Foamed Bitumen in Half-Warm Asphalt: A Laboratory Study

Hilde Soenen ； Joelle De Visscher ； Frederik Vervaecke ； Ann Vanelstraete ； Per Redelius

《International Journal of Pavement Research and Technology》 3卷4期 (2010/07) Pp. 199-206

https://doi.org/10.6135/ijprt.org.tw/2010.3(4).199

並列摘要

Techniques to reduce production temperatures of asphalt have become popular. In warm techniques, mixing temperatures are reduced to around 120-130°C; while in semi-or half-warm techniques, asphalt mixing temperatures are below 100°C. In cold paving technology, asphalt is produced at ambient temperature. In the last two techniques, the aggregates still contain considerable amounts of moisture. Moreover, in these techniques the presence of water is required to some extent. Of course, the savings in energy and emissions are considerably large, when there is no need to fully dry all the materials. In 2006, Nynas and the Belgian Road Research Centre started a project to evaluate the performance of hot versus warm and semi-warm produced asphalts. In the half-warm technique, foamed bitumen, wet aggregates, and a mixing temperature of 90°C were used. This publication focuses on the laboratory evaluation of the foam technique. Several parameters were varied, including the moisture content of the aggregates at mixing, the time lag between mixing and compaction of the asphalt, the influence of adding active filler, and the effect of foaming the binder versus just adding hot bitumen to the mixture. The evolution of the mechanical properties after compaction was also followed as a function of time.

並列關鍵字

Curing ； Foamed bitumen ； Half-warm ； Reduction of production temperature