PMID- 36838245
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230228
IS  - 2076-2607 (Print)
IS  - 2076-2607 (Electronic)
IS  - 2076-2607 (Linking)
VI  - 11
IP  - 2
DP  - 2023 Jan 20
TI  - Experimental Study on Silt Soil Improved by Microbial Solidification with the Use 
      of Lignin.
LID - 10.3390/microorganisms11020281 [doi]
LID - 281
AB  - At present, in the field of geotechnical engineering and agricultural production, 
      with increasingly serious pollution an environmentally friendly and efficient 
      means is urgently needed to improve the soil mass. This paper mainly studied the 
      microbial induced calcium carbonate precipitation (MICP) technology and the 
      combined effect of MICP technology and lignin on the improvement of silt in the 
      Beijing area. Through unconfined compressive strength and dynamic triaxial test 
      methods, samples improved by microorganisms were studied to obtain the optimal 
      values of cement concentration and lignin under these two test schemes. The 
      results show that after the incubation time of Sporosarcina pasteurii reached 24 
      h, the OD600 value was 1.7-2.0 and the activity value (U) was 930-1000 mM ms/min. 
      In the unconfined static pressure strength test, after MICP treatment the optimal 
      concentration of cementitious solution for constant temperature and humidity 
      samples and constant-temperature immersion samples was 1.25 mol/L. The 
      compressive strength of the constant temperature and humidity sample was 1.73 
      MPa, and the compressive strength of the constant-temperature immersion sample 
      was 3.62 Mpa. At the concentration of 1.25 mol/L of cement solution, MICP 
      technology combined with lignin could improve the constant temperature and 
      humidity silt sample. The optimal addition ratio of lignin was 4%, and its 
      compressive strength was 1.9 MPa. The optimal lignin addition ratio of the sample 
      soaked at a constant temperature was 3%, and the compressive strength was 4.84 
      MPa. In the dynamic triaxial multi-stage cyclic load test, the optimal 
      concentration of cementation solution for the constant temperature and humidity 
      sample after MICP treatment was 1.0 mol/L, and the failure was mainly inclined 
      cracks. However, in the condition of joint improvement of MICP and lignin, the 
      sample mainly had a drum-shaped deformation, the optimal lignin addition ratio 
      was 4%, and the maximum axial load that the sample could bear was 306.08 N. When 
      the axial dynamic load reached 300 N, the strain accumulation of the 4% group was 
      only 2.3 mm. In this paper, lignin, an ecofriendly material, was introduced on 
      the basis of MICP technology. According to the failure shape and relevant results 
      of the sample, the addition of lignin was beneficial for the improvement of the 
      compressive strength of the sample.
FAU - Sun, Yongshuai
AU  - Sun Y
AUID- ORCID: 0000-0002-3641-9060
AD  - College of Water Resources & Civil Engineering, China Agricultural University, 
      Beijing 100083, China.
FAU - Zhong, Xinyan
AU  - Zhong X
AD  - School of Engineering and Technology, China University of Geosciences, Beijing 
      100083, China.
FAU - Lv, Jianguo
AU  - Lv J
AD  - School of Engineering and Technology, China University of Geosciences, Beijing 
      100083, China.
FAU - Wang, Guihe
AU  - Wang G
AD  - School of Engineering and Technology, China University of Geosciences, Beijing 
      100083, China.
LA  - eng
GR  - 8214060/Beijing Natural Science Foundation/
GR  - 42107164/National Natural Science Foundation of China/
PT  - Journal Article
DEP - 20230120
PL  - Switzerland
TA  - Microorganisms
JT  - Microorganisms
JID - 101625893
PMC - PMC9965713
OTO - NOTNLM
OT  - MICP
OT  - dynamic triaxial test
OT  - lignin
OT  - silt
OT  - unconfined compressive strength test
COIS- The authors declare that they have no conflict of interest to report regarding 
      the present study. The manuscript is an original work, and there is no interest 
      relationship. To our knowledge, this manuscript has not been published, in whole 
      or in part, and is not being considered for publication elsewhere.
EDAT- 2023/02/26 06:00
MHDA- 2023/02/26 06:01
PMCR- 2023/01/20
CRDT- 2023/02/25 03:46
PHST- 2022/11/22 00:00 [received]
PHST- 2023/01/05 00:00 [revised]
PHST- 2023/01/12 00:00 [accepted]
PHST- 2023/02/25 03:46 [entrez]
PHST- 2023/02/26 06:00 [pubmed]
PHST- 2023/02/26 06:01 [medline]
PHST- 2023/01/20 00:00 [pmc-release]
AID - microorganisms11020281 [pii]
AID - microorganisms-11-00281 [pii]
AID - 10.3390/microorganisms11020281 [doi]
PST - epublish
SO  - Microorganisms. 2023 Jan 20;11(2):281. doi: 10.3390/microorganisms11020281.