n IMIESA - Eliminating bottlenecks : cement & concrete

Volume 41, Issue 7
  • ISSN : 0257-1978
  • Author
  • Source : IMIESA, Volume 41, Issue 7, Jul 2016, p. 65
  • Accreditation : Department of Higher Education and Training (DHET)



While achieving a dense, cohesive concrete mix with sufficient paste volume will enable the correct level of workability of the concrete, contractors must also pay attention to avoiding practices that will result in risky segregation during concrete pumping on construction sites. "Where material segregates and the water separates out of the mix - in other words, where water washes out of the paste - there is a strong possibility of blockages occurring in the pipeline," says Eddie Correia, executive vice-president, Chryso Southern Africa - a leading producer of super plasticisers. These water-reducing agents enable good aggregate coating by dispersing the cement grains, thereby minimising agglomeration of the mix and increasing the plasticity and, therefore, the workability of the concrete.

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