NF P18-622-7*NF EN 933-7:1998 Tests for geometrical properties of aggregates - Part 7 : determination of shell content - Percentage of shells in coarse aggregates
1998NF P18-622-7*NF EN 933-7:1998 Tests for geometrical properties of aggregates - Part 7 : determination of shell content - Percentage of shells in coarse aggregates