The guide contains advice on the selection, testing and specification of crushed rock and naturally occuring granular materials for use in pavement base and subbase construction. this includes natural gravels/sand clay/soft and fissile rock, which do not require costly extraction or crushing processes. They are an important source of material used in the pavement (base and subbase) and shoulder construction of flexible pavements in Australia. Crushed rock, which is produced by the crushing and screening of hard source rock (igneous, metamorphic or sedimentary rock), which would typically need to be excavated by the use of explosives and river gravels. It is used in the pavement (base and subbase) and shoulder construction of flexible pavements.

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RF.7