Observations on belgian roads have not yet demonstrated any significant effect on polymer additives on the performance of porous asphalts, also known as open-graded asphaltic concrete or open-graded friction course. Nevertheless, they have shown that there may be local problems with pure bitumen draining by gravity through the bituminous material during mixing, transport, and laying. This occasionallyhappens. Screg belgium has developed porous asphalt mixes containing pure bitumen and organic fibers. Numerous tests carried out on itsinitiative, both in the laboratory and on roads, have confirmed theanti-draining action of cellulose fibers, which makes it possible to lay low-cost, high performance porous asphalt with an eventual higher bitumen content, while solving the occasional problem of binder drainage. This paper appears in transportation research record no. 1265, Porous asphalt pavements: an international perspective 1990.
Abstract