ABSTRACT
Tilcon Limited have supported a research project carried out by the Civil Engineering Materials Unit at the University of Leeds. The primary aim of research is to assess the energy savings which may result from the use of pulverised fuel ash as a filler in hot rolled asphalt wearing course mixtures. Laboratory evaluation of four typical “design type” hot rolled asphalt mixtures established the validity of the proposal for the range of aggregate types used in four coating plants from the English Midlands to Central Scotland. The production stage of the project involved the production and laying of material on a Principal Road controlled by Cleveland County Council. The material was divided between a control mixture with ground limestone filler, and the trial mixture. The paper gives details of the energy monitoring which took place during production, suggesting a potential reduction in energy use of around 10%. Details of the evaluation of the trial site are given, including delivery and rolling temperatures, rate of spread of chippings and measured texture depth. The paper concludes that hot rolled asphalts with PFA filler are worthy of further consideration.
