Asphalt Foaming occurs when small amounts of water come in contact with hot asphalt. This thermal reaction increases the surface area of the asphalt, thus decreasing its viscosity. Each tiny foam bubble is a carrier of a thin film of asphalt. The small amount of water will evaporate off immediately after reaction and not become part of the asphalt. The tiny particles of bitumen disbursed by the foam bubbles adhere to the finer gradings producing an asphalt-enhanced filler that acts as a mortar or mastic to bind the larger gradings together.

Foam asphalt stabilized material can be placed, shaped, compacted and open to traffic immediately after mixing and remains workable for extended periods of time. Stockpiling and delayed placement is possible requiring only moisture conditioning to aid in compaction.

Materials to be treated must have sufficient fines to allow for proper dispersal of the foamed asphalt. Foamed asphalt is yet again another great option for major arterials and highways.