CONTRIBUTION OF STAINLESS-STEEL SLAG TO THE DEVELOPMENT OF STRENGTH FOR SEABED HEDORO

抄録

The utilization of industrial wastes as cement replacement material is one of the most desirable methods to solve environmental problems posed by the production of these wastes. Concerning beneficial aspects, the potential uses create new construction materials. There are only a few studies that have been reported on the effective utilization of slag obtained from stainless-steel factory. The objective of this study is, therefore, to illustrate the potential use of a stainless-steel slag as a blended cement material, and to elucidate the contribution of blended slag cement to the development of strength for seabed dredged sludge (hedoro). The present study investigates hardening effects through the two important strength parameters, unconfined compressive strength (q_u strength)and California bearing ratio(CBR). Evaluation on reaction rate of tricalcium silicate (C₃S) using X-ray diffraction analysis is proposed, and representative data are obtained. Based on the experimental results, the q_u strength of the hedoro stabilized with slag cement is higher than that of cement-stabilized hedoro in all respects. It is concluded that the slag powders added significantly accelerate the initial reaction rate of C₃S, resulting in an increase in short-term and long-term strength. The development of strength in relation to the hydration mechanism of C₃S is then discussed.