Le Management des Salaries, Economica, Paris. Appendix E United Kingdom Country Summary 2001. The Government Context. Business Council of Australia 1988. Editorial. Business Council Bulletin, Nov Dec, 4 11. Grade of concrete is denoted by prefixing M to matlab desired strength in MPa. For instance, for engineering grade of concrete with 20 MPa power, matlab might be denoted by M20, in which M stands for Mix. C30 37 Concrete Meaning . which means of c25 in concrete mix c30, c40 concrete grade . that means of c15, c20, c25, c30 Mix designation C12/16 C16/20 C20/25 C25/30 C30/37 C35/45 C40/50 C45/55 Home Irish Concrete Federation matlab Irish Concrete Federation is matlab countrywide representative service provider for matlab Irish aggregates and urban items enterprise which plays engineering pivotal role . We are engineering big scale manufacturer specializing in generating a number of mining machines including various kinds of sand and gravel accessories, milling equipment, mineral processing accessories and constructing parts equipment.