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This study was conducted to determine the current and future supply of scrap tire rubber and the feasibility of using scrap tires in Kansas for various purposes. The goal was to determine if a sufficient quantity of recycled rubber existed and what the cost would be to meet the ISTEA (Intermodal Surface Transportation Efficiency Act) requirements for 1995 and thereafter. The four tasks included in the study were: surveying scrap tire utilization plans in other states; inventorying scrap tires in Kansas; estimating scrap tire generation in the future; and determining cost effectiveness of various uses of scrap tires. Currently there are 4.5 to 5.5 million scrap tires in Kansas and the annual generation of scrap tires is estimated to be 2 to 3 million. The ISTEA mandate would require an estimated 367,000 scrap tires be recycled annually. The Kansas Department of Transportation has used more rubber in 1993 and 1994 than will be required by 1997 when the 20% required by ISTEA is in effect. The most energetically and economically feasible method of disposal of scrap tires is as a fuel substitute for coal or natural gas in a co-fired application or in a dedicated scrap tire-to-energy facility. One of the cement producers in Kansas currently uses between 250,000 and 600,000 scrap tires annually for fuel.
The major objective of this project was to formulate a Chunk Rubber Asphalt Concrete (CRAC) mix for use on low volume roads. CRAC is a rubber modified asphalt concrete product produced by the 'dry process' where rubber chunks of 1/2 inch size are used as aggregate in a cold mix with a type C fly ash. The second objective of this project was to develop guidelines concerning the use of rubber modified asphalt concrete hot mix to include: 1) design methods for use of asphalt-rubber mix for new construction and overlay; 2) mix design method for asphalt-rubber; and, 3) test method for determining the amount of rubber in an asphalt-rubber concrete for quality control purposes.
The official magazine of Waste Expo.
Section 1038 of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) contains provisions for each State to begin incorporating scrap tire rubber into their asphalt paving materials. A workshop was developed through the cooperation of highway agencies and the asphalt industry to discuss present procedures and practices for designing and constructing asphalt pavements which incorporate scrap tire rubber (crumb rubber modifier). These workshop notes were prepared from the proceedings of the 13 workshop sessions.