Thermochemical Analysis in the Presintering Phase of Aggregates from Sludge-Marine Clay Mixes
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 1
Abstract
Rapid industrialization and urbanization in a highly limited land area leads to serious waste disposal problems. Scarcity of land causes the disposal of waste in landfills to be extremely uneconomical. An attractive alternative to waste disposal is conversion of waste into new resources. Past studies have indicated that the conversion of wastes into construction materials is a potential option for management of high volume wastes. However, due to the high processing costs of the wastes, the conversion may not be economically viable. This study examines the detailed thermochemistry of sludge-clay mixes in providing an in-depth understanding of the reactions involved during the process of fusion. Thermal gravimetric analysis detected increased weight loss of the materials around the temperatures of 520 and , indicating volatilization of organic matter and inorganic salts, at the two respective temperature levels. Differential scanning calorimetry results revealed endothermic reactions, possibly due to dehydroxylation of clay, between temperatures of 480 and , and calcite decomposition between the temperatures of 680 and . Intensified endothermic peaks were observed in the mixes of the two materials. Thermal gravimetric analysis–infrared absorption spectrometry revealed increased intensities of the absorption bands at at and at , as a result of the breakdown of organic matter and alkanes, respectively. Energy demand analysis determined the energy required for raising the temperature of each mix to reach each specific temperature. The intrinsic energy required to raise the firing temperature of the aggregates from was determined to be within the range of 20,347 and , with 100% sludge exhibiting the lowest energy requirement and 20% sludge exhibiting the highest energy requirement.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 1 • February 2006
Pages: 55 - 60
Copyright
© 2006 ASCE.
History
Received: Jul 9, 2004
Accepted: Apr 15, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
Notes
Note. Associate Editor: Hilary I. Inyang
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