Abstract
The artificial lightweight aggregates (ALAs) were manufactured by quick firing using reject ash and dredged soil produced from thermoelectric power plant, and the behavior of radial crack generated in ALAs was investigated. The radial crack is most common in aggregate from reject ash containing 30~90 wt% dredged soil, but the length of crack branches decreased by increasing dredged soil content. The cracks were generated in aggregates from reject ash containing 30 wt% dredged soil within only 30 s, but the longer retention time for firing diminish the crack gradually. The noticeable crack did °Ccur inside the aggregate fired quickly at above 1200°C. The radial crack in aggregates of reject ash could be decreased by addition of dredged soil due to lower constituents causing loss on ignition. In the ALAs fabricated by slow firing from room temperature with 10°C/min speed, the crack were not formed and its bloating properties were excellent. The ALAs containing no radial crack could be produced with the specific gravity of 0.9~1.5 and water absorption of 1~17% by controlling mixed ratio, firing temperature and retention time and various firing method.
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