HFST ATSSA 2013 Donna Hardy
ATSSA’s 43rd Annual Convention & Traffic Expo February 25, 2013
When leaving the road is not an option!
Road Departure accounts for 75% of WV Fatalities
Tining Concrete Surfaces Ave Skid = 40’s Microsurfacing – Polymer-modified cold mix paving Ave Skid = 50’s
Product may be applied either manually or mechanically. Ave Skid = High 70’s - low 80’s
DETOUR – WV’s terrain often causes the detour to be the driving force in amount of time a road/lane can be closed. Some detours are 2 hours out of drivers way. Locations for stockpile of material – no shoulders. Length of Project Time of Year
› Temperature › Humidity
Evaluated crash/maintenance data and pinpointed locations prone to roadway departure Calculated benefit /cost ratio for each location and selected locations that represented conditions on WV’s vast roadway system. Examine existing pavement condition
› Remove all magnesium from location and
replace patch with non-magnesium concrete › Verify Subsurface Condition
BAUXITE is only aggregate allowed in WV Temperature above 50 degrees (initial 40 degrees was used but changed after first year of projects) Clean, dry surface (may require cleaning) Free of potholes and subsurface failure Low humidity Shot blast bridge decks prior to application and allow for more polymer on grooved bridge decks.
26 sites completed 17 sites programmed 8 sites planned
Completed jobs › 4 sites were manual › 22 sites were mechanical
25 Sites were Horizontal Curves 1 Site was Vertical Curve where road was beside a river.
9 out of 10 Districts have HFST
First completed high friction surface treatment project (June 2011) Vendor mechanically applied WVDOH paid for material only Drastic reduction in road departure crashes was observed
1 Year Skid = 85.8
Of the 26 completed sites, WVDOT had issues at 3 sites. Review of different application methods revealed issues and correction was made at no cost to WVDOT. No further issues have been reported at first 2 sites. Correction has not been made on 3rd site, WVDOT is still in negotiations. 1. WV 20, Mercer County 2. I-77, Mercer County 3. WV 26, Preston County
Existing road has many vertical and horizontal curves
There was a shortage of binder material and job was delayed Binder and aggregate were initially applied manually and then reapplied mechanically Project took much longer then anticipated and humidity played a factor in cure time. aggregate stockpile was too far from application and aggregate did not adhere
“Holes” appeared in aggregate Loose aggregate on shoulders Review of site determined that epoxy set up before aggregate could adhere.
1 Year Skid = 76.9
Road was listed in Transparency 5% Report Shown to exhibit the most severe safety needs on the interstate system in WV Existing road had both vertical grade issues and many horizontal curves Cable median was continuously being repaired Contractor mechanically applied
“Holes” appeared in aggregate
Work performed under lane closure. Active lane had heavy truck traffic at high rate of speed. Application truck traveling at higher speed then recommended.
1 Year Skid = 79.2
Lessons Learned: › Traffic was moved farther over away from
construction lane › Application truck speed was reduced to ensure enough epoxy was placed.
Area experiences heavy snow and plows have not damaged HFST.
• • • • • • •
Both Horizontal and Vertical Curves Project was applied manually Project completed 10/12 (photos were taken in 12/12) Several “holes” developed in aggregate immediately Loose aggregate throughout project Currently negotiating with contractor As of 1/13 snow plows have removed majority of surface
19 Sites are Horizontal Curves 4 Sites Vertical Curve 1 Site Interchange 1 Site Bridge
By End of 2013 – all 10 Districts will have HFST
SNOW COUNTRY
Districts are checking sites for product failure › Snow Plow Damage › Aggregate Loss
Mobility and Safety Section is evaluating any crash that has occurred after high friction surface treatment has been applied (will do a 3 year post versus 3 year prior evaluation) Skid Friction is taken at set interval to ensure product maintain high numbers – average 1 year skid is 80.6
Testing roadway temperatures with Mobile RWIS to see if HFST has slower icing rate Experimenting using High Performance Tape for centerline stripe Experimenting HFST on manholes, and steel deck components. Experimenting with addition of an electric grid.
Working on criteria that includes: o Vertical Grades o Horizontal Curves o Bridges that have shown to freeze before roadway o Low lying roads that parallel rivers o Locations were natural springs are in close proximity to roadway, and roadway is in shade for majority of the day
Initial Engineer’s Estimate was developed using bid prices from other states. No additional work was included in estimate First year of bids averaged 144% above Engineer’s Estimate Prefer vacuum sweeper instead of mechanical sweeper. Limit letting schedule of projects to ensure temperature long enough to get acceptable cure times for product Cannot apply over Magnesium Roadway surface must be repaired prior to installation Limit locations where manual application is allowed.
When leaving the road is not an option!
Road Departure accounts for 75% of WV Fatalities
Tining Concrete Surfaces Ave Skid = 40’s Microsurfacing – Polymer-modified cold mix paving Ave Skid = 50’s
Product may be applied either manually or mechanically. Ave Skid = High 70’s - low 80’s
DETOUR – WV’s terrain often causes the detour to be the driving force in amount of time a road/lane can be closed. Some detours are 2 hours out of drivers way. Locations for stockpile of material – no shoulders. Length of Project Time of Year
› Temperature › Humidity
Evaluated crash/maintenance data and pinpointed locations prone to roadway departure Calculated benefit /cost ratio for each location and selected locations that represented conditions on WV’s vast roadway system. Examine existing pavement condition
› Remove all magnesium from location and
replace patch with non-magnesium concrete › Verify Subsurface Condition
BAUXITE is only aggregate allowed in WV Temperature above 50 degrees (initial 40 degrees was used but changed after first year of projects) Clean, dry surface (may require cleaning) Free of potholes and subsurface failure Low humidity Shot blast bridge decks prior to application and allow for more polymer on grooved bridge decks.
26 sites completed 17 sites programmed 8 sites planned
Completed jobs › 4 sites were manual › 22 sites were mechanical
25 Sites were Horizontal Curves 1 Site was Vertical Curve where road was beside a river.
9 out of 10 Districts have HFST
First completed high friction surface treatment project (June 2011) Vendor mechanically applied WVDOH paid for material only Drastic reduction in road departure crashes was observed
1 Year Skid = 85.8
Of the 26 completed sites, WVDOT had issues at 3 sites. Review of different application methods revealed issues and correction was made at no cost to WVDOT. No further issues have been reported at first 2 sites. Correction has not been made on 3rd site, WVDOT is still in negotiations. 1. WV 20, Mercer County 2. I-77, Mercer County 3. WV 26, Preston County
Existing road has many vertical and horizontal curves
There was a shortage of binder material and job was delayed Binder and aggregate were initially applied manually and then reapplied mechanically Project took much longer then anticipated and humidity played a factor in cure time. aggregate stockpile was too far from application and aggregate did not adhere
“Holes” appeared in aggregate Loose aggregate on shoulders Review of site determined that epoxy set up before aggregate could adhere.
1 Year Skid = 76.9
Road was listed in Transparency 5% Report Shown to exhibit the most severe safety needs on the interstate system in WV Existing road had both vertical grade issues and many horizontal curves Cable median was continuously being repaired Contractor mechanically applied
“Holes” appeared in aggregate
Work performed under lane closure. Active lane had heavy truck traffic at high rate of speed. Application truck traveling at higher speed then recommended.
1 Year Skid = 79.2
Lessons Learned: › Traffic was moved farther over away from
construction lane › Application truck speed was reduced to ensure enough epoxy was placed.
Area experiences heavy snow and plows have not damaged HFST.
• • • • • • •
Both Horizontal and Vertical Curves Project was applied manually Project completed 10/12 (photos were taken in 12/12) Several “holes” developed in aggregate immediately Loose aggregate throughout project Currently negotiating with contractor As of 1/13 snow plows have removed majority of surface
19 Sites are Horizontal Curves 4 Sites Vertical Curve 1 Site Interchange 1 Site Bridge
By End of 2013 – all 10 Districts will have HFST
SNOW COUNTRY
Districts are checking sites for product failure › Snow Plow Damage › Aggregate Loss
Mobility and Safety Section is evaluating any crash that has occurred after high friction surface treatment has been applied (will do a 3 year post versus 3 year prior evaluation) Skid Friction is taken at set interval to ensure product maintain high numbers – average 1 year skid is 80.6
Testing roadway temperatures with Mobile RWIS to see if HFST has slower icing rate Experimenting using High Performance Tape for centerline stripe Experimenting HFST on manholes, and steel deck components. Experimenting with addition of an electric grid.
Working on criteria that includes: o Vertical Grades o Horizontal Curves o Bridges that have shown to freeze before roadway o Low lying roads that parallel rivers o Locations were natural springs are in close proximity to roadway, and roadway is in shade for majority of the day
Initial Engineer’s Estimate was developed using bid prices from other states. No additional work was included in estimate First year of bids averaged 144% above Engineer’s Estimate Prefer vacuum sweeper instead of mechanical sweeper. Limit letting schedule of projects to ensure temperature long enough to get acceptable cure times for product Cannot apply over Magnesium Roadway surface must be repaired prior to installation Limit locations where manual application is allowed.
