Journal
BUILDING AND ENVIRONMENT
Volume 43, Issue 6, Pages 991-998Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2007.02.002
Keywords
treated spent liquor sludge; fly ash; leaching
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Design mix of M-20 concrete was prepared in the laboratory by substituting cement with the treated spent liquor sludge (TSLS) and fly ash. During the study, TSLS is fixed at 7.5% by weight, and fly ash is varied as 5%, 10%, 15%, 20% and 25% to study the possibility of replacement of cement. A 15% fly ash gives the optimum compressive strength. Addition of fly ash has resulted in complete removal of toxicity as per US EPA toxicity characteristic leaching procedure (TCLP) test. A total of 7.5% sludge and 15% fly ash in M-20 concrete is expected to save Rs. 252/m(3) (approximate to USD 5.3/m(3)) of concrete. (C) 2007 Elsevier Ltd. All rights reserved.
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