Building Asphalt Pavement with SBS-based Compound Added Using a Dry Process in Greenland

TL;DRAbstract

This paper describes how polymer modified-asphalt (PMA) is normally produced using a “wet” process where the polymer is added to asphalt in a high shear mixer and delivered in a tank. However, it is time consuming and costly for asphalt mix producers to switch tanks between the straight asphalt and PMA for different projects, particularly for a small project in a remote location where a limited amount of PMA is needed. Therefore, the pelletized styrene-butadiene-styrene (SBS)-based compound was developed, which can be added directly into the pugmill mixer using a “dry” process along with asphalt and aggregates. The SBS-based compound differs from a typical PMA where it is formulated to melt and blend with asphalt quickly during a batch mixing process. Asphalt pavement was constructed using asphalt mixtures with SBS-based compound added by a “dry” process at the batch plant. Based on the initial set of strain data collected under the slow-moving loader right after construction, the high

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