This study was carried out to examine the application of sewage sludge molten slag as coarse aggregate for concrete and the influence of the quality of molten slag on the mechanical properties of concrete. As a result, it was clarified that the mechanical properties of concrete by using molten slag coarse aggregate depended on the quality of molten slag. The concrete by using molten slag coarse aggregate which was good strength had performance equivalent to normal aggregate concrete. In the quality standard of molten slag for concrete, it is necessary to provide not only the density and water absorption but also the standard related to the strength of aggregate.

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The purpose of this study is to develop mechanical properties of concrete that using sewage sludge molten slag as coarse aggregate. As sewerage system spreads, sewage sludge that comes out from process of sewerage disposal is increasing. However remaining capacity of final disposal site is almost in the limit, and it is difficult to secure new disposal site. To build the recycling society is important to build sustainable development, and at present 70 percent sewage sludge is recycled. Sewage sludge slag is recycled as construction materials, fertilizer and fuel. The following were clarified by this research. Amount of elusion of heavy metals from sewage sludge molten slag were lower than environmental standards, and strength of molten slag was lowerthan natural coarse aggregate. Strength, durability factor of freezing thawing and compressive fatigue strength were decreased as the slag substitution ratio was increased, but drying shrinkage was not influenced from the slag substitution ratio.

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