Journal
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
Volume 143, Issue 5, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)GT.1943-5606.0001640
Keywords
-
Funding
- National Science Foundation [CMMI-1234367]
- Engineering Research Center Program of the National Science Foundation under NSF [EEC-1449501]
Ask authors/readers for more resources
Microbially induced calcite precipitation (MICP) is a promising biocementation process that can improve the geotechnical properties of granular soils through the precipitation of calcite. In this study, a large-scale biocementation experiment was completed to evaluate differences in improvement obtained using a bioaugmentation approach with S. pasteurii and a biostimulation approach, which stimulated native ureolytic microorganisms to complete the process. Two identical 1.7-m-diameter soil tank specimens containing a 0.3-m-thick layer of sand were treated using three wells at a well-to-well spacing of 1.2m. Treatments were applied daily over 12days and were designed to evaluate differences between tanks by creating a nonuniform spatial distribution of improvement. During treatment, shear wave velocity and biogeochemical changes were monitored spatially and temporally. Post-treatment, cone penetration tests were completed to assess improvement, and samples were obtained for calcite content measurements. Similar final improvement was observed between tanks, with highly cemented regions achieving shear wave velocities over 960m/s and increases in tip resistances of over 419%. Results suggest that biostimulation may enable comparable biocementation improvement at the meter scale. (C) 2016 American Society of Civil Engineers.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available