Effect of some physical and chemical treatments on mechanical and physical properties of acacia nilotica wood-cement mixture
2006
Hassan, T.T., University of Upper Nile, Khartoum (Sudan). Faculty of Forestry | Abd-Algadir, A.Y., University of Khartoum, Shambat (Sudan). Faculty of forestry | Mohamoud, A.A., Agricultural Research Corporation, Soba (Sudan). Forestry Research Cent er | Alhedy, A.M.A., Agricultural Research Corporation, Soba (Sudan). Forestry Research Cent er
The study investigated the effect of some factors on the properties of Acacia nilotica (sunt) wood-cement mixture. Wood slabs were obtained from 30 sunt trees in Abu kuk Forest. Portland cement was used. The experiment was carried out to study the effect of cold water extraction for (0, 7 and 14 days) in addition to six levels of calcium chloride (1, 1.5, 2, 2.5, 3 and 3.5 %, based on cement weight) on the properties of the wood-cement mixture. In total, 72 specimen blocks (5*10*60cm3) were prepared using metal molds. Although the effect of extraction duration on the mechanical properties and water absorption was dependent on the level of calcium chloride, extracted wood had significantly higher strength and lower water absorption than non-extracted wood; there is no need for extraction more than 7-days. No significant differences in 2 hours water absorption and swelling were found between the six levels of calcium chloride when using non-extracted wood (control), increasing the level of calcium chloride in the mixture was associated with a decrease in strength properties and an increase in water absorption. When the wood was extracted, increasing the level of calcium chloride was associated with an increasing trend in the strength properties and a decrease 2-hours water absorption; the level at which the strength properties start to increase varied among properties and extraction levels
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