surface treatments – keys to successdata.abacus.hr/h-a-d/radovi_s_kongresa/apaca pavement... ·...
TRANSCRIPT
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Surface Treatments –
Keys to Success
Rita B Leahy, PhD, PE Technical Director
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Carl Monismith Hans Ho Gary Hicks Sara Alzate
To steal from one is plagiarism. To steal from many is research.
Acknowledgements
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Surface Treatments
Types/Terminology Purpose Treatment Selection Keys to Success Resources
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Terminology
Surface Treatment Seal Coat Bituminous Surface Treatment Ultra-Thin, Hot Mix Bonded Overlay Thin Functional/Maintenance Overlay
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Types
Seals Fog Rejuvenating Slurry Chip Cape SAM Scrub
Microsurfacing Ultra-Thin HMA
(Bonded Wearing Course)
Thin, Maintenance Overlay
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Treatment Purpose
seal or waterproof
raveling &weathering
appearance
aging and oxidation
skid resistance
bleeding
temp base course cover
minor surface irregularities
ride quality
lane/shoulder demarcation
noise reduction
speed of construction
night work
splash & spray
Fog Rejuve
nator
Slurry
Chip Micr
osurfa
cing
Thin Overl
ay
BWC
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Treatment Selection
Pavement Age & Condition Climate Traffic – Current & Future Available Funding Agency Policy
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Surface treatments should be applied to a distress-free to moderately distressed pavement surface.
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Fog &
Rejuvenating Seals
Light Application of an Emulsion
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Fog & Rejuvenating Seals – Keys to Success
Materials Generally CSS-1h & SS-1h Proprietary for Rejuvenator
Site Conditions No Rain!
Pavement - 60ºF
Ambient - 50ºF
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Fog & Rejuvenating Seals – Keys to Success
A CLEAN Surface!
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Fog & Rejuvenating Seals – Keys to Success
Correct & Uniform Application Properly Functioning Equipment
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Slurry Seals & Microsurfacing
Asphalt Emulsion, Well-Graded Fine Aggregate, Additives
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Slurry Seals & Microsurfacing – Keys to Success
Materials Generally QS-1h, CQS-1h PMCQS (Microsurfacing) Clean, Angular & Durable Aggregate Mix Design
Surface Prep Remove Rubber Crack Sealant &
Thermo-place Markings Sweep or Pressure Wash
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Slurry Seals & Microsurfacing – Keys to Success
Site Conditions Ambient Temp - 50ºF Humidity ≤60% No Rain or Freezing Temps! No NIGHT work…unless Microsurfacing
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Slurry Seals & Microsurfacing – Keys to Success
Properly Calibrated Equipment
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Slurry Seals & Microsurfacing – Keys to Success
Pneumatic roller to limit stone loss
Sweeping to avoid windshield damage
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Chip Seals
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Chip Seal Variations
Single Double Triple (armor coat)
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Chip Seal Variations
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Cape Seal
Chip Seal Followed by Application of Slurry Seal
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Chip Seals – Keys to Success Binders Asphalt Cement Emulsion (RS-1, RS-2, CRS-2h) Modified (Polymer, Rubber)
Aggregates One Size Clean, Cubical and Durable Limit Flat & Elongated Particles
(~25%) Limit Fines (~ 1%)
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Gradation – 1 Size (semi-log scale)
Sieve Size Opening (inch)
Percent Passing
0
100
5
95
½ ¼
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Chip Seals – Keys to Success
Ambient Temp ≥ 55ºF Humidity ≤ 50%
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Chip Seals – Keys to Success
Broom Excess Aggregate
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HMA Asphalt Overlay of Polymer Modified Emulsion Membrane
Placed in a Single Pass Open to traffic in 15 to 30 minutes
Ultra-Thin Hot Mix Overlay – Bonded Wearing Course (BWC)
HMA
Emulsion Membrane
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Existing Pavement
¾- to 1-inch Typical Mix Thickness
Bonded Wearing Course
Emulsion membrane “wicks up” around the HMA aggregate.
The emulsion cures, bonding the mix to the existing pavement.
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BWC – Keys to Success
Gap-graded – Mountainous, Daily Freeze-Thaw Cycles
Open-graded – Frequent or Heavy Rainfall
US 50 Lake Tahoe
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BWC – Keys to Success
Max Size of Aggregate (Thickness ≥ 2-3X max aggregate size)
Sand Patch Test – Application Rate of Emulsion
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1 Month before Paving
Seal/Fill Cracks > ¼ - inch Fill Surface Irregularities Deeper than
1-inch with Dense-graded HMA
BWC – Keys to Success
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Sweep with Rotary Broom
BWC – Keys to Success
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BWC – Keys to Success Equipment Calibration
Spray Paver Spray Bar
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Damp, but Not Wet Surface Minimum Surface Temp – 60°F Minimum Ambient Temp
45°F to 50°F (binder dependent) 55°F for Open-graded and
Rubberized Mixes No freezing Temps within 24 Hours
BWC – Keys to Success
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Resources
http://pavementinteractive.org
http://fhwapap34.fhwa.dot.gov/NHI-PPTCG/index1.htm
http://www.nhi.fhwa.dot.gov/training
FHWA-NHI-131110 Pavement Preservation Treatment Construction
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http://www.fhwa.dot.gov/pavement/preservation/ppcl00.cfm
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Resources
http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_syn_342.pdf
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Resources
http://www.dot.ca.gov/hq/maint/MTA_GuideVolume1Flexible.html
http://www.bnibooks.com
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Condition of Existing Surface – Type and Severity of Distress
Material Selection & Mix Design Surface Prep – Crack Sealing/Filling,
Localized Patching, Clean Placement Conditions – Temp, Precip &
Humidity Equipment – Properly Functioning &
Properly Calibrated
Review Surface Treatments –
Keys to Success
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Questions?