United States Department of Transportation
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TRIS Online Accession Number:00488135
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Abstract:A paving system was developed in Sweden in the 1960's in which relatively large rubber particles are incorporated into asphalt concrete pavements. The original purpose was to increase skid resistance and durability. This system, distributed under the trade names "Skega Asphalt" or "Rubit" in Scandinavia and "PlusRide" in the U.S.A., was also found to provide a new form of wintertime ice control because of the increased flexibility and the action of protruding rubber particles. The Alaska Department of Transportation and Public Facilities installed five experimental pavement sections using the PlusRide system between 1979 and 1981. Major modifications to normal asphalt pavement aggregate gradations, asphalt contents, and mix design procedures are considered essential to achieve durable non-ravelling rubber-asphalt pavements. The attainment of low voids in the pavement is the primary design and construction objective, and mix design and construction activities are discussed in this report. Observations of the skid reduction benefits under icy road conditions made with a British Pendulum Tester and a vehicle equipped with a Tapley Brake Meter are also reported. The exact extent of benefits in reducing vehicle stopping distances could not be determined from the limited field testing done in Alaska, but tests indicated that significant reductions in icy road stopping distances commonly resulted from the use of the PlusRide paving system. Laboratory tests of PlusRide paving mixes also indicate a potential for greatly increased pavement fatigue life as a result of the elasticity of this material.
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