subbase course

subbase course

For the support of paving materials, a layer of granular material applied to the subgrade in a predetermined depth; provides underpavement drainage and reduces frost damage.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
These allow semicoke to have potential applications as aggregate of cement-stabilized road base or subbase course construction, and oil shale semicoke would be utilized in large quantities.
DeGroot, "Structural numbers for reclaimed asphalt pavement base and subbase course mixes," Transportation Research Record: Journal of the Transportation Research Board, vol.
Ragab estimates that a machine control-equipped grader can achieve volumes of 3,000m3 per day on a subbase course, while Othman notes: "A grader normally goes up to around 1,700m3 or 1,800m3 per day - mainly because the operator needs to repeatedly make sure they are doing the bed correctly.