base course material
material used as a foundation, as for a road, before the finishing or sealing surface is applied.
Australian English dictionary. 2014.
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Base course — in pavements refers to the sub layer material of an asphalt roadway and is placed directly on top of the undisturbed soil so as to provide a foundation to support the top layer(s) of the pavement. Generally consisting of a specific type of… … Wikipedia
base course — noun Etymology: base (III) 1. a. : the first or lowest course of a wall (as of a foundation wall or of the wall of a building above the basement) b. : the bottom layer of material laid down in the construction of a pavement … Useful english dictionary
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