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http://dx.doi.org/10.7843/kgs.2016.32.8.27

Engineering Characteristics of Bio-cemented Soil Mixed with PVA Fiber  

Choi, Sun-Gyu (Dept. of Civil Engrg., Iowa State Univ.)
Park, Sung-Sik (Dept. of Civil Engrg., Kyungpook National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.32, no.8, 2016 , pp. 27-33 More about this Journal
Abstract
In this study, Polyvinyl alcohol (PVA) fiber was used to increase strength (unconfined compressive strength and tensile strength) of bio-cemented sand using microorganism. Ottawa sand was mixed with PVA fibers having three fiber contents (0, 0.4, and 0.8%). The fiber mixed sand was treated 14 times by using Microbially Induced Calcite Precipitation (MICP) which included culture (2 times per day) during 7 days to improve its engineering properties. The Bacillus Sporosarcina pasteurrii (Bacillus sp.) was used for urease activity. The specimen was prepared as a cylindrical specimen of 5 cm in diameter and 10 cm in height. Unconfined compressive strength and tensile strength were measured after cementation. Moreover, calcium carbonate content and SEM analyses were performed with a piece of sample. An average value of unconfined compressive strength increased and then slightly decreased but an average value of tensile strength ratio increased with increasing carbonate content the in same condition. Unconfined compressive strength and tensile strength increased about 30% and 160%, respectively. A strength ratio of unconfined compressive strength to tensile strength representing the brittleness decreased from 8 to 4 when fiber content increased from 0.0 to 0.8%. Such bio-cemented sand can be applied into slope area to prevent its shear failure or increase its tensile strength.
Keywords
Microbially induced calcite precipitation; Unconfined compressive strength; Tensile strength; Sand; Fiber;
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Times Cited By KSCI : 1  (Citation Analysis)
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