(CLASSIFIED)

Ranked among the world’s best fly ash for its consistent size, low LOI value and highly reactive chemical properties, DuraPozz® is the highest volume selling classified fly ash in South Africa for use in cement manufacturing and by the concrete industry.

DuraPozz® has a mean particle size of 25 micron, and complying to specification requirements, typically 90% of the product’s particles pass through a 45 micron sieve. In comparison the typical particle size distribution of general purpose cement ranges up to 100 micron with a mean particle size of 35 micron.

 
CLASSIFIED Carbon lean D50 fly ash

With the recent commissioning of a new state-of-the-art classifier at our Matla production site and with close consultation and support from Eskom we are now offering the cement and concrete industry DuraPozz®Pro^TM, a premium classified fly ash product.

Applying our extensive research into the performance of super-fine fly ash (SuperPozz®) in concrete, we have enhanced the properties of DuraPozz® even further. Where value engineering concrete performance and durability are the key requirements, DuraPozz®Pro^TM offers:

• Higher reactivity from a greater concentration of the amorphous (glass) phase, leading to higher ultimate concrete strengths
• Increased fineness and particle surface area from the additional fraction of fine spheres passing a 45 micron sieve
• Lower residual carbon, giving a whiter fly ash plus less activated carbon, which can adversely adsorb superplasticisers and other concrete admixtures
• Reduced water requirement promoting stronger concrete
• Improved workability
• The potential for further fly ash extension of cements and concrete
• Enhanced concrete resistance to chloride ingress, sulphate and alkaline-silica reaction
• Low heat of hydration in mass concrete pours
• Increased strength gain in concrete after 28 days

(CLASSIFIED)

SuperPozz® is designed to meet the needs for an ultra or super-fine fly ash to formulate high performance concretes particularly where durability is a key consideration or to meet construction challenge brought about by architectural creativity. One of the key attributes of SuperPozz® is the significant improvement in long term concrete performance with the resulting reduction in maintenance costs. Applications for SuperPozz® include:

• Self-compacting or self placing concretes
• High performance ready-mixed and precast concrete
• Wet sprayed concrete
• Tunnelling concretes
• Proprietary pre-bagged repairs, precision grouts and flowable screeds
• Marine environment concretes where durability is critical
• Filler material in the manufacture of extruded plastics and rubber compounds

SuperPozz® has been used extensively in the concrete foundations and piles for the Burj Dubai Tower which, when completed, will be the world’s tallest building at over 700 metres high.

(UNCLASSIFIED)

PozzFill® is widely used in the production of general purpose concrete products and in the manufacture of cement. Other applications include structural fill, road stabilisation, grouts, mine back-filling and dry precast products. PozzFill®, like DuraPozz®, fully complies with the requirements for fly ash as a constituent in factory blended common cements in accordance with SANS EN197. DuraPozz® and PozzFill® are delivered to site in pneumatic tankers.

(UNCLASSIFIED)

PozzSand® is termed a ‘conditioned’ fly ash product in that approximately 10% potable water is added to fly ash enabling PozzSand® to be transported in tipper trucks, which are covered by tarpaulin to minimise dust. As the name suggests,the product can be used as a reactive replacement for fine sand (aggregate) in concrete and is often used by cement producers as a source of alumina (AI2O3) - typical value in fly ash >30% - for the ‘raw’ mix or kiln feed.