半水石膏を利用したセメント安定処理土の一軸圧縮特性に及ぼす乾湿繰り返し作用の影響

Abstract

In the construction site, an improved ground may be exposed to wetting and drying repetitions with rainwater even if we assume it is under air-dried condition. This paper describes the effect of wetting and drying repetitions on unconfined compressive characteristics of cement-stabilized soils mixed with bassanite produced from waste plasterboard. As a result, the unconfined compressive strength of cement-stabilized soils mixed with bassanite with wetting and drying repetitions is about 90% of those under air-dried condition although the unconfined compressive strength of cement-stabilized soil with wetting and drying repetitions decreases to about 70-80% of those under air-dried condition. Bassanite produced from waste plasterboard is effective as improver for soils even if improved soils are exposed to wetting and drying repetitions.