Abstract
AbstractWhile almost all asphalt paving contractors in Vietnam are using virgin, non-renewable materials (i.e., aggregates and bitumen) to produce conventional hot mix asphalt (HMA), most contractors in the United States, Europe and Japan are producing warm mix asphalt (WMA) with reclaimed asphalt pavement (RAP). WMA can be produced and paved at lower temperatures, reducing energy consumption and emissions released during production and paving of asphalt mixtures. Use of RAP can reduce the demand for non-renewable resources. When RAP is used in WMA, their environmental benefits can be combined, making the produced mixture more sustainable. This study presents a life-cycle assessment (LCA) to compare the environmental benefits of WMA with RAP to those of the conventional HMA currently produced by most of the asphalt producers in Vietnam. The WMA mixtures with 20–50% RAP were designed to have performance similar to the conventional HMA in the LCA. Based on this LCA analysis, it was determined that WMA with the addition of from 20 to 50% RAP provides a reduction of 16.6–27.0% global warming (CO2-eq) and 17.8–28.7% energy consumption impact of HMA when it is designed to have the same performance as the conventional HMA.KeywordsHot mix asphaltWarm mix asphalt with RAPReclaimed Asphalt PavementGreenhouse gas emissionsEnergy consumptionLCA
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