EFFECT OF WARM ASPHALT ADDITIVE ON PAVEMENT PERFORMANCE

الملخص

Warm mix asphalt (WMA) is mixed at temperatures ranging 20 – 50 °C lower than those in which is called hot mix asphalt (HMA). The use of synthetic zeolites as a warm mix asphalt additive has exhibited many additional advantages, such as reduced susceptibility to permanent deformation. However, there are also indications that the use of synthetic zeolites as a warm mix asphalt additive for some percentages increases the moisture sensitivity of pavements except for 5% there is a slight improvement. The results of the study indicated that the selected percentages of synthetic zeolite to the warm asphalt differently affected the mixture properties. When the mixture properties were compared, it was observed that WMA with 3% of synthetic zeolite reduced the indirect tensile strength value, also the WMA mixture with 5 % of synthetic zeolite decreased the rut depth of the mixtures and slightly increased in the tensile strength ratio (TSR).