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Broad cement designations in BS 8500

BS 8500-1: 2019 Concrete - Complementary British Standard to BS EN 206 Table A.6 provides a list of cement and combination types. In this context, a cement is a factory produced Portland cement or a composite of Portland cement with an addition, and a combination is a blend of Portland cement with an addition batched at the concrete plant. These are prefixed with either CEM or C respectively. They are accompanied by roman numerals I, II, III or IV which categorise the cement/combination into broad groups. Apart from CEM I which is Portland cement, these categories are further sub-divided into A and B relating to the percentage of addition. For example, CEM II/A. This does not indicate the addition type, hence the following letter designations.

L = limestone powder
LL = limestone powder (higher purity with a low total organic content)
S = slag
V = fly ash
D = silica fume
P = natural pozzolana
Q = natural calcined pozzolana
M = ternary composition

Where the cement or combination complies with the requirements for sulfate resistance, +SR is also included.

Examples are;

CEM II/A-S Portland slag cement - CEM I with 6 to 20% addition of ggbs (S)

CEM II/B-V +SR Portland fly ash cement - CEM I with 21 to 35% addition of fly ash (V) complying with requirements for sulfate resistance.

CEM II/B-M(Q-L) Ternary blends of Portland cement (CEM I) with 6 to 29% addition of natural calcined pozzolana (Q) and limestone powder (L) where the limestone is limited to a maximum 20%.


Acknowledgement: The Concrete Society