
- CEM I 42.5R
- CEM II B-LL 32.5N
- CEM II A-LL 42.5N
- CEM II B-V 42.5N
![]() | Used by Brickmakers due to the high early strength. Also used for “special blended mixes’’ where other cementitious additives should be added to obtain prescribed properties. |
![]() | Used by retailers, small construction companies and common applications around the house (plastering and small renovations). |
![]() | Used by batching plants for a high range of ready-mix concrete. |
![]() | Ideal for use at the coast, higher resistance against moisture penetration and chloride enriched environment (sea water). |
INDICATORS ON OHORONGO CEMENT
The description of the different cement types is made up of different sections:
- CEM I = Portland cement
- CEM II = Portland composite cement
The type of constituent is indicated by the following abbreviations/letters:
“V” – Siliceous Fly-Ash
“L” – Limestone with only up to 5% organic material
(Low grade)
“LL” – Limestone with only up to 2% organic material
(High grade)
SECTION 3
Indicates the compressive strength of the cement in MPa after 28 days. The three strength categories are 32.5, 42.5 and 52.5.
SECTION 4
Indicates which early strength the cement has. There are three different types of early strengths, L, N & R; however only two are used in Southern Africa (N & R).
- “N” stands for ordinary (normal) early strength
- “R” stands for high (rapid) early strength
The parameters for these classifications are determined in the SABS SANS 50197-1 and NAMS 197-1.
ENVIRONMENT
OTHER IMPORTANT FACTORS
Aggregate
Sand
Water
Quality of water is important!