United States Department of Transportation
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More Documents Available as Supporting Files
Use of Fine Graded Mixes for Pavement Preservation: Workshop Materials
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2012-08-01
[PDF-7.56 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION
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Abstract:TxDOT has to explore new ways to maintain low volume roads besides just doing chip seals. Chip seals are a good way to keep roads sealed but when this treatment is used close to populated areas it can create some problems with road noise. The state of New Mexico has significantly improved the performance of their low volume pavements in the past 10 years. Many people have noticed the good performance of a specific type of Open Graded Friction Course (OGFC) that is currently used on many low volume roads in New Mexico. The OGFC is finer and placed significantly thinner than TxDOT’s PFC mixes. The typical OGFC in New Mexico is placed at a thickness between 1/2” and 3/4”. This mix is used as an alternate to seal coat or microsurfacing. The mix is much quieter and smoother than a typical seal coat or microsurfacing. Such a mix could give TxDOT more or better options regarding surfacing low volume roadways. Other states are using fine grained dense mixes to execute thin overlays on aged pavements that do not require strengthening. These types of overlays last longer than chip seals and are more appealing especially for urban environments. This project ends Aug 2012, the main deliverable is a new spec which is already being implemented into TxDOT’s new HMA specs under review in Summer of 2012.
The .pdf in the Viewer tab is the workshop "Instructor Notes." Other workshop materials can be found in the .zip file in the "Supporting Files" tab.
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