http://www.cement.ca/cement.nsf/e/4366443DA425F3C3852568A8007B9157?OpenDocument 
 Most general-use concrete has a compressive strength between 20 and 35 MPa. High-strength concrete by definition, has a compressive strength of at least 70 MPa. Compressive strengths up to 140 MPa have been used in special bridge and high-rise building applications.