Abstract: Process of providing a rubberized asphalt from reclaimed rubber produced from whole scrapped tires and having a composition of about 15-20 percent acetone extractible oils, resins, and other rubber compounding ingredients such as antioxidants, antiozants, emulsifiers, and the like, about 10-35 percent carbon black, about 10-20 percent ash primarily from zinc oxide, titanium dioxide, clay, whiting, and talc, and about 35-45 percent rubber hydrocarbon of which 15-30 percent is a mixture of synthetic rubbers such as SBR, neoprene, polybutadiene, isoprene, butyl, and chlorobutyl, and other 10-20 percent is natural rubber and an asphalt at a level of 5-25 percent rubber to 75-95 percent asphalt by weight, the asphalt having a composition of 20-30 percent asphaltenes, 5-15 percent nitrogen bases, 10-20 percent first acidaffins, 30-40 percent second acidaffins, and 10-20 percent paraffins, and the rubber and asphalt being cooked at about 350-450 degrees F.

Abstract: A portland-cement stabilized soil base for a roadway is covered with an elastic rubber-asphalt layer and thereafter with a surfacing layer. The elastic layer may be formed by reacting 1 to 30% by weight of asphalt with 99-70% by weight of rubber and be applied hot as by spraying; and the surfacing layer will ordinarily be asphalt concrete composed of asphalt binding aggregate particle such as coarse stone, together. Preferably the elastic layer covered with a layer to prevent bonding of the elastic layer with an overlying asphalt concrete layer. Such bonding-preventing layer may be finely crushed stone, roofing paper, non-woven fabric, or plastic film, or the like.