01594557

Component

https://doi.org/10.3141/2523-01

The global desire to move toward sustainable transportation systems encouraged road authorities to adopt warm-mix asphalt technologies and to increase the amount of reclaimed asphalt pavement (RAP) in asphalt mixtures. The reduction of mixing and compaction temperatures through the adoption of specific additives has exhibited several downsides, including low resistance to high temperatures (rutting), incomplete drying of the aggregates, moisture damage, and low durability. However, high RAP percentages provided aging of the asphalt binder, variability in the aggregate gradation and asphalt binder content, and some limitations during plant production. The authors conducted a comprehensive laboratory investigation on several warm-asphalt mixes, including those with high RAP percentages, to evaluate volumetric, mechanical, and long-term performance. A new compound of a polymer-modified and fiber-reinforced system was added to provide comparable performance with respect to polymer-modified hot mixes. The laboratory study evaluated the influence of mixing and compaction temperatures, compaction properties, dynamic modulus and master curves, fatigue behavior, and rutting resistance, among other things. Results showed that warm-mix technologies could be adopted together with high RAP percentages and provide consistent performance in durability similar to that attributed to polymer-modified hot mixes. Recycling materials and lowering emissions while providing long-term performance can therefore be considered a tangible objective; however, a correct mix design was demonstrated to be fundamental.

01594347

15-4872

English

pp 3-10

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369442

Print

Figures; Photos; References; Tables

Asphalt mixtures; Fiber reinforced materials; Mix design; Pavement performance; Polymer asphalt; Reclaimed asphalt pavements; Sustainable development; Warm mix paving mixtures

Design; Highways; Pavements

TRIS, TRB, ATRI

Mar 25 2016 10:51AM

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