QC/QA Testing Differences Between Hot Mix Asphalt (HMA) and Warm Mix Asphalt (WMA). Annual Report for FFY 2011.

摘要

The following report summarizes the work accomplished to date on a three-year (a 1-year extension to include laboratory compacted foam WMA was approved for FY 2012) study on QC/QA differences between warm mix asphalt (WMA) and conventional hot-mix asphalt (HMA). WMA represents a group of technologies which allow a reduction in the temperatures at which asphalt mixtures are produced and placed on the road. These technologies tend to reduce the viscosity of the asphalt cement allowing coating at lower temperatures. Reductions of 35 to 100 degrees F have been reported. Such drastic reductions have the obvious benefits of cutting fuel consumption and decreasing the production of greenhouse gases. In addition, potential engineering benefits include better compaction on the road, the ability to haul paving mix for longer distances, increased RAP percentages, and the ability to pave at lower temperatures.