A laboratory study on the use of waxes to reduce paving temperatures

There is considerable interest in the possibilities of producing and paving asphalt at reduced temperature. A reduction of the temperature generates a significant reduction in energy consumption, emissions and fumes. Also health and safety conditions for the road workers are improved.

There is considerable interest in the possibilities of producing and paving asphalt at reduced temperature. A reduction of the temperature generates a significant reduction in energy consumption, emissions and fumes. Also health and safety conditions for the road workers are improved.

There is considerable interest in the possibilities of producing and paving asphalt at reduced temperature. A reduction of the temperature generates a significant reduction in energy consumption, emissions and fumes. Also health and safety conditions for the road workers are improved.

This paper presents the first results of a common research project of Nynas and BRRC, in which three techniques for reducing production temperatures are considered: the addition of waxes as viscosity reducers, the addition of zeolites as foaming agent and the use of foamed bitumen. The first phase of the project aims at developing laboratory procedures for assessing the potential of each technique to reduce the production temperature. If the mix undergoes curing after compaction, procedures to simulate and possibly accelerate the curing process also need to be developed. Small field trials are planned to validate the outcome of the laboratory work. In a second phase, the performance of the mixes produced at reduced temperature will be evaluated and compared to standard hot mix asphalt, since requirements on asphalt performance (including stiffness, durability, resistance to permanent deformation and cracking) have to be fulfilled. Test sections are planned in a third phase, to extrapolate and validate the laboratory results by field data and experience. This paper describes the first phase results of the technique using waxes as viscosity reducers.

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Authors

H. Soenen, T. Tanghe, P. Redelius, J. De Visscher, F. Vervaeke, A. Vanelstraete

E&E conference May 2008, Copenhagen