Experimental Results on Warm Asphalt Mixes in Czech Republic

One of the environmentally most important factors of asphalt pavements is the energy demand necessary due to satisfactory workability and compactability of an asphalt layer. Economical energy consumption on one hand and sufficient quality of asphalt pavements on the other hand can be seen as important factors of its sustainability. Both characteristics have therefore crucial role in the so called environmental compatible pavement structure. There are several possibilities or techniques how energy demand can be reduced and durability preserved or increased. Important set of these techniques, called warm asphalt mixes has been in this respect developed during the last ten years in Europe and the United States. There are several possibilities, how these mixes can be produced.

The paper presents warm asphalt mixes experimentally prepared and assessed with various additives of synthetic waxes or polyphosphoric acid. For the experimentally prepared asphalt mixes a comparison of their mechanical as well as rheological properties is summarized and discussed.