Trr No. 1171 Asphalt Materials And Mixtures, pp. 113-120
Rubber modified asphalt pavement mixtures have been used in Sweden and The US. In these applications ground, recycled tyre particles are added to a gap graded aggregate and then mixed with hot asphalt cement. The benefits of adding rubber to the mix include increased skid resistance, elimination of a solid waste, and reduce traffic noise. the major disadvatage of these rubber modified mixtures is their high initial cost compared with conventional asphaltic concrete pavements. One such modified asphalt mixture used in the US is described. The mix ingredients and typical properties are first presented. The requirements for adding and controlling one additional ingredient and for producing an unusual aggregate gradation (gap graded aggregate) have resulted in construction problems on some projects. These problems can be avoided by proper specification, controls and inspections.