Chisel is an aggregate form used in the construction of terraces and sidewalks whose upper layers consist of mortar guides (or "dry" footholds). The first layer in such surface construction is called a subgrade - this is the original material layer beneath the intended surface. Usually compacted and stabilized. If the final pavement is to have vehicular traffic, the subbase layer of rock or crushed concrete should come next - this layer will even come out of the ground base and will bear the heaviest burden of the pavement above. Next is the base class (also called the aggregate base course or ABC) consisting of crushed gravel that varies from 0.75 inches (1.9 cm) to the size of the dust particles. It is also usually compacted and likened. The next layer will be the base of the paver, consisting of coarse sand and usually between 6 in (15 cm) and 12 in (30 cm) thick, depending on anticipated traffic. Pavers then put on top of this, and then sand uniform, fine grains poured between them.
Video Paver base
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Source of the article : Wikipedia
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