columbus, ohio october 28, 2015 larry galehouse, p.e., · pdf filedirector, national center...
TRANSCRIPT
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Larry Galehouse, P.E., P.S. Director, National Center for Pavement Preservation
Columbus, OhioOctober 28, 2015
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Topic 5: Design Formulas
Topic 6: Calibration
Topic 7: Equipment
Topic 8: Construction
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0.7 H H
Average Least Dimension (H)
Embedment (0.7 H)How is the Average Least Dimension calculated ?
Inputs: Median Particle SizeFlakiness Index
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Median Particle Size• Determined from the gradation chart. • The theoretical sieve size through which 50
percent of the material passes (50 percent passing size).
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Average Least Dimension (H)
H =
Where: H = Average Least DimensionM = Median Particle SizeFI = Flakiness Index
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Loose Unit Weight of Cover Aggregate• Necessary to determine voids present
Aggregates
Voids
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Loose Unit Weight of Cover Aggregate
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Voids in Loose Aggregate
V = 1 ‐
Where: V = Voids in Loose Aggregate (percent)W = Loose Unit Weight of Cover Aggregate
(ASTM C 29)G = Bulk Specific Gravity
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Aggregate Application Rate
C = 46.8 (1 – 0.4V) HGE
Where: C = Cover Aggregate Application Rate, lbs/yd2
V = Voids in Loose Aggregate (percent expressed as decimal)H = Average Least Dimension (expressed as decimal inch)G = Bulk Specific Gravity of AggregateE = Wastage Factor for Sweeping (from Table)
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Emulsion Application Rate
B =
Where: B = Emulsified Asphalt Application Rate, gal/yd2
H = Average Least Dimension (expressed as decimal inch)T = Traffic FactorV = Voids in Loose Aggregate (percent expressed as decimal)S = Pavement Surface Texture (from Table)A = Aggregate Absorption Factor (from Table)R = Residue Asphalt Content of Emulsion
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Distributor Spray Bar
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Spray Bar Nozzle Alignment
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Fans are the same width Fans are different widths
Same Angle Different Angles
Spray Bar Nozzle Alignment
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Spray Bar Nozzle Alignment
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±
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Too High = Ridges Too Low = Gaps
Adjusting Spray Bar Height
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Improper Spray Bar Height
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Distributor Controls
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#6 Recommended for Chip Seals
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Calibrating Spray Bar
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Aggregate Spreader
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ASTM D5624-95
Calibrating Aggregate Spreader
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Calibrating Aggregate Spreader
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Calibrating Aggregate Spreader
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Calibrating Aggregate Spreader
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Calibrating Aggregate Spreader
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Calibrating Aggregate Spreader
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Calibrating Aggregate Spreader
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Calibrating Aggregate Spreader
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Properly CalibratedAggregate Spreader
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Asphalt Distributor Truck
• Distributor shall have a ground speed control device interconnected with the emulsified asphalt pump
• Capable of maintaining the specified application rate within +/- 0.015 gal/yd2 for each load
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Asphalt Distributor
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Asphalt Distributor Truck
• Regulate the amount of asphalt sprayed on the roadway• Regulate spray pattern• Typical spray
bar width is 12 feet wide
• Extended spray bar width is up to 24 feet
• Nozzles evenly spaced (every 4 inches)
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Asphalt Distributor Preparation
• Calibrate• Blow nozzles• Check bar height• Check transverse alignment• Check emulsion temperature• Ensure adequate emulsion supply
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Aggregate Spreader
• Self-propelled mounted on pneumatic-tired wheels• Computerized spread control• Adjustable gates capable of distributing aggregate at the
designed rate
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Pneumatic Rollers
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Pneumatic Rollers
• Rollers capable of ballast loading to allow weight to be varied from 6 to 8 tons
• Minimum contact pressure of 80 lbs/in2 to achieve aggregate mechanical interlock
• All tires shall be as supplied by the roller manufacturer
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Pneumatic Rubber Tire Rollers
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Pneumatic Rubber Tires
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Sweepers• Clean existing roadway before
chip seal application• Remove excess aggregate from
completed seals• Types include: Rotary, Pick-up,
and Vacuum Brooms
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Pick up Sweeper
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Angle Sweeper – Kick Broom
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Weather Conditions for Construction
Air Temperature: HighRelative Humidity: LowWind Velocity: MinimalPrecipitation: None
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Temperature Considerations
• Ambient air temperature should beabove 60º F for asphalt emulsions
• Roadway surface >60º F and <130º F
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SunShade
Consider Pavement Temperature
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Irrigation Runoff
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Crack Filling
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Surface Preparation• Repair surface holes and depressions• Level surface irregularities affecting ride• Remove all excessive asphalt (patches / joints)• Mill surface if extensive loose material• Crack fill (all larger cracks >⅛”) • Remove pavement markers & delineators• Clean roadway – full width (sweeping)
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Place Paper at Start of Run
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Pneumatic Rollers• Orient particles to their least dimension
• Use a minimum of 3 rollers and position in echelon to cover the entire lane width
• Maintain speed less than or equal to three miles per hour
• Three complete roller passes of the aggregate chips are required.
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Temporary Markers
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Traffic Control
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Sweeping
• Sweep within 3 hours of placement
• Never open to traffic without sweeping
• Re-sweep prior to opening to unrestricted traffic
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Fog Sealing
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Application of Fog Seal
• Fog seal all chip seal areas after sweeping and before placing permanent pavement markings
• Diluted emulsified asphalt should be initially applied at an application rate of 0.06 to 0.12 gal/yd2.
• Construct a 100 foot test strip and adjust application rate as needed.
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• Use SS‐1h or CSS‐1h emulsified asphalt
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• Use diluted asphalt emulsion with not less than 28% residue
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Fog Seal Basics
• No rain forecasted (3 hour minimum)• Environmental conditions dictate time of cure• Nozzles sized for uniform application• Distributor is calibrated and working properly• Operator is trained and qualified• Overlap centerline at ≥ 1 foot• Lightly sand intersections & higher use areas
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Fog Seal Benefits
1. Accelerates curing of pavement because of dark color
2. Harder asphalt over top of the soft elastomeric asphalt underneath
3. Locks down marginally embedded chips4. Reduces amount of paint needed and makes
pavement marking more visible5. Limits snowplow damage
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Final Product
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Customers perceive new overlay
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Chip seal after 5 months
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Recommended Basis of PaymentItem No. Item Unit
State ## Emulsified asphalt for Chip Seal Gallon
State ## Diluted emulsified asphalt for Fog Seal Gallon
State ## Aggregate used in the Chip Seal Square Yard
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