1. Aggregate production
Natural aggregates are produced in quarries (figures 1 and 2 ), each of which represents a temporary occupation of the land, a parenthesis in the history of the site.
Aggregates are granular materials up to 125 mm in size, plus rockfill larger than 125 mm but weighing 15 tonnes or less. They are designated by their smallest and largest dimensions d and D, the interval d/D being called granular class. This designation admits that some elements can be retained on a square-meshed sieve of aperture D (D sieve) and that others can pass through the d sieve, within the standardized limits...
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Aggregate production
Environmental protection
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