Industrialized countries concentrate their road policies on improving safety conditions and on easing road displacements, and they also focus on protection with respect to the bordering populations, maintenance workers and, in a more general way, the environment. This paper provides an assessment of the current research on hot bituminous mixes, produced by various means, from the perspective of meeting environmental requirements, and reducing power consumption. After defining the terminology describing bituminous mixes, the general principles of the various processes of making warm mixes of asphalt are presented. The range of these bituminous mixes includesthe techniques known as semiwarm (temperature lower than 100degreesC) andtechniques known as warm (temperature higher than 100degreesC, with a reduction of 20 to 40degreesC compared to traditional hot bituminous mixes). The characteristics and performances expected from these bituminous mixes,both mechanical and environmental, are reviewed. The results provided by companies and from some follow-ups carried out by the Scientific and Technical Network (RST) provide comparative studies from the laboratory and theearly phases of on-site performance. For the covering abstract see ITRD E139491.
Samenvatting