UNE-EN 772-4:1999 METHODS OF TEST FOR MASONRY UNITS - PART 4: DETERMINATION OF REAL AND BULK DENSITY AND OF TOTAL AND OPEN POROSITY FOR NATURAL STONE MASONRY UNITS
1999UNE-EN 772-4:1999 METHODS OF TEST FOR MASONRY UNITS - PART 4: DETERMINATION OF REAL AND BULK DENSITY AND OF TOTAL AND OPEN POROSITY FOR NATURAL STONE MASONRY UNITS