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|Title:||Pavement recycling using a heavy bulldozer mounted pulverizer|
|Authors:||Eaton, Robert A.|
Garfield, Donald E.
|Publisher:||Cold Regions Research and Engineering Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 77-30.|
Abstract: Recycling of paving materials is currently gaining acceptance as a means of economic savings in pavement reconstruction or rehabilitation. The need to conserve natural resources and increasing costs of select virgin materials has made recycling pavements economically attractive. Pavements that currently have low serviceability indices due to surface irregularities such as cracks, bumps, spalling, potholes, etc., may be broken up to meet specified granular base course gradation requirements and reused as a base for the new surface. The U.S. Army Cold Regions Research and Engineering Laboratory developed a permafrost excavating attachment for heavy bulldozers and a prototype test rig was constructed. Tests were conducted on frozen soils, gravels, and ledge. In September 1976, this rig was used to pulverize a flexible pavement on North Main Street in Hanover, N.H., and highway pavement test sections in a CRREL test facility. The resultant processed material did meet Corps of Engineers base course gradation requirements. The machine can process 120 square ft of pavement structure per minute to a depth of 12 inches. The most uniformly graded material was obtained at a drum speed of 15 revolutions per minute. Once the pavement structure is broken down from the solid mass (asphalt concrete pavement), the machine does not further break down or pulverize the aggregate. A minor amount of dust was evident during the operations, but no refinements are recommended as it was an insignificant amount.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Special Report|
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|SR-77-30.pdf||14.19 MB||Adobe PDF|