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resources & tools

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 co...

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Concrete test cube manufacturing and curing procedures

Concrete test cube manufacturing and curing procedures

The strength of concrete is generally measured by testing concrete cubes which are prepared from the concrete used in that particular construction. The cube strength of concrete is specifi ed by...

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Your guide to concreting made easy with Ohorongo Cement

If the product comes into contact with the eyes, immediately wash out thoroughly with water and medical advise should be sought. Always wear protective clothing to prevent skin irritation or caustic burning, which may result from prolonged contact with cement. ...

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Plastering made easy with Ohorongo Cement.

If the product comes into contact with the eyes, immediately wash out thoroughly with water and medical advise should be sought. Always wear protective clothing to prevent skin irritation or caustic burning, which may result from prolonged contact with cement. ...

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Brick and Block Making made easy with Ohorongo Cement

If the product comes into contact with the eyes, immediately wash out thoroughly with water and medical advise should be sought. Always wear protective clothing to prevent skin irritation or caustic burning, which may result from prolonged contact with cement. ...

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Bricklaying made easy with Ohorongo Cement

If the product comes into contact with the eyes, immediately wash out thoroughly with water and medical advise should be sought. Always wear protective clothing to prevent skin irritation or caustic burning, which may result from prolonged contact with cement. ...

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Schematic of cement production process

Schematic of cement production process

This is a schematic presentation of the whole cement manufacturing process. Raw materials such as limestone, shale and marl are collected at the quarry and transported to the crush...

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Honeycombing in concrete

Honeycombing in concrete

Honeycombing is a term used to describe the hollow spaces and cavities; or the rough, pitted appearance on the concrete surface or inside the concrete mass, resulting from the mortar not adequat...

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Types of cracks in concrete

Types of cracks in concrete

Click on the link below to download the informative types of cracks in concrete document.

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Proper concrete curing

Proper concrete curing

Proper concrete curing is achieved when appropriate moisture & temperature conditions are maintained to permit continuation of the hydration reaction.   Click on the link b...

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Cracking of hardened concrete

Cracking of hardened concrete

When working with concrete, the ease of placement is of great importance, and therefore adequate workability and consolidation of concrete often results in more water being added than needed for...

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Understanding early age concrete cracking

Understanding early age concrete cracking

Causes of cracking It has long been recognized that the main reason for concrete cracking or delamination in reinforced concrete structures is due to the stresses caused by restrained shrink...

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Storing of cement bags with Ohorongo Cement

Storing of cement bags with Ohorongo Cement

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, preferabl...

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The Sunshine Club visits Ohorongo Cement

The Sunshine Club, a Television Program aired on NBC, recently took a closer look at Otavi and Namibia’s only cement producing plan – Ohorongo Cement. Construction of the Ohorongo Cement Plant started in 2009 with first production in 2011, making Ohorongo one of...

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Concrete Properties

Concrete Properties

The sub-processes of mixing, transport, moulding and compaction determine the key requirements for the concrete mix and fresh concrete. Workability is not defined in physical terms and canno...

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Casting Concrete at high temperatures

Casting concrete at high temperatures causes early setting, shorter workability and reduction of final strength of the product. Casting, compaction and surface treatment must be executed as fast as possible. Aside of the high temperature, also low relative air humidity (und...

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CEM I 52.5N

CEM I 52.5N

CEM I 52.5N Portland Cement is a hydraulic binder according to SANS 50197. The main component is Portland cement clinker, finely ground together with calcium sulphate, which controls the set...

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CEM II B-V 42.5N

CEM II B-V 42.5N

CEM II B-V 42.5N Portland Fly Ash Cement is a dry powder blend of OHORONGO hydraulic portland cement pozzolanic siliceous Fly Ash according to SANS 50197. The OHORONGO Portland Cement clink...

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CEM II A-LL 42.5N

CEM II A-LL 42.5N

CEM II A-LL 42.5N Portland Limestone Cement is a hydraulic binder according to SANS 50197. The main component is Portland cement clinker finely ground together with high quality limestone and ca...

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CEM II B-LL 32.5N

CEM II B-LL 32.5N

CEM II B-LL 32.5N Portland Limestone Cement is hydraulic binder according to SANS 5097. The main component is Portland cement clinker, finely ground together with high quality limestone and ...

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About Us

Ohorongo (Pty) Ltd. is Namibia’s only cement-producing company and owns one of the most modern cement plants in Africa. It was constructed over the course of two years by leading international engineering com...

Our Contacts

Ohorongo Haus
Schanzenweg 35, Klein Windhoek
P.O. Box 86842, Eros
Tel: +264 61 389 300

Cement Plant
Sargberg Plant, North Otavi
P.O.Box 444, Tsumeb
Tel: +264 67 235 7000



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