NF P12-102*NF EN 772-2:1999 Methods of test for masonry units - Part 2 : determination of percentage area of voids in aggregate concrete masonry units (by paper indentation)
1999NF P12-102*NF EN 772-2:1999 Methods of test for masonry units - Part 2 : determination of percentage area of voids in aggregate concrete masonry units (by paper indentation)