Largest Market For Crumb Rubber ApplicationTimes：2017-07-12 Author：zhengyangtire
Asphalt-Rubber(AR) is a blend of paving grade asphalt cement, ground recycled tire (that is, vulcanized) rubber and other additives, as needed, for use as binder in pavement construction. The rubber shall be blended and interacted in the hot asphalt cement sufficiently to cause swelling of the rubber particles prior to use.” The asphalt-rubber binder is field blended (at the hot mix plant) and requires specialized mobile mixing equipment to produce. Typical crumb rubber modifier (CRM) content for asphalt-rubber ranges from 18-22 percent. The crumb rubber modifier used in asphalt-rubber is in the 10-16 mesh range. Asphalt-rubber been successfully used in California for over 30 years.Asphalt rubber is the largest single market for ground rubber, consuming an estimated 220 million pounds, or approximately 12 million tires. California and Arizona use the most asphalt rubber in highway construction (over 80% of asphalt rubber utilized).
Terminal Blends (TB) are binder materials in the rubberized asphalt concrete that use finely ground (less than 40 mesh) crumb rubber modifier (CRM) and is typically blended at the asphalt refinery. Historically, the primary differences between TB and asphalt rubber (AR) binders were the amount of CRM used in the binder (TB less than 10%; AR15-20%) and the use of specialized mixing equipment for AR. However, in recent years the rubber content in Terminal Blends has been increased to 15-20 % or more. CIWMB now supports the use of terminal blends for chip seals, but does not yet support the use of Terminal Blends (TB) in hot mixes.
By their very nature, Asphalt Rubber and Terminal Blend binders are different products with a different appearance and different properties. But they both serve a valuable role in providing highway agencies with useful pavement preservation strategies and, at the same time, addressing the environmental problem of waste tire disposal
Why Use RAC?
RAC is a proven product–one that has many benefits, including being cost effective, durable, safe, quiet, and an environmentally friendly alternative to traditional road paving materials.
Cost-effective. In most applications, RAC can be used at a reduced thickness compared to conventional asphalt overlays–in some cases at half the thickness of conventional material–which may results in significant material reduction and cost savings. In addition there may be life-cycle cost savings from the reduction in maintenance costs and longevity of RAC.
Durable, Safe and Quiet. RAC is long lasting. It resists cracking, which can reduce maintenance costs. Case studies have demonstrated repeatedly that RAC, when designed and constructed properly, lasts much longer–often 50 percent longer–than conventional materials. Additionally, RAC provides better skid resistance, which can provide better traction. Moreover, RAC retains its darker color longer so that road markings are more clearly visible and can reduce road noise.
Environmentally Friendly. California produces more than 40 million waste tires annually, of which approximately 75 percent are diverted from landfill disposal. The state still faces the challenge of dealing with roughly10 million surplus tires annually. The majority end up in our landfills but some end up in illegal stockpiles. A two-inch-thick RAC resurfacing project uses about 2,000 scrap tires per lane mile. Over the past few years, California has used more than 10 million waste tires in RAC paving projects, diverting them from landfills or illegal disposal.
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