There are a variety of publically available resources and tools online that can be used to measure greenhouse gas reductions associated with the use of warm mix asphalt concrete (WMAC) and reclaimed asphalt pavement (RAP). The following bullets provide a list of the available resources on this topic and a brief description of the way in which they might be used.
o Environmental Product Declarations (EPDs): EPDs are standardized ways of reporting the life-cycle environmental impacts of products. The National Asphalt Pavement Association has started an EPD program, but as of this writing the program has not released any publically available results. EPDs are the most accurate way to report GHG reductions associated with different asphalt mix designs and are becoming the primary means of reporting reductions. Until EPD reporting becomes common for asphalt mixes the following resources and tools are available.
o EPA’s Analysis of Recycling of Asphalt Shingles in Pavement Mixes from a Life Cycle Perspective: This report provides a detailed analysis of GHG reductions from WMAC, RAP and RAS. The analysis considers a number of different mix designs and calculates the carbon intensity for each (lbs. CO2e / short ton). A summary of these findings are shown in the figures on the Strategy Introduction page.