Granular Sub Base (GSB)

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Well graded unbound material, usually crushed stone, crushed slag, crushed concrete or another inert hard material. The most common unbound granular sub base material used to form a path base is Type 1. It is now possible for granular sub base to be a recycled aggregate, providing it meets set aggregate quality standards criteria.

type 1_2recycled_type1_crushed_concrete

Crushed stone                                                                   Crushed concrete

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