Concrete Strength Class
Summary
Concrete Strength Class - The strength class of concrete defines the characteristic strength used in design calculations when designing concrete structural elements. Typically units are in Megapascal (MPa) or N/mm².
Technical Information
The strength class of the concrete can be influenced by a number of factors. These include:
- The water/cement ratio.
- Types of additives present in the cement e.g. PFA, SF, SP or GGBFS.
- The amount of additive present in the cement.
- The curing conditions of the concrete
In the Eurocodes, strength class of a concrete is written as CXX/YY. Where XX is the characteristic compressive strength of a cylindrical sample (fck) and YY is the characteristic compressive strength of a cubic sample (fcu). Both of these values are the 28 day strength of the concrete.
Related Definitions
Agitator Truck , Water to Cement Ratio , Admixture , Ground Granulated Blast Furnace Slag (GGBFS) , Wash Out TestResources
The Concrete Society: Technical Report 34; Chapter 6BS EN 1992-1:2004: Eurocode 2; Chapter 3 and 10.
O.Brooker: How to Design Concrete Structures using Eurocode 2; Chapter 3
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