Methods of test for masonry units - Part 20: Determination of flatness of faces of aggregate concrete, manufactured stone and natural stone masonry units; German version EN 772-20:2000— 4 стр.
91.100.30 Concrete. Including admixtures / Бетон и изделия из бетона
91.100.15 Mineral. Including earth, sands, clay, slates, stones, etc. / Минеральные материалы и изделия. Включая землю, песок, глину, шифер, камень, кирпич и т.д.
