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ÖNORM EN 772-2:2005-05

Действует
Methods of test for masonry units - Part 2: Determination of percentage area of voids in masonry units (by paper indentation) (consolidated version)
This European Standard specifies a method of determining the percentage area of voids in masonry units.
Diese Europäische Norm legt ein Verfahren zur Bestimmung des prozentualen Lochanteils in Mauersteinen
fest.
ICS
91.100.30 Concrete. Including admixtures / Бетон и изделия из бетона