Concrete admixture solves issues related to poor aggregates

by Ofentse Sefolo
Concrete admixture solves issues related to poor aggregates

Construction chemical manufacturer, Mapei, has launched a new product that will help contractors who need consistent quality concrete in situations where poor or variable quality aggregates are the norm. According to Servaas Le Roux, product manager concrete admixtures, the company’s new Dynamon MS 100 product can dramatically improve results.

The new product is an acrylic-based admixture for concrete where the variations in aggregates won’t affect the concrete characteristics severely.

“This technically advanced product is formulated to deal with aggregates in ready-mix and precast concrete containing high amounts of fine parts such as clay and mica which use more water than necessary. It lowers the water demand of such aggregates, allowing manufacturers stable manufacturing conditions even though the raw materials are not that stable. It is mainly used by concrete manufacturers to produce fluid concrete,” says Servaas.

An added benefit: a lower dosage of super plasticisers is needed
A further advantage of using Dynamon with less than the best materials is that it counteracts minerals that might make super plasticising the admixture less efficient. It means a lower dosage of super plasticisers is needed while allowing longer workability retention of the mix. Although it is suitable for concrete production of any type, it is particularly well suited to produce high consistency concrete, self-consolidating concrete, pumped concrete and fair face concrete.

Mapei has a range of products complementing the Dynamon MS 100 including super plasticisers in the same Dynamon range, viscosity-modifying, fume-based powdered and retarding admixtures. The company also recommends additional products to improve specialised concrete production such as Expancrete, which is an expanding agent used in the production of shrinkage-compensated concrete.

The product is supplied in a ready-to-use liquid form and can be added either to the mixing water or directly, after all the other components such as cement, aggregates and mineral additives have been added. After adding, Mapei SA recommends extended mixing time to ensure an even distribution of Dynamon MS 100 in the mix. It is most effective if applied in fluid concrete with a super plasticiser.

For more information, contact Mapei on +27 (11) 552 8476 or via www.mapei.co.za.

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