Grade of concrete By Noel Mades Posted on February 12, 2018 In No Comments The term grade refers to the strength or the compression capacity of the concrete after it has aged 28 days. Normally, middle east’s symbol is C followed by numbers. About the Author Noel My Other Posts Hi! I am Noel Mades. I am the author of this site. Welcome, and thank you for visiting my site. Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed.