抄録
Sewage sludge generated in Japan amounted to approximately 1.3 million tons per year as solids in 1986, and some 60% of the total amount was incinerated. Currently, most incinerated ash has been disposed by landfill and coastal reclamation, but effective utilization of incinerated ash is urgently required due to a reduction in disposal sites and for reuse of resources. This investigation intended to establish techniques to judge the soil conditioning effect of incinerated ash of sewage sludge when used as a soil conditioning additive for excavated soil and others. It also studied the hydration characteristic of incinerated ash and the strength of the conditioned soil. The results show that the soil conditioning effect of incinerated ash of sewage sludge depends on the degree of the hydratior reactivity. In addition, a hydration rate test is proposed as a simple method to judge the soil conditioning effect.
