Full Depth Reclaimation & Soil Stabilization
General Construction & Long-Term Contracting
Cold In Place Asphalt Recycling
FULL DEPTH RECLAMATION is a rehabilitation technique that allows agencies to pulverize the full thickness of asphalt, or other road surface and a predetermined portion of the underlying materials (base, sub base, or sub grade) to uniformly blend and create a homogeneous construction material.
Prior to construction, the existing roadway is analyzed for current structural capacity and materials assessment, with core samples being extracted for laboratory analysis. These samples will aid designers and owners in determining which stabilizing additives are needed to optimize the quantity of stabilizing agent to be used and the physical properties of the reclaimed mix.
Using the results of the detailed laboratory analysis, the design engineer may choose one of the following stabilizing agents:
BITUMINOUS STABILIZATION - Contractors can inject either asphalt emulsion or foam/expanded asphalt directly into the cutter drum while the pulverizer is coupled to a nurse truck. This application is best suited for older oxidized asphalts, soil cement materials and clean granular/ bituminous structures. Expanded asphalt achieves very good success while utilizing liquid asphalt injection into granular mixes. Previously chip sealed or oiled roads can be reconstructed in situ to meet municipal needs/current loading requirements.
CHEMICAL STABILIZATION - The application of general use Portland cement blended with a variety of additives (Type C Fly Ash, Lime/Cement Kiln Dust) has gained rapid acceptance in rural areas to rework existing roadways to match the needs of resource industries and large scale farm operations. The chemical alteration of sub grade clay into a granular material that allows water to pass through provides a road base with minimal road user disruption. Completing these composite structures with a graded aggregate seal coat will keep costs down in rural areas. Calcium and Magnesium Chloride are also being reviewed for their application as chemical stabilizers.
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MECHANICAL STABILIZATION - Agencies have the ability to alter current roadway gradation matrices at minimal cost by pulverizing local aggregate/ Reclaimed Asphalt Pavement (RAP) or concrete rubble into the road to form a desired gradation and strengthen particle interlock.
Full Depth Reclamation will often require a combination of stabilizing agents to optimize the quantity of stabilizing agents to be consumed during construction and physical properties of the reclaimed mix. Regardless of which stabilizing agents are used, a laboratory mix design must be undertaken prior to construction to determine the best possible starting point and project outcome.