- 期刊
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Evaluation of Suitability of Selected Dredged Sand and Sludge for Engineering Application
並列摘要
This paper investigates the possibility of using sludge as alternative to sharp sand in concrete production. Sludge was obtained from the burrow pit and dewatered on the site. The obtained samples were tested in the laboratory for moisture content, particle size distribution and silt/clay content. Concrete produced was tested for water absorption, density and shrinkage. Also, compressive strength of concrete was determined using compression machine. The obtained results showed that sand and sludge have moisture contents of 22.22% and 111% respectively. The percentage of clay in the sand was 2.78% and that of sludge is 77.78%. The particle size distribution classified the sand into well graded and the poorly graded sludge kind. Results showed that sand has a pH of 7.78 and that of sludge is 5.32. Compressive strength of concrete produced from sand varied from 10.11N/mm^2, 11.78N/mm^2, 17.04N/mm^2 and 21.78N/mm^2 cured for 7, 14, 21 and 28 days respectively and concretes produced from sludge varied from 2.03N/mm^2, 3.63N/mm2, 9.70N/mm^2 and 12.52 N/mm^2 cured for 7, 14, 21 and 28 days respectively. It was discovered that compressive strength of concrete produced from sand is higher than 21 N/mm^2 and that of sludge is lower, hence, sludge is suitable for production of bricks.