Aggregates are of two main types – crushed rock and sand and gravel. Some examples of their use include hard-core for use under concrete slabs and footpaths, infill for roads and drainage stone on farms. In addition aggregates are a key ingredient in the manufacture of ready-mixed concrete and precast concrete products.
European product standards (ENs) have been developed for the production of aggregates by the European body, CEN. These product standards have been adopted for use in CEN member states, including Ireland. The standards for aggregates, which are all available for purchase from the N.S.A.I, include the following;