2019 Volume 73 Issue 1 Pages 371-378
Sludge treatment at a ready-mixed plant has significant high cost and high environmental impact. Although it has been studied to effectively use this sludge as a fine day sludge powder. In this research, it focuses on the treatment process and influences the time required for the treatment and the treatment temperature on the rehydration behavior and the characteristics of hardened mortar. As a result, it was found that when the treatment time is prolonged, the rehydration ability is inferior due to the progress of hydration. And the rehydration ability is improved by generating free lime at a treatment temperature of about 500 degrees Celsius. In addition, it was shown that the amount of calcium hydroxide contained in the hydrated powder is an indicator of the rehydration ability. Furthermore, although it confirmed that a mass transfer characteristic improved. However, it does not same behavior on the product fine dry sludge powder.
