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 Undrained Behavior of Microbially Induced Calcite Precipitated Sand with Polyvinyl Alcohol Fiber
Tác giả hoặc Nhóm tác giả: Sun-Gyu Choi, Tung Hoang and Sung-Sik Park
Nơi đăng: Applied Sciences - MDPI; Số: 1214;Từ->đến trang: 1-11;Năm: 2019
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Microbially induced calcite precipitation can cement sand and is an environment-friendly
alternative to ordinary Portland cement. In this study, clean Ottawa sand was microbially treated
to induce calcite contents (CCs) of 0%, 2%, and 4%. Polyvinyl alcohol fiber was also mixed with
the sand at four different contents (0%, 0.2%, 0.4%, and 0.6%) with a constant CC of 4%. A series
of undrained triaxial tests was conducted on the treated sands to evaluate the effects of the calcite
treatment and fiber inclusion. Their hydraulic conductivity was also determined using a constant
head test. As the CC increased from 0% to 4%, the friction angle and cohesion increased from 35.3◦ to 39.6◦ and from 0 to 93 kPa, respectively. For specimens with a CC of 4%, as the fiber content increased from 0% to 0.6%, the friction angle and cohesion increased from 39.6◦ to 42.8◦ and from 93 to 139 kPa, respectively. The hydraulic conductivity of clean Ottawa sand decreased by a factor of more than 100 as the CC increased from 0% to 4%. The fiber inclusion had less effect on the hydraulic conductivity of the specimen with 4% CC
ABSTRACT
Microbially induced calcite precipitation can cement sand and is an environment-friendly
alternative to ordinary Portland cement. In this study, clean Ottawa sand was microbially treated
to induce calcite contents (CCs) of 0%, 2%, and 4%. Polyvinyl alcohol fiber was also mixed with
the sand at four different contents (0%, 0.2%, 0.4%, and 0.6%) with a constant CC of 4%. A series
of undrained triaxial tests was conducted on the treated sands to evaluate the effects of the calcite
treatment and fiber inclusion. Their hydraulic conductivity was also determined using a constant
head test. As the CC increased from 0% to 4%, the friction angle and cohesion increased from 35.3◦ to 39.6◦ and from 0 to 93 kPa, respectively. For specimens with a CC of 4%, as the fiber content increased from 0% to 0.6%, the friction angle and cohesion increased from 39.6◦ to 42.8◦ and from 93 to 139 kPa, respectively. The hydraulic conductivity of clean Ottawa sand decreased by a factor of more than 100 as the CC increased from 0% to 4%. The fiber inclusion had less effect on the hydraulic conductivity of the specimen with 4% CC
[ applsci-09-01214.pdf ]
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