Assessment on the performance of asphalt mixtures prepared with adhesion promoters
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Date
2019-06
Authors
Nge Jia Sheng
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Abstract
Asphalt pavement is typically susceptible to moisture damage and is less durable
compared to concrete pavement. However, the performance of the asphalt pavement
could be improved with the incorporation of additives or modifiers thru binder
modifications. The objective of the study is to assess the effect of adhesion promoters,
namely PBL and M5000 onto the Hot Mix Asphalt (HMA). The performance has been
assessed in terms of the service characteristics, the bonding properties and the
mechanical performances. The service characteristics were assessed using Workability
Index (WI) and Compaction Energy Index (CEI) to show the ease of asphalt mixture to
be mixed and compacted to the desired density. The bonding properties of the modified
asphalt mixtures were determined using the boiling water test and static test method to
indicate the degree of coating after undergoing specific conditioning time and
temperature. The mechanical performances of the modified asphalt mixture were
evaluated by Marshall stability, Leutner shear, semi-circular bending and Modified
Lottman tests. All specimens were prepared by incorporating adhesion promoters at the
dosage rates of 0.5% and 1.0% by weight of asphalt binder for both additives. From the
investigation, the bonding properties were significantly improved for the modified
asphalt mixture compared to the control mixture. The WI of the modified asphalt mixture
was increased and the CEI was decreased in comparison to the control specimen, which
means the workability of the modified asphalt mixture is higher and requires less energy
to be compacted. Modified asphalt mixture generally had better performance in most of
the mechanical performances except the Leutner shear test result. The control specimen
achieved a higher shear strength than the PBL at both dosages. While the M5000 at 0.5%
had higher shear strength than the M5000 at 1.0% dosage and the control specimen.
Therefore, the modified asphalt mixtures have better overall performance than the control
mix. Overall, the modified asphalt mixture is more moisture resistant and durable against
severe weather condition and traffic loadings.