| dc.description.abstract | Asphalt mix production has been limited to conserve resources and reduce pollution. Hot mix
asphalt (HMA) technologies consume a significant amount of energy during asphalt mix
production. However, warm-mix asphalt (WMA) might decrease the conserved energy by
lowering the mixing and compaction temperature. There has long been a lot of interest in the
incorporation of waxes as the rheological enhancer in binders of asphalt. Sasobit (S) and
Polyethylene (PE) waxes reduce viscosity-temperature and improve workability. In this study,
S and PE from a Taiwan company were used with varying percentages of 1% - 5% by mass of
binder. While mechanical blending at two different speeds: 1000 rpm and 2000 rpm was utilized
to see the effect of the blending method based on the binder′s rheological characteristics. In
order to identify the optimal percentage of wax additives for warm mix binders, rheological and
chemical tests were carried out. The test includes the following parameters: penetration,
ductility, softening point, viscosity, dynamic-shear rheometer (DSR), rutting, fatigue, and thinlayer
chromatography/flame
ionization
detection
(TLC-FID)
for
chemical
detection.
According
to
rheological testing, adding more wax additives could improve the stiffness of the binder
while lowering its viscosity at high temperatures. Mixing at 2000 rpm having a greater decrease
compared to 1000 rpm which has a significant benefit in lowering production and mixing
temperatures. Based on all the rheological performance in study research, the performance of
PE-G is comparable to S. The use of 3% wax additives is the ideal amount to utilize in Taiwan′s
warm mix binder. It is able to fulfill Taiwan′s construction criteria for pavements in hot
temperatures (PG70). However, it is recommended to conduct asphalt concrete samples using
several wax additives for better performance interpretation. | en_US |