Abstract
The mechanical behavior of sands treated using microbially induced carbonate precipitation (MICP) has been investigated at the macroscale and the microscale. Triaxial and confined compression tests with embedded shear and compression wave (S-wave and P-wave) sensors were conducted on two MICP-treated sands, Ottawa 50=70 and 20=30 silica sands. Triaxial compression tests were conducted at three different confining pressures (25, 50, and 100 kPa). Tests were also performed at calcium chloride (CaCl2) concentrations of 0.1 and 0.3 M, resulting in specimens with average calcium carbonate (CaCO3) content ranging from 1.5 to 2.5% for the 50=70 sand and from 1 to 1.6% for the 20=30 sand. In contrast to previous research, the results of triaxial tests presented in this paper show an increase of the soil strength even at 1% calcium carbonate content. After the tests, samples taken from the specimens were utilized to measure the CaCO3 content and to perform analysis using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The SEM and EDS images were used to assess the morphology and spatial distributions of CaCO3 at the microscale.
| Original language | English (US) |
|---|---|
| Article number | 04015066 |
| Journal | Journal of Geotechnical and Geoenvironmental Engineering |
| Volume | 142 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1 2016 |
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Keywords
- Bio-mediated soil improvement
- Calcium carbonate
- Cementation
- Microbially induced carbonate precipitation
ASJC Scopus subject areas
- Environmental Science(all)
- Geotechnical Engineering and Engineering Geology
Cite this
Mechanical behavior of sands treated by microbially induced carbonate precipitation. / Lin, Hai; Suleiman, Muhannad T.; Brown, Derick G.; Kavazanjian, Edward.
In: Journal of Geotechnical and Geoenvironmental Engineering, Vol. 142, No. 2, 04015066, 01.02.2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mechanical behavior of sands treated by microbially induced carbonate precipitation
AU - Lin, Hai
AU - Suleiman, Muhannad T.
AU - Brown, Derick G.
AU - Kavazanjian, Edward
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The mechanical behavior of sands treated using microbially induced carbonate precipitation (MICP) has been investigated at the macroscale and the microscale. Triaxial and confined compression tests with embedded shear and compression wave (S-wave and P-wave) sensors were conducted on two MICP-treated sands, Ottawa 50=70 and 20=30 silica sands. Triaxial compression tests were conducted at three different confining pressures (25, 50, and 100 kPa). Tests were also performed at calcium chloride (CaCl2) concentrations of 0.1 and 0.3 M, resulting in specimens with average calcium carbonate (CaCO3) content ranging from 1.5 to 2.5% for the 50=70 sand and from 1 to 1.6% for the 20=30 sand. In contrast to previous research, the results of triaxial tests presented in this paper show an increase of the soil strength even at 1% calcium carbonate content. After the tests, samples taken from the specimens were utilized to measure the CaCO3 content and to perform analysis using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The SEM and EDS images were used to assess the morphology and spatial distributions of CaCO3 at the microscale.
AB - The mechanical behavior of sands treated using microbially induced carbonate precipitation (MICP) has been investigated at the macroscale and the microscale. Triaxial and confined compression tests with embedded shear and compression wave (S-wave and P-wave) sensors were conducted on two MICP-treated sands, Ottawa 50=70 and 20=30 silica sands. Triaxial compression tests were conducted at three different confining pressures (25, 50, and 100 kPa). Tests were also performed at calcium chloride (CaCl2) concentrations of 0.1 and 0.3 M, resulting in specimens with average calcium carbonate (CaCO3) content ranging from 1.5 to 2.5% for the 50=70 sand and from 1 to 1.6% for the 20=30 sand. In contrast to previous research, the results of triaxial tests presented in this paper show an increase of the soil strength even at 1% calcium carbonate content. After the tests, samples taken from the specimens were utilized to measure the CaCO3 content and to perform analysis using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The SEM and EDS images were used to assess the morphology and spatial distributions of CaCO3 at the microscale.
KW - Bio-mediated soil improvement
KW - Calcium carbonate
KW - Cementation
KW - Microbially induced carbonate precipitation
UR - http://www.scopus.com/inward/record.url?scp=84955569431&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84955569431&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)GT.1943-5606.0001383
DO - 10.1061/(ASCE)GT.1943-5606.0001383
M3 - Article
AN - SCOPUS:84955569431
VL - 142
JO - Journal of Geotechnical and Geoenvironmental Engineering - ASCE
JF - Journal of Geotechnical and Geoenvironmental Engineering - ASCE
SN - 1090-0241
IS - 2
M1 - 04015066
ER -