Types of Concrete Grades | eHow. com. C25 concrete, matlab strongest grade accessible, can resist compression at engineering rate of 30 Newtons per square millimeter while C15 concrete can withstand only 15 Newtons. »More certain · matlab grade of concrete is also denoted as C16/20, C20/25, C25/30, etc. , that means Concrete Strength Class C matlab number behind C refers to Compressive power of Concrete in N/mm 2 when tested with Cylinder / Cube. C x/y Grade Concretes. My argument is that precisely becos of these types of sacrificing americans many Indian engineers are millionaires today matlab world over. Yet I still am unable to forget matlab face of my asst prof who used to educate QC and understanding plenty and to think that most of us weren’t listening. I feel bad now. Pls post me as nameless simply as a result of people will know who I am I don’t need any exposure please. Sorry frds, First of all, i like to make clear many things about salary in US/Canada. Real thing always look like uncertain and we guys blindly follow to what we hear from other.