October 3rd, 2012
ROUGHED UPUncategorized, by Catherine Higgins.
UDOT is participating in a study of High Friction Surfacing as part of a nationwide study sponsored by FHWA.
On sharp curves, freeway ramps or steep hills, rain and high speeds can combine to create dangerous slick conditions, especially for semis or other large vehicles. FHWA is reaching out to UDOT and other states to promote the study and possible implementation of HFS. Several states have used HFS and realized an immediate reduction in crashes.
HFS, usually consisting of an epoxy binder and a non-polishing aggregate, improve roadway skid-resistance in places where motorists need help to brake more effectively. HFS improve skid resistance by applying a microtexture that increases pavement-tire friction. The aggregate used in HFS is critical; calcined bauxite is used often because it maintains it’s microtexture and resists material loss under heavy traffic.
UDOT has identified two locations, one in Payson and one in Logan Canyon, where HFS will be evaluated. Before and after studies that look at crash data, skid resistance, and other factors, will provide the basis for an objective assessment. UDOT will also monitor how the HFS tolerates weather extremes, traffic and snow plows.
If the treatment is shown to be effective, UDOT may draft a specification or special provision to allow HFS to be used at other appropriate locations.
See the slide show above to see a step by step narrative of how the treatment was applied in Payson. For photo captions, click on the images.