Use of Shell Thiopave in asphalt
Shell Thiopave TM is a patented additive developed by Shell for use in asphalt paving mixtures. The additive is intended to act both as a bitumen extender and as an asphalt mixture modifier. The use of sulphur also has the benefit of lowering the compaction temperature of the asphalt paving mixtures. The additive is added to the pre-heated aggregates and bitumen during the mixing process rather than the sulphur being pre-blended with the bitumen. Experience with the product was obtained with sites in Canada, the USA, Saudi Arabia, Qatar and China. The Marshall properties, deformation resistance, stiffness, fatigue, low temperature crack resistance and water sensitivity are described. Health and safety issues and pavement design implications are considered. The pelletisation of the sulphur by Shell in Thiopave TM has overcome many of the health and safety issues, although strict control of temperature still needs to be maintained. the primary advantages of Thiopave TM-modified asphalt are an increase in strength, stability and possibly durability. The resulting economic advantages are reduced bitumen consumption, reduced pavement thicknesses and lower energy consumption.
NICHOLLS, J C
TRL STAFF PAPERS
Highways; Pavements; Safety and Human Factors; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials
Transport Research Laboratory
Crowthorne House, Nine Mile Ride
Jun 3 2010 7:45AM