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ONORM EN 771-3:2011
Specification for masonry units - Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates) (Austrian Standard)
This European Standard specifies the characteristics and performance requirements of aggregate concrete masonry units made from dense and lightweight aggregates or a combination of both for which the main intended uses are common, facing or exposed masonry in load bearing or non load bearing building and civil engineering applications.
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Austrian Standards Institute [on]