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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

aggregate size

Language : PIARC Road Dictionary / English
Theme : Roads Materials Soils and Aggregates
Definition : Designation of aggregate in terms of lower (d) and upper (D) sieve sizes (in mm). Note: this designation accepts the presence of some particles which will be retained on the upper sieve (''oversize'') and some which will pass the lower sieve (''undersize'') [CEN].

Korngruppe

Language : PIARC Road Dictionary / German
Theme : Straßen Baustoffe Erdreich und Gesteinskörnung
Definition : Bezeichnung von Mineralstoffen in Form von unterer (d) und oberer (D) Korngröße (in mm) -- diese Bezeichnung nimmt die Anwesenheit einiger Körner hin, die auf dem oberen Sieb liegen bleiben ("Überkorn") und einige die durch das untere Sieb fallen ("Überkorn") (CEN).