This report describes the third of three experimental installations of open-graded friction course (OGFC) “quieter pavements” designed to reduce the noise generated at the tire/pavement interface. Experimental sections of OGFC were built using asphalt rubber (AR) and styrene-butadiene-styrene (SBS) modified asphalt binders. A section of conventional hot mix asphalt (HMA) served as the control section for the two experimental sections.
The noise level of the OGFC-AR test section was audibly quieter (3 dBA or greater quieter) than the HMA control section for only a period of ten months after construction. The OGFC-SBS section was audibly quieter than the HMA for one month after construction.
The amount of wear/rutting on this project was less than on the other two quieter pavement projects. The reason was that this project was not subject to the same weather and traffic conditions as the other two projects. The other projects were subject to a severe winter storm that resulted in a higher use of studded tires and chains for an extended time period.
Pavement condition data showed that the OGFC-AR pavement was less resistant to reflection cracking than the OGFC-SBS pavement.
Open graded friction course quieter pavements are not recommended for use in Washington State due to the short duration of their noise mitigation properties.