CEM II A-LL 42.5N

Ohorongo CEM II A-LL 42.5N offers a range of extra benefits for concrete and mortar work, making it an ideal choice for both small and large projects.

Freshly mixed concrete

•  Improved water retention and less bleeding for better surface finish
• Allows earlier stripping times

Concrete in the hardened state

• Wide range of concrete strength can be reached
• Excellent 7-day strength development
• Consistent high quality
• Low to moderate heat of hydration
• Reduced expansion
• Higher long-term strength and durability
• Denser concrete which leads to lower permeability

Ohorongo CEM II A-LL 42.5N is a Portland Composite Cement comprising of high quality clinker blended with gypsum and high grade limestone.

Strength Development

Ohorongo Cement is ISO 14001:2015 certified, confirming its commitment towards sustainability and caring for the environment. Ohorongo has replaced over 40% of its fossil fuel with locally sourced environmentally friendly fuels such as wood chips and charcoal fines to reduce the carbon footprint of its production process.

Water consumption is minimised by using air for clinker cooling. Advanced filtration systems are installed accross the entire process to limit dust emissions.

Recommended mix proportions by volume using CEM II A-LL 42.5N

Aggregate
Aggregate have a significant influence on strength, quality and durability of concrete, mortar and plaster. We recommend using aggregates from reputable suppliers.

Sand
The sand used should not contain organic material (dung, roots, leaves), nor too much fines / clay, which may lead to loss of strength or excessive water demand.

Water
Quality of water is important! Use clean drinkable water to achieve a workable concrete. Least amount of water should be used, too much water will result in strength loss of concrete, plaster and mortar.

Curing
After the concrete, mortar and plaster have hardened, keep them moist by spraying with water and covering with light coloured plastic sheeting to prevent evaporation for up to 7 days.

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

If you are a redistibutor of Ohorongo Cement and need high resolution images for your promotional material, files in various formats may be found in the Ohorongo Cement Media Library.