The base layer (base course)
the base layer is the layer of pavement that lies between layers of sub-base and the surface layer, the base layer serves as: The pavement withstand the force of latitude of wheel load and spreading the load to the layer below. Bearing against the surface layer. The materials for the base course on this must be sufficiently strong and durable so it can withstand the load-bearing wheels. In determining the material base course is to consider several things, among others, the adequacy of local materials, pricing, volume of work and the distance transport of materials to field. Surface (Surface Course)
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