pavement maintenance ii part 1a: surfacetreatments idaho roads scholar program
TRANSCRIPT
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Pavement Maintenance IIPart 1a: SurfaceTreatments
Idaho Roads Scholar Program
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Objective
Investigate types of surface treatments and where they are most beneficial.
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Surface Treatments:Purpose
Typically used to: Seal cracks Waterproof surface Improve friction Improve rideability Rejuvenate surface
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Candidate for…?
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Surface TreatmentsTypes
Fog Seal Slurry Seal Chip Seal Cape Seal Scrub Seal
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Light application of diluted, slow-setting asphalt emulsion without aggregate cover.
Description
Purpose Seal pavement Inhibit raveling Enrich
hardened/oxidized asphalt
Provide delineation with shoulder
Fog Seal
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Fog Seal Benefits
Seals small cracks & surface voids Prevents raveling of chip seals Prevents snow plow damage Darkens new chip seals
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Fog Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Feasible
Not Appropriate
FeasibilityFeasibility
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Fog Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Effective
Marginal
No Impact
EffectivenessEffectiveness
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Fog Seal A fog seal is one of our least expensive tools
to use and also one of our least used tools. It consists of the following steps: Clean the pavement surface. Then clean it again! Provide for traffic control. Spray the liquid asphalt. After allowing for cure time blot up any
puddling.
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Fog Seal
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Fog Seal
Most common product used: CSS-1 dilute
Cost for CSS-1 dilute in Boise: $112.00 per ton.
Cost to apply a fog seal: $0.10 to $0.20 per square yard
A maximum of a three year life
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Slurry Seal
Mixture of well-graded aggregate and slow setting asphalt emulsion
Description
Purpose Seal surface cracks. Correct raveling/oxidation. Fill minor surface irregularities and restore
friction.
• Good application to use in subdivisions where curb exposure is an issue.
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Slurry Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Feasible
Not Appropriate
FeasibilityFeasibility
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Slurry Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Effective
Marginal
No Impact
EffectivenessEffectiveness
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Slurry Seal
A slurry seal utilizes an emulsified asphalt and a small aggregate that is mixed through a mobile pug mill and then is squeegeed onto the pavement. It consists of the following steps:
Clean the pavement surface. Work is normally performed under
a road closure. Apply the slurry seal. Wait for cure time. (Usually
about???)
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Slurry Seal
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Slurry Seal
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Slurry Seal
Most common seal used: Type II (1/4-10) Cost to apply: $0.85-$1.20 per square
yard. Has an average of a five to ten year life. Should seal cracks prior to applying
slurry seal. Requires very clean rock.
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Chip Seal
Application of asphalt and aggregate chips rolled onto the pavement
Purpose Seal pavement Enrich hardened/oxidized asphalt Retard reflection cracking on HMA
overlays Improve surface friction
Description
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Chip Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Feasible
Not Appropriate
FeasibilityFeasibility
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Chip Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Effective
Marginal
No Impact
EffectivenessEffectiveness
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Chip Seal A Chip Seal provides a little heavier seal
and consists of a spray applied liquid asphalt and then rock added to it. A typical Chip Seal consists of the following steps:
Clean the pavement surface. Provide for traffic control. Spray the liquid asphalt. Apply the rock into the asphalt Roll with pneumatic rollers. Sweep loose rock up.
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Chip Seal
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Chip Seal
Most common product used: Polymer modified emulsion.
Cost for emulsion in Boise: $160.00 per ton.
Cost to apply a chip seal: $0.90 to $1.40 per yard.
A typical life of 7 to 12 years.
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Chip Seals--Rules of Thumb Don’t use on bleeding or rutted
pavements Pre-fog seal any new patches Use clean chips Wait for warm weather (>70ºF) Spread chips immediately behind
emulsion spray Roll slowly (walking speed) with
rubber roller
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Cape Seal
Combination of a chip seal, a slurry seal and usually a crack seal application.
Good process to use where curb exposure is a concern.
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Cape Seal
Clark Co 1993
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Macro Sealing
Application of asphalt and aggregate chips rolled onto the pavement
Single machine applied Eliminates distance between
distributor and chip spreader Same results as a chip seal
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Macro Surfacing
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Scrub Seal
Application of sand or small-sized aggregate on broomed layer of polymer-modified asphalt
Purpose Fill and seal small cracks and voids Enrich hardened/oxidized asphalt Preparation for another treatment
Description
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Scrub Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Feasible
Not Appropriate
FeasibilityFeasibility
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Scrub Seal
Distress TypeFatigue Cracking
Linear & Block Cracking“Stable” Rutting
RavelingFlushing/Bleeding
RoughnessFriction Loss
Moisture DamageShoving
Extent of ProblemMinor Major
Effective
Marginal
No Impact
EffectivenessEffectiveness
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Scrub Seal
Developed by ADOT Designed to “arrest light
deterioration” Fills cracks without the labor
intensive work Rejuvenates properties of the old
asphalt lost due to oxidation
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Scrub Seal - How to apply
Asphalt agent applied by distributor Scrubbed into the cracks & surface Sand is then applied over asphalt
and scrubbed into cracks & surface again.
Rolled with a pneumatic roller Traffic removes excess sand Road opened in about 2 hours
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Review
Investigate types of surface treatments and where they are most beneficial.
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Surface Treatments Types - Review
Fog Seal Slurry Seal Chip Seal Cape Seal Scrub Seal
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Review cont. 2 layers of rock on layer of asphalt 60% - 70% aggregate coverage Adjust for existing pavement
condition Go lighter on new AC patches Take time to calibrate Binder protects road - Chips
protect the binder Cubicle chips better than flat chips Always have clean surface / Equip.
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Questions?
Surface
Treatments