Accuumulated amount of surplus soil from different construction sites, especially in tunneling, slope cutting, and underground excavation works in Japan is extremely high. As a waste material, this huge amount of soil creates many problems in its disposal, and therefore must be utilized in such a way that the environment remains unaffected. One of the recently practiced surplus soil utilization areas is the land reclamation work near coastal areas. However, half of the surplus soil produced being loose and weak in strength, it needs to be strengthened prior to the compaction. This paper relates to a study that elaborates the improved strength characteristics of some local surplus soils in Ehime Prefecture by the addition of slag, which also is an industrial waste. Also studied is the influence of mineral components on the strength attained by the addition of slag and some other cementing materials.
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