Journal
CEMENT & CONCRETE COMPOSITES
Volume 32, Issue 6, Pages 436-439Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2010.02.009
Keywords
Water purification sludge; Compressive strength; Cement production; Clinkering reaction; Heavy metal; TCLP
Funding
- Zhejiang Science and Technology Office [2007C21175]
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The feasibility of partial replacement of siliceous raw material for cement production with water purification sludge (WPS) was investigated by X-ray diffraction, free-lime analysis, compressive strength testing and toxicity characteristics leaching procedure (TCLP). It is found that WPS has no negative effects on the consumption of free lime and the formation of clinker minerals. The samples with WPS from 4 to 10 wt.% have higher 3 days and 7 days strengths than the control. After 28 days, however, only WPS replacements <7% increased the strength of samples. It is noteworthy that heavy metals in WPS were almost completely incorporated into the clinkers, and up to 28 days the heavy metals were not detected in the leachates. From the above results of clinker minerals, compressive strength and leaching tests, it can be concluded that WPS has the potential to be utilized as an alternative raw material in cement production. (C) 2010 Elsevier Ltd. All rights reserved.
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