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home > pervious surfaces > structural performance > specification of aggregates
The aggregates used in the sub-base below pervious surfaces must consider the presence of water on the materials and the need to transmit water. Guidance includes advice on:
These requirements are met by specifying appropriate values for ten per cent
fines values, Los Angeles Abrasion Tests values and also by specifying the
types of rock that can be used for aggregate.
It is important when specifying granular materials to ensure that they can
be easily, economically and sustainably produced. The use of commonly available
coarse crushed rock aggregates will ensure that pervious surfaces can be constructed
economically.