Ahmad Hafizullah

Posted By Ahmad Hafizullah on February 19, 2011

Life Cycle Assessment On Using Recycled Materials For Rehabilitating Asphalt Pavements

Chui-Te Chiu, Tseng-Hsing Hsu, Wan-Fa Yang

Department of Civil Engineering, Chung Hua University, Taiwan

Received 15 March 2007; received in revised form 3 July 2007; accepted 4 July 2007. Available online 21 August 2007

Abstract

This research performed life cycle inventory using proposed recycledmaterial formulas and service records and incorporating the database provided by Eco-indicator 99 in order to study the eco-burden presented by using recycled materials to rehabilitate asphalt pavements. Three recycled materials (recycled hot mix asphalt, asphalt rubber, and Glassphalt) and the traditional hot-mixed asphalt are compared. Assuming that the thickness of the asphalt is 5 cm and the service life is 6 years, the eco-
burden presented by the traditional hot-mixed asphalt is 3.45 kPt. per lane-kilometer. Using recycled hot mixed asphalt can reduce the eco-burden by 23%under the same conditions. Using asphalt rubber increases the eco-burden by 16%, while the eco-burden remains essentially the same (reduced by less than 1%) using Glassphalt. Taking into account the difference in service life between different materials, this research also uses a 40-year time span to evaluate the eco-burden for eachmaterial. The results show that the traditional hot mixed asphalt has an eco-burden of 23.03 kPt. for that time span. Both recycled hot mixed asphalt and asphalt rubber can reduce the eco-burden by 23% in the same period. On the contrary, Glassphalt increases the eco-burden by 19%. This research also identified the sources of the eco-burden for these asphalts. The results showthat a large percentage of the eco-burden comes from two sources, the asphalt binder used (39–48%) and the heat sources required to process these paving materials (42–50%). This suggests that the most effective way to lower the eco-burden may be to reduce the heat requirement during the manufacturing process.

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