Crumb Rubber Asphalt Perry GA
Crumb Rubber Asphalt Perry GA
This Asphalt Plus case study highlights GA DOT’s 2007 dry mix rubberized asphalt overlay on I-75 south of Macon near Perry, GA. The project compared a chemically engineered crumb rubber asphalt mix with a polymer-modified control mix in a region where heat, humidity, rainfall, stripping, and rutting are significant roadway challenges.
Project Overview
GA DOT contracted for their first one lane mile of 1.5” dry mix rubberized asphalt overlay on I-75 south of Macon, GA near Perry, GA in 2007.
Project Location
I-75 south of Macon, GA near Perry, GA.
Asphalt Plus Case Study: I-75 Near Perry, GA
I-75 South of Macon, GA
Dry Mix Rubberized Asphalt Overlay
The project design utilized two mixes: one including rubber and a second modified asphalt mix that served as a control.
First Mix Design
The first mix design was PEM that included a SBS Polymer Modified 64 -22 base binder with a performance grade of 76 -22.
Second Mix Design
The second mix design used the same PEM mix design and base binder, but instead of SBS, the mix was modified with the addition of a chemically engineered crumb rubber introduced as an aggregate.
Crumb Rubber Asphalt Addition Rate
This second mix included the addition of 10 lbs. of minus 30 recycled tire crumb rubber per mix ton.
The pre-blended dry rubber product was fed into the production plant through the RAP collar using a modified fiber machine.
Rubber Feed Rate
The rubber feed rate was matched to the plant operating rate so that the proportions of rubber and binder remained constant.
Production and Laydown Personnel
Both production and laydown personnel did not report any difficulties with the rubberized product.
I-75 South of Macon, GA
The original expectations for mix performance on these test strips was five to seven years.
GDOT commissioned two follow-up reports on this project and on a project located on I20 that utilized rubber and polymer modified SMA designs.
Both mixes are still in service in 2019, twelve years after placement.
Both the polymer and rubberized pavements are showing similar distress, including some cracking and stripping, and both pavements significantly exceeded expectations for this application.
Project Summary
This crumb rubber asphalt case study near Perry, GA focused on a one lane mile, 1.5” dry mix rubberized asphalt overlay on I-75 south of Macon, GA. The project compared a PEM mix with a SBS Polymer Modified 64 -22 base binder and a second PEM mix using the same mix design and base binder, modified with chemically engineered crumb rubber introduced as an aggregate. The second mix included 10 lbs. of minus 30 recycled tire crumb rubber per mix ton. Both mixes were still in service in 2019, twelve years after placement, and both pavements significantly exceeded expectations for this application.
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