Ohorongo Cement Product Types

CEM I 42.5R

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.

CEM II B-LL 32.5N

Used by retailers, small construction companies and common applications around the house (plastering and small renovations).

CEM II A-LL 42.5N

Used by batching plants for a high range of ready-mix concrete.

CEM II B-V 42.5N

Ideal for use at the coast, higher resistance against moisture penetration and chloride enriched environment (sea water).

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).

1.  “N” stands for ordinary (normal) early strength
2. “R” stands for high (rapid) early strength

The parameters for these classifications are determined in the SABS SANS 50197-1 and NAMS 197-1.

Aggregate

Sand

Water

Quality of water is important!

Curing

Ohorongo Cement is distributed in 50 kg bags, 2 ton bags and bulk tankers. Bulk storage silos should be dry and vapor tight. Cement bags should be protected from moisture and kept dry, preferably off ground by means of pallets or timber, preventing moisture contact. Bags should be stored away from direct sunlight, or should be covered by a roof or sheeting. Stacking should be kept to a maximum of two pallets high to avoid compaction of cement bags at the bottom.

Refer to Ohorongo Cement Safety Data Sheet, obtainable from Ohorongo Cement.

Ohorongo Cement offers technical support from its comprehensively equipped chemical, cement, and concrete laboratories. Assistance with cement- as well as concrete aspects, including advice on mix design is available from our qualified technical staff.

Cement Plant
Sargberg Plant, North Otavi
PO Box 444, Tsumeb
Tel: +264 67 235 7000
Fax: +264 67 235 7070

Please contact the Ohorongo Cement Sales Office for price enquiries. Contact details provided below.

CONTACT

Ohorongo Haus
Schanzenweg 35, Windhoek
PO Box 86842, Eros Windhoek 
Tel: +264 61 389 300
Fax: +264 61 247 878