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17. Abstract In the present paper, axial strength and range of injury of concrete filled with aggregate are investigated by considering hydration reactions of alkali (S1020 and S400) and Portland Cement (PC). Analytical equation and a model equation of the strength deterioration are explicitly derived in terms of the relationship between the strength, total porosity (TP) and the water-cement ratio (W/C). With regard to TP and W/C, it was found that the strength of concrete containing S1020 is significantly higher than that of concrete filled with S400 and PC. The range of injury (R) is determined as a function of TP and W/C. The range of injury was found to increase in the order of PC < S40 < S1020. Based on the analytical equation, R of concrete filled with S1020 was found to be 1.62 times higher than that of concrete filled with S400 and PC.

18. Abstract 1. Introduction The growing concern regarding the sustainable management of urban wastewater has encouraged the development of low-cost and energy-efficient methods for the treatment of wastewater. Urban wastewater treatment in Korea is faced with a growing demand for the ‘chemical rate’, which represents the ratio of the chemical necessity for disinfection and current wastewater treatment operations. This ratio varies with the number of typhoons, rainfall and erosion. The average TSS/TOC ratio for the Seoul Metropolitan wastewater treatment plant is 1, whereas the average chemical rate for a tertiary biological operations is 18-24% and that of a secondary chemical treatment is 36%-45% of its TSS. In this study, a basic function and reliability of disinfection, as well as a cost-benefit model of this system were analyzed. A case study on the reuse of disinfected effluents was developed. The results show that the functions of disinfection and reuse can be modified for integrated wastewater management operations of the Seoul Metropolitan Wastewater Treatment Plant. However, the system configured to reduce the nuisance of combination disinfection and reused effluents requires additional research on engineering aspects. d2c66b5586