Section 1038 of the 1991 Intermodal Surface Transportation Efficiency Act (ISTEA) mandated use of crumb rubber from scrap tires in asphalt pavement starting in FY 94. To gain some experience, the Illinois Department of Transportation (IDOT) constructed five demonstration projects in 1993 and one in 1994. All used the "dry process" to introduce Crumb rubber into the mix. With the dry process, crumb rubber is added to the heated aggregate prior to addition of asphalt cement (AC). Three projects used very low addition rates. Each was divided into five equal segments. One segment, the control, used no crumb rubber. The other segments used 1/2, 1, 1 1/2 and 2 pounds of crumb rubber per ton of hot mix. The other three projects each used 20 pounds of crumb rubber per ton of hot mix. Both batch plants and drier-drum plants were used, and the crumb rubber was supplied in pre-measured batch-size packets, 50-pound paper bags and 2000-pound super sacks.
Section 1038(b) of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) (Pub. L. 102-240) required the Department of Transportation an...
Oregon. Department of Transportation. Materials and Research Section
1995-07-01
Abstract:
Over the last nine years, the Oregon Department of Transportation (ODOT) has constructed 13 projects using crumb rubber modifiers (CRM) in asphalt con...
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