United States Department of Transportation
i
Analysis of Ground Tire Rubber (GTR) in Mix Design on Local Roadways in Ohio
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2018-02-01
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[PDF-3.70 MB]
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Edition:Final Report
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Abstract:This report summarizes the results of a research project that was conducted to: 1) evaluate the long-term field performance and life cycle cost of Ground Tire Rubber (GTR) modified pavement sections in Ohio and compare them to those obtained for pavement sections constructed using conventionally modified polymer modified asphalt mixtures, and 2) identify and examine new GTR technologies that may reduce the initial cost of GTR mixtures in Ohio. This project was divided into two phases. The results of Phase 1 of this project identified three GTR modified binders that potentially could lower the cost of GTR mixtures. The results of the laboratory tests showed that mixtures prepared with these GTR modified binders had better resistance to low-temperature and fatigue cracking as well as rutting than those prepared using the polymer modified PG 70-22 binder. Phase 2 of this project involved constructing test sections as part of resurfacing projects in the City of Columbus and the City of Akron. Four test sections were constructed in the City of Columbus. In the first test section (control section), a styrene-butadiene-styrene (SBS) polymer modified PG 70-22M binder was used in the surface course mixture. Furthermore, the surface course mixtures in the other three sections included a PG 64-22 binder modified with 7% MicroDyne™-400, a PG 64-22 binder modified with 6% MicroDyne™-400 GTR and 0.5% Rheopave and a PG 64-22 binder modified with 7% Liberty -30 mesh GTR. Two test sections were constructed in the City of Akron. While the surface course mixtures in first sections included a SBS modified PG 70-22M binder, a PG 64-22 binder modified with 6% MicroDyne™-400 GTR and 0.5% Rheopave was used in the surface mixture of the second section. Cores were obtained at different locations within each test section. Laboratory tests were conducted to evaluate the cracking resistance and durability of the field cores. The results of the laboratory tests showed that the field cores obtained from GTR sections had acceptable resistance to low-temperature and fatigue cracking as well as moisture-induced damage, which were, in general, similar to that of the SBS polymer modified PG 70-22M test section. No distresses were observed in any of the SBS polymer and GTR test sections during the first year of service. Cost analyses conducted in this study indicated the cost of GTR mixes may be lower than that of SBS polymer modified mixes if the GTR mixes become more widely used by local public agencies in Ohio.
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