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Process, Critical Factors, Benefits & Results of
FOAMED ASPHALT PAVING
A publication of
Foam asphalt injection is a technique that while used throughout Europe, has not been widely used in the United States. The process refers to liquid asphalt oil that is foamed into the form of bubbles and used to rehabilitate pavement as a stabilization agent.
By injecting cold water together with the superheated hot asphalt, the water temperature rises and becomes steam. When the asphalt and steam are injected into ambient air, the asphalt temporarily expands into bubbles which greatly increases the surface area.
In partnership with Tri-County Paving, Wolf Paving completed the first foam asphalt injection project in Waukesha County.
Waukesha Co. Road Program New Berlin, WI
Want to steam-roll ahead? Here’s what we’re going to cover.
DETAILS & PROCESS STEPS4 … Pulverization5 … Shaping6 … Mixing7 … Compaction8 … Details
CRITICAL FACTORS11 … EnvironmentalWater, Temperature, Transportation
BENEFITS & RESULTS12 … Foamed vs. Traditional 13 … Results14. … About Wolf Paving
Steps To Foam Asphalt Stabilization
Pulverization Of The Existing Road Surface1
Steps To Foam Asphalt Stabilization
Shaping the Surface to Near Final Grade2
Steps To Foam Asphalt Stabilization
Mixing and Injection of Foamed Asphalt Cement3
Steps To Foam Asphalt Stabilization
Compaction to Final Grade4
The foamed asphalt process aligns with
the forceful expansion of
asphalt cement.
The foamed asphalt process aligns with
the forceful expansion of
asphalt cement.
Hot reaction is similar to adding water to hot oil in a traditional paving process. In a foamed process, the
reaction is controlled.
After the mixing process, a padfoot
roller is used for initial compaction,
a rubber tired roller is used as the
breakdown roller, followed by a
steel drum roller as the finish
roller.
CRITICAL FACTORS
Weather & Site Conditions Too dry = hinders foaming process Too wet = foam clings to itself rather than aggregates in the pulverized base
Quantity of WaterA substantial amount of water is needed during the injection and final grading process.
TransportationTransportation for water and materials as well as the equipment train throughout the project require significant space – which works for roadways but poses a challenge for parking lots
Temperature of Oi lThe ideal temperature for the hot oil is 340 degrees. Hotter oil may coke-up or ash slightly. Cooler oil hinders the production of foam.
BENEFITS
Roads open to traffic faster.
Roads open to traffic faster.
Deeper road stabilization
(up to 14 inches)
Deeper road stabilization
(up to 14 inches)
Foamed Asphalt vs. Traditional Techniques
Material can be stockpiled for a longer period of
time.
Material can be stockpiled for a longer period of
time.
A cost effective solution to strengthen road base.
ABOUT Wolf Paving is a third-generation family-owned business with various locations throughout South East Wisconsin. By controlling the raw ingredients, Wolf Paving can produce any type of asphalt mix to handle unique challenges — whether it’s steep hills where cracking can be a problem, or a flat driveway, Wolf Paving builds asphalt solutions designed to look better and last longer.
With a long professional history, the experts at Wolf Paving are experienced and trained to handle virtually any paving project of any size, whether it is residential, commercial or municipal. We meet all your asphalt needs from driveways to highways.