Effect of Gum Arabic karroo as a Water-Reducing Admixture in Concrete
| Autor: | Ramadhan Wanjala Salim, Julius M. Ndambuki, Rose Mbugua |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
food.ingredient 0211 other engineering and technologies 02 engineering and technology lcsh:Technology Article food 021105 building & construction General Materials Science Composite material lcsh:Microscopy Curing (chemistry) Gum Acacia karroo lcsh:QC120-168.85 water-reducing admixture lcsh:QH201-278.5 lcsh:T concrete compressive strength 021001 nanoscience & nanotechnology Pulp and paper industry Concrete slump test Slump Compressive strength lcsh:TA1-2040 Gum arabic lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 |
| Zdroj: | Materials; Volume 9; Issue 2; Pages: 80 Materials, Vol 9, Iss 2, p 80 (2016) Materials |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma9020080 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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