파이버와 실리카흄을 사용한 쏘일-시멘트의 강도증진을 위한 연구

Abstract

Deep cement mixing method (DCM) has been frequently employed to increase a bearing capacity and to reduce a settlement of soft foundation soils. The magnitude of strength increase of soil stabilized with the deep cement mixing method is influenced by several factors because the basic mechanism of strength increase is closely related to the chemical reaction between soil and cement. Soil-cement has strong compressive strength, but it is weak tensile strength and flexural strength. The objective of this study is soil-cement improvement on tensile strength and flexural strength with fiber and silica fume. Clay picked up at a construction site in juchon, Gimhae. It is 96% natural water content, 61.78% plastic index, 2.72 specific gravity. This study used volume of 0.1%, 0.5% fiber. Used fibers are Steel fiber, Poly-Vinyl Alcohol, Poly-Propylene. 1 Group and 2 Group used Cement 150kg/m3, Silica fume added Cement weight 0% and 10%. Because Silica fume to assess the impact of compressive strength, tensile strength and flexural strength, 3 Group, 4 Group and 5 Group used Cement 300kg/m3, Silica fume added Cement weight 0%, 5% and 10%. As a result, soil-cement increased compressive strength when has added silica fume. But silica fume doesn't effect on tensile strength and flexural strength. When soil-cement has added fibers more quantity, increased tensile strength and flexural strength. Above all, When soil-cement is added PVA fiber, Maximum improvement tensile strength and flexural strength. In my estimate, fibers are good for soil-cement increase tensile strength and flexural strength.