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Base course

Lower surfacing layer formed by bituminous mixtures. When the surfacing has a thickness of more than 8 cm it is usually made in two layers, wearing course (upper) and base course (lower). The base course does not have to exist and, in this case, the surfacing would only be made up of the wearing course, having both of them different composition. An adhesive spray made from a bituminous emulsion is applied between the base course and the wearing course.

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