ASPHALT PLUS CASE STUDY: I-75 NEAR MACON, GA
I-75 is a major artery in GA, connecting Atlanta to southern Georgia and Florida. The roadway is located in a subtropical climate where stripping and rutting are significant issues for asphalt road construction. The region is exposed to extended periods of higher temperatures, humidity and rainfall.
In preparation for an eventual state specification of the dry mix process, GA DOT contracted for one lane mile of 1.5” dry mix rubberized asphalt overlay on I-75 south of Macon, GA in 2007. The mix design utilized 10 lbs of ASTM minus crumb rubber
After seven years of service, the surface is free of any material cracking and free of
potholes. Multiple evaluations of pavement performance were undertaken by GA DOT staff and GA DOT consultants over the past seven years. No evidence of unusual substrate or surface cracking has been noted to date. Product performance led to a state specification of dry mix asphalt in GA and multiple interstate projects in the following years.
I-75 South of Macon, GA
The road surface was installed without incident, and both plant and road production crews noted that the process was straightforward, forgiving and simple to implement. During placement, the CRM asphalt did not exhibit any of the stickiness typically found with other rubber addition processes. The hot mix product was placed and compacted with ease. Rutting and compaction evaluations of the plant production exhibited excellent results.
GA Interstate and Highway Projects, 2006 –