Preservation

Paver Placed Surface Treatment (PPST)

What
  • Conventional: The application involves a self-priming paver, which applies an emulsion bond coat directly in front of the paving screed where an ultra-thin overlay of hot mix asphalt is placed.
  • Modified: The application involves a self-priming paver, which applies an emulsion bond coat directly in front of the paving screed where an ultra-thin overlay of hot mix asphalt is placed.
  • Type A: 1/4" maximum aggregate size mix.
  • Type B: 3/8" maximum aggregate size mix.
  • Type C: 1/2" maximum aggregate size mix.
When
  • Appropriate when a new hot mix wearing course is needed.
  • Ideal for roads with no structural improvement required.
  • When there are issues with friction or pavement slip at intersections or on hills.
Why
  • Provides the durability of hot mix with a much stronger bond than traditional tack coats.
  • Improves rideability, allows for minor adjustment of cross slope and elevation, and results in minimal loss of curb reveal.
  • Results in a higher friction wearing course than traditional hot mix and eliminates hydroplaning.
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FiberMat®

What
  • Type A: A combination of polymer-modified asphalt emulsion, chopped glass fiber strands, and aggregate as a fiber-reinforced stress absorbing surface course.
  • Type B: A combination of polymer-modified asphalt emulsion, chopped glass fiber strands, and aggregate as a fiber-reinforced Stress Absorbing Membrane Interlayer (SAMI).
When
  • For use when it becomes necessary to absorb movements in poor pavement surface structure and prevent the pavement from cracking further.
  • To correct raveling and oxidation issues of existing pavements in good condition.
  • When used as an interlayer, to enhance performance of top wearing course.
Why
  • Stretches maintenance dollars by repairing and significantly delaying cracking.
  • Prevents water intrusion.
  • Enhances the tensile strength and fatigue performance by 30%.
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Microsurfacing & Slurry Seal

What
  • Microsurfacing: A treatment, placed on a continuous basis, that consists of applying a proportioned mixture of polymer modified asphalt emulsion, aggregate, mineral filler, fiberglass strands, water and other additives to a paved surface in a single lift.
  • Slurry Seal: A treatment, placed on a continuous basis, that consists of applying a proportioned mixture of asphalt emulsion, aggregate, mineral filler fiberglass strands, and water to a paved surface in a single lift
When
  • For roads that exhibit low severity cracking, raveling, and oxidation.
  • Ideal for sealing and filling voids in the existing surface while improving skid numbers.
  • Used for correcting mild rutting without additional crowning or surface buildup.
Why
  • Maintains minimal change to pavement elevation and curb reveal.
  • Offers superior adhesion to existing pavements.
  • Highly skid resistant.
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Chip Seal

What
  • Single Chip Seal: A thin preventive maintenance overlay consisting of a heavy spray application of asphalt emulsion followed by a single layer of clean, uniform sized crushed stone.
  • Double Chip Seal: Two layers of single chip seal applied one immediately after another.
When
  • When necessary to provide a skid resistant wearing course with a minimal change to pavement elevation.
  • For roadways showing early signs of deterioration with low severity cracking, raveling, or rutting.
  • To correct oxidation issues of existing pavements in good condition.
Why
  • Seals the pavement from intrusion of water and reduces oxidation and weathering of the surface.
  • Most cost-effective method to address raveling, correct bleeding and flushing problems, improve skid resistance, and generally extend the pavement life.
  • Double seals provide a strong solution for a distressed pavement in lieu of removing and replacing.
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Cape Seal

What
  • A two-part process consisting of a chip seal followed by a microsurfacing or slurry seal wearing course.
When
  • May be used on pavements that are too deteriorated to use a chip seal, microsurfacing, or a slurry seal alone.
  • When low severity cracking and minor wheel rutting are present, even in heavy traffic areas.
  • Ideal in locations where a double surface treatment is needed, but loose stone is unacceptable.
Why
  • Cracks are sealed, drastically reducing the intrusion of water into the pavement structure.
  • With the addition of the top treatment, a slurry seal or microsurfacing, the road ends up with a smooth surface that binds any loose aggregate, reducing stone loss.
  • Addressing both preventative maintenance and rehabilitation needs, cape seals combine the benefits of both a microsurfacing/slurry surfacing system and a chip seal, which enables them to provide more protection and durability as compared to that of other preventative measures alone.

Crack Seal

What
  • A preventative maintenance treatment that uses high quality rubberized material to increases pavement life at a minimal cost by keeping water out of cracks and penetrating pavement structure.
When
  • For roads showing early signs of deterioration
  • For use on roads that are in good structural condition but exhibit single, well-defined cracks
  • For preparing roads prior to new surface treatments
Why
  • Increases pavement life at a minimal cost
  • Prevents water intrusion, sub-surface ice formation, and structural failure of roadway
  • Reduces formation of secondary cracking, rutting, and pothole formation
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Mastic Crack Seal

What
  • Hot applied pourable, aggregate-filled, flexible, self-adhesive patching material.
  • Used for maintenance and repair of asphalt and concrete pavements.
When
  • Distresses that are too large for crack sealing but too small for complete road reconstruction.
  • Wide cracks, longitudinal and transverse cracks.
  • Potholes, Joint Failures, Bridge Decks, Manhole leveling.
Why
  • Flexible, Durable, Highly adhesive .
  • Best option for treatments too extensive for crack sealing.
  • Waterproof and voidless repair.

Fog Seal

What
  • An inexpensive, cost effective pavement preservation treatment where a light application of diluted emulsion is applied to pavement surfaces which slows caused by environmental factors such as sunlight and thermal variations.
When
  • For use on pavements that are oxidized and in need of rejuvenation.
  • Ideal for sealing a new chip seal, FiberMat®, CIPR, or cold mix paving project.
  • Recommended as a pretreatment for porous surfaces that need to be prepared for an overlay.
Why
  • Fog sealed surfaces will add aesthetics, alleviate raveling, and seal minor cracks.
  • Fog sealing promotes adhesion as a pretreatment on all pavements.
  • Slows the deterioration of pavement surfaces caused by environmental factors such as sunlight and thermal variations.

Cold Mix Paving

What
A mixture of aggregates and emulsion, blended and placed in one continuous operation using a mix paver or pugmill blended on site then placed in a conventional paver.
When
  • Ideal when a flexible pavement is needed for substandard sub-bases.
  • To be used as an economical option for a shim paving course prior to a wearing course.
  • For older roads that need rebuilding from the sub-base up.
Why
  • Crack and rut resistant.
  • Strength is comparable to hot mix asphalt.
  • Durability and flexibility exceed that of conventional hot mix asphalt.
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