Cradle-to-gate life cycle assessment of recycling and impact of reduced production temperature for the asphalt sector in Belgium
Faculty of Applied Economics
Faculty of Applied Engineering Sciences
Davis, Calif. :University of California, 2014
Engineering sciences. Technology
Papers from the International Symposium on Pavement Life Cycle Assessment 2014, Davis, California, 14-16 October, 2014 / Harvey, John [edit.]; et al.
University of Antwerp
Bituminous mixture is the premier material for road construction in Belgium. Innovative technologies with regard to improve energy and material efficiency of pavement construction are necessary. Warm mix asphalt (WMA) may provide significant energy savings to the asphalt industry. Also, the use of reclaimed asphalt pavement (RAP) into new bituminous mixtures may diminish the extraction and processing of minerals and binders. Using life cycle assessment, the environmental impact of the production of WMA is compared with hot mix asphalt (HMA) containing reclaimed asphalt pavement and with conventional hot mix asphalt as a reference. Contribution analyses were performed in order to determine which processes are significant for the results and sensitivity analyses were conducted in order to take into account the influence of the most important assumptions in the process on the results. It was found from the results in the current study that a greater reduction of the environmental impact is obtained by using RAP in asphalt mixtures compared to reducing the mixture temperature. It was seen from the contribution analyses that mainly the production of bitumen, the transport of raw materials from the quarry or production site to the asphalt plant and the energy in order to generate heat, contribute to the total environmental impact. The results of the sensitivity analyses show that the total environmental impact of the asphalt mixtures varies mostly on the choice of the data source and the transport method.