Ground Tire Rubber (GTR)
Ground Tire Rubber (GTR) a.k.a. Crumb Rubber Modifier (CRM) Background and Activities. FHWA continues to encourage the use of waste tire rubber in engineering applications, including asphalt paving, where it is both cost effective and it can be properly engineered. States are not required to use crumb rubber in asphalt paving, but, when requested, FHWA provides technical assistance and will continue to provide technology transfer. https://www.fhwa.dot.gov/pavement/asphalt/crmbrubr.cfm.
Recent technical documents include:
- Recycled Tire Rubber – Hybrid GTR Binders and Dry Added GTR – How to use them in Asphalt Pavement Mixtures, FHWA-HIF-22-011, 2021
- Resource Responsible Use of Recycled Tire Rubber in Asphalt Pavements, FHWA-HIF-20-043, 2020
- TechBrief: The Use of Recycled Tire Rubber to Modify Asphalt Binder and Mixtures, FHWA-HIF-14-015, 2014
- Crumb Rubber