LABORATORY STUDIES OF ASPHALTIC CONCRETES CONTAINING ASBESTOS FIBERS, RUBBERIZED ASPHALT AND EPOXY-RESIN ASPHALT,
BUREAU OF RECLAMATION DENVER COLO CHEMICAL ENGINEERING BRANCH
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A study on uses of additives for improving asphaltic concrete for hydraulic construction showed that fine asbestos fibers waste screenings can be used advantageously. The increased compressive and tensile strength, stability, and erosion resistance properties gained with the fibers should provide a highly durable material capable of withstanding the major stresses that develop during service. Of the two rubberized asphalts tested, GRS and neoprene, it was indicated that the neoprene asphalt produced the better asphaltic concrete, particularly on the basis of stability and erosion resistance. Compared to the control, asbestos fibers, and rubberized asphalt mixes, the epoxy-asphalt concrete excelled in all physical properties determinations with the exception that flexibility was less than the rubberized asphalt mixes, and erosion resistance was comparable to the asbestos fiber mixes. The epoxy-asphalt concrete appears to be a very strong and tough material for hydraulic construction application however, more data are required relative to its long-term weatherability. The relatively high cost of epoxy-asphalt approximately five times that of normal hot-mix, would restrict its use to special applications.