Warm mix asphalt: rutting evaluation according to test conditions

Nowadays Warm Mixes Asphalt (WMA) in road applications are widely spread out all around the world, using different technologies, in order to reduce mixing and compaction temperatures of Hot Mixes Asphalt (HMA), but still maintaining the same performance. Under a French-Brazilian scientific cooperation among Polytechnic School of University of São Paulo, Brazil (LTP - Laboratorio de Tecnologia de Pavimentação), Ecole Spéciale des Travaux Publics ESTP (IRC-MO), France, and Laboratoire des Ponts et Chaussées in Nantes (now IFSTTAR), France, this paper presents some results of laboratory tests using WMA technology with additive. The temperatures of mixing and compaction were reduced to 120ºC-130ºC and 110ºC-120ºC, respectively. Mix designs were performed with typical materials from France and Brazil: French Béton Bitumineux Semi-Grenu 0/10 and Brazilian Dense Asphalt Concrete 0/10. The asphalt mixture design was done by conventional tests of both countries, such as French gyratory compactor PCG and Marshall method, showing the relevance or not of these tests since considering the reduction of temperature. Rutting tests were carried out according to European standards, with LCPC rutting tester recommended for axle load of 130kN. Variations in test conditions as temperature, plate thickness and also in bitumen grade can distinguish the behavior of WMA from HMA. Tests confirmed that the bitumen extracted from the WMA showed lower aging than HMA. Besides, this study helps in pointing out the limitation of some tests due to their conditions for evaluating WMA and also shows the necessity of adapting or even of changing them for new technologies.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 13p
  • Monograph Title: 24th World Road Congress Proceedings: Roads for a Better Life: Mobility, Sustainability and Development

Subject/Index Terms

Filing Info

  • Accession Number: 01519963
  • Record Type: Publication
  • ISBN: 2840602679
  • Files: TRIS
  • Created Date: Mar 10 2014 3:08PM