacturing temperatures wasvaluated. Two typesf compaction were used: the impact and gyratory compactions. The Marshall parameters werevaluatedor all the designed mixtures. Theesults indicated that the manufacturef WMA with the additionf natural zeolite iseasible, and dependingn theequired mixing temperature,ecycled WMA with different percentagesfAP can bebtained.