| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 95 === The sludge is a by-product in the industry of titanium dioxide refinement（i.e., SCDS）. It is a kind of acidic material of fine granular particles with high chloride ion content. The SCDS is originally used for making granulized by mixing with two-fold cement to serve as the aggregate （i.e., TCS）base course material for the foundation of road pavement .This study, to avoid the problems of corrosion on embedded metallic pipelines resulted form chloride ion released form inside of TCS, discussed the procedure of removing chloride ion form SCDS by water washing, the proportioning for TCS granulation, the properties of TCS materials, the California Bearining Ration （i.e., CBR）value of TCS materials and so on. In addition, the feasibility assessment of replacing the traditional manufacturing procedure oh TCS and loosening the restrictions on the use of TCS had also been conducted.
Results showed that the SCDS was still full of chlorine ion after being water-washed. Only if 5% soda ash was used could the chlorine ion be released from SCDS. Additionally, the use of filtering machine allowed the residual of chlorine ion in SCDS less than 500 ppm. Another finding was that the humidity and density were the determinants of strength for TCS. When being mixed with the proportion of 0.4 w/c and 1.2 or 1.6 cement (i.e., KYCⅢ) for 7 days, the strength of TCS could reach 210 kgf/cm2.
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