Pavement Recycling Using a Heavy Bulldozer Mounted Pulverizer.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
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Recycling of paving materials is gaining acceptance as a means of savings in pavement reconstruction or rehabilitation. The need to conserve natural resources and increasing costs of select virgin materials have 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. CRREL 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 street pavement in Hanover, N.H., and highway pavement test sections at a CRREL test facility. IThe resultant processed material met 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 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.
- Snow, Ice and Permafrost
- Civil Engineering