Abstract
The purpose of this study is to manufacture lightweight aggregates for the recycling of water treatment sludge (WTS), to identify the physical properties of the aggregates, and to present a means by which to utilize the manufactured lightweight aggregates. The chemical composition and thermal properties were examined via a raw materials analysis. The aggregate examined here was fired by the rapid sintering method and the single-particle density and water absorption rate were measured. WTS has a high LOI and the calcined inorganic material has high refractoriness. When 30 wt% of purified sludge was added, the single-particle density of the aggregates was in the range of 0.8–1.2g/㎤ at temperatures of 1150–1200 °C. At temperatures of 1200 °C or higher, ultra-lightweight aggregates having a single-particle density of 0.8 or less could be produced. When applied to concrete by replacing the general aggregate in the concrete, a specimen with strength values of 20–45 ㎫ at 28 days was obtained, and when applied as a filter material, the performance was equal to or exceeded that of ordinary sand.
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