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Effect of Gum Arabic karroo as a Water-Reducing Admixture in Concrete

Department of Civil Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
Author to whom correspondence should be addressed.
Academic Editor: Maryam Tabrizian
Materials 2016, 9(2), 80;
Received: 13 October 2015 / Revised: 11 January 2016 / Accepted: 19 January 2016 / Published: 28 January 2016
Concrete is one of the most popular construction materials in the world. Chemical admixtures are ingredients added to concrete to enhance its properties. However, most chemical admixtures on the market today are expensive, thereby making them out of reach for small consumers of concrete. In Africa, use of chemical admixtures is rare despite the harsh weather conditions. In the current study, Gum from Acacia karroo (GAK) was used as a water-reducing admixture in concrete. A slump test, density and compressive strength were studied using different dosages of GAK while neat concrete was the control. Results showed that slump increased by 200% at a 2% dosage of GAK. This enabled reduction of water-to-binder (w/b) ratio from 0.61 to 0.48 for samples with a 3% dosage. Reduction in w/b resulted in increased compressive strength of 37.03% above the control after 180 days of curing for a 3% dosage. XRD studies also showed a decreased rate of hydration in the presence of GAK in concrete. It was concluded that GAK can be used in concrete as a water-reducing admixture, which is environmentally-friendly, thus producing sustainable and greener concrete. View Full-Text
Keywords: Gum Acacia karroo; concrete; water-reducing admixture; compressive strength Gum Acacia karroo; concrete; water-reducing admixture; compressive strength
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Mbugua, R.; Salim, R.; Ndambuki, J. Effect of Gum Arabic karroo as a Water-Reducing Admixture in Concrete. Materials 2016, 9, 80.

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