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
N1 - Funding Information:
The authors acknowledge the support of the Civil, Mechanical, and Manufacturing Innovation (CMMI) Division at National Science Foundation (No. 1233566). The research team acknowledges the efforts of several undergraduate students, including Pierre Bick, Alexa Hendricks, and Yassira Alaziz, and graduate students including Hang Dong, Hankai Zhu, Suguang Xiao, and Lusu Ni. Also, the authors acknowledge the help of Dan Zeroka and Edward Tomlinson, technician, and instrumentation and system specialist, respectively, at Lehigh University''s Advanced Technology for Large Structural Systems (ATLSS) Engineering Research Center.
Publisher Copyright:
© 2015 American Society of Civil Engineers.
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 -