하수슬러지를 이용한 탄화경량골재의 제조 특성 연구 = Study on Manufacturing Characteristics of Carbonated lightweight Aggregate using Sewage Sludge

다국어 초록 (Multilingual Abstract)

In this study, the carbonized aggregate of light weight and high mechanical strength using sewage sludge was evaluated with changing carbonation variables of temperature, detention time and feed condition. Porosity and mechanical strength was simultaneously increased according to increase of carbonization temperature unexpectedly. Carbonization detention time above 1 hour nearly affect on the porosity, but mainly on mechanical strength of the carbonized aggregate in case of clay addition. On 900 ℃, porosity and mechanical strength was increased rapidly, but above 1000 ℃, porosity began to decrease. Clay addition was very effective on increase of mechanical strength following much loss in porosity. The carbonized aggregate manufactured at 900 ℃ adding 30 % clay in sewage sludge was higher a little in porosity and 3 times in mechanical strength than those at 700 ℃ not adding clay. Consequently, in manufacturing the carbonized aggregate having simultaneously high porosity and mechanical strength, it is desirable to have operational condition of 900 ~ 1000 ℃ temperature and 1 hour time, and clay addition within 30 % for further higher mechanical strength.

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