砕石粉の土質安定処理への有効利用について

抄録

Recently how to utilize resources and how to preserve natural environment have become serious problems in Japan. The waste rock powder is an industrial by-product from crusher plants. Since almost no disposal has been done for it, it causes the pollution of air and water. It is significant to examine how to utilize the waste rock powder as a construction material. If this becomes possible, the problems of resource utilization and the environmental pollution can be solved simultaneously. One method to solve the problems is to use the waste rock powder for soil stabilization.
The purpose of this study was to investigate the possibility of reutilizing the waste rock powder for a supplemental material of stabilization. Firstly the relationship between physical or chemical properties of the waste rock powder and the unconfined compressive strength of stabilized specimens was examined in detail. According to chemical analysis, it was clarified that the waste rock powder has fairly large specific surface area and contains a large amount of amorphous materials. The unconfined compressive strength of specimens stabilized with lime or cement was closely related to the specific surface area or the ratio of Al₂O₃/SiO₂, even if the waste rock powder was used as a supplemental material.
In conclusion, this rock powder is useful to increase the stabilizing effect on soils having a small amount of fine particles, and if it is used, it results in saving the cost by reducing the amount of lime or cement.