미생물활성에 의한 시멘테이션 작용을 이용한 모래지반의 안정화

Abstract

To evaluate bio-cementation of microbial on sands, laboratory test was conducted using acrylic cubic molding boxes (5 cm x 5 cm x 5 cm). It wasincubated the microbial, called Bacillus Pasteurii, according to Park et al (2011, 2012). and applied 50ml each specimen. Two type of sand samples usedwere Jumoonjin sand and common sand (well graded). These sands were molded in acrylic boxes with the relative density of 30 % and 60 % respectively. Microbial were poured onto the samples molded in acrylic boxes and cured at the room temperature and humidity. After 7, 14 and 21days, it was measuredthe compressive strength, pH, EC, and density and it were observed SEM and XRD to verify the effect of bio-cementation. It was found thatbio-cementation was increased a strength of sands and it was appeared that strengths were related to the type of sand and relative density. Therefore it wasconfirmed the solidification of sands using the bio-cementation by microbial activation and the usefullness of acrylic molding boxes when tests wereconducted on the soil of sands.