Paper Sludge Reuse in Lightweight Aggregates ManufacturingReport as inadecuate

Paper Sludge Reuse in Lightweight Aggregates Manufacturing

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Department of Civil Engineering, National Chung-Hsing University, No. 250, Kuo Kuang Road, Taichung 402, Taiwan


Department of Civil Engineering & Geomatics, Cheng Shiu University, No. 840, Chengcing Rd., Niaosong District, Kaohsiung 83347, Taiwan


Author to whom correspondence should be addressed.

Academic Editor: Tobias Fey

Abstract The lightweight aggregates used by the civil engineering market are sintered at a high temperature, about 1200 °C. In times of high energy prices and regulation of carbon dioxide emissions, lightweight aggregate products of the high-temperature process in sales marketing are not readily accepted. This study developed a sintered-type paper sludge lightweight aggregate. In order to reduce energy consumption, substitution of some reservoir sediment clay in paper sludge substitutes is to be expected. The study used two types of paper sludge green clay paper sludge and paper pulp sludge. The sintering temperature was reduced effectively as the green clay paper sludge was substituted for some of the reservoir sediment clay, and the optimum substitute ranges of green clay paper sludge were 10%–50%. The optimum substitute ranges of the paper pulp sludge were 10%–40%. Test results show that the properties of aggregates have a particle density of 0.66–1.69 g-cm3, a water absorption of 5%–30%, and a loss on ignition of 10%–43%. The loss on ignition of aggregate became greater with the increase in paper sludge content. This means that the calorific value provided by the paper sludge will increase as paper sludge content increases. Paper sludge can therefore be considered a good material to provide heat energy for sintering lightweight aggregate. View Full-Text

Keywords: paper sludge; lightweight aggregate; green building materials paper sludge; lightweight aggregate; green building materials

Author: How-Ji Chen 1, Ying-Chih Hsueh 1, Ching-Fang Peng 1 and Chao-Wei Tang 2,*



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