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Aggregates are major constituents in construction, the global demand for which approaches some 22 billion tonnes per year. Some major challenges follow: firstly, the dependency on geological conditions and the availability of resources; secondly, the traffic, emissions and energy use connected with transportation; thirdly, the technology of utilizing resources with a variety of properties to meet user requirements; and finally, the need for increased awareness, particularly over issues like land-use conflicts, environmental impact of the aggregate and quarrying industry, and the need to make these activities sustainable.

Aggregate standards have primarily been written by engineers, and engineers are first...

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