PMID- 37687460
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230911
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 16
IP  - 17
DP  - 2023 Aug 23
TI  - Assessment of the Composition Effect of a Bio-Cementation Solution on the 
      Efficiency of Microbially Induced Calcite Precipitation Processes in Loose Sandy 
      Soil.
LID - 10.3390/ma16175767 [doi]
LID - 5767
AB  - Soil properties are the most important factors determining the safety of civil 
      engineering structures. One of the soil improvement methods studied, mainly under 
      laboratory conditions, is the use of microbially induced calcite precipitation 
      (MICP). Many factors influencing the successful application of the MICP method 
      can be distinguished; however, one of the most important factors is the 
      composition of the bio-cementation solution. This study aimed to propose an 
      optimal combination of a bio-cementation solution based on carbonate 
      precipitation, crystal types, and the comprehensive strength of fine sand after 
      treatment. A series of laboratory tests were conducted with the urease-producing 
      environmental strain of bacteria B. subtilis, using various combinations of 
      cementation solutions containing precipitation precursors (H(2)NCONH(2), 
      C(6)H(10)CaO(6), CaCl(2), MgCl(2)). To decrease the environmental impact and 
      increase the efficiency of MICP processed, the addition of calcium lactate (CaL) 
      and Mg ions was evaluated. This study was conducted in Petri dishes, assuming a 
      14-day soil treatment period. The content of water-soluble carbonate precipitates 
      and their mineralogical characterization, as well as their mechanical properties, 
      were determined using a pocket penetrometer test. The studies revealed that a 
      higher concentration of CaL and Mg in the cementation solution led to the 
      formation of a higher amount of precipitates during the cementation process. 
      However, the crystal forms were not limited to stable forms, such as calcite, 
      aragonite, (Ca, Mg)-calcite, and dolomite, but also included water-soluble 
      components such as nitrocalcite, chloro-magnesite, and nitromagnesite. The 
      presence of bacteria allowed for the increasing of the carbonate content by 
      values ranging from 15% to 42%. The highest comprehensive strength was achieved 
      for the bio-cementation solution containing urea (0.25 M), CaL (0.1 M), and an 
      Mg/Ca molar ratio of 0.4. In the end, this research helped to achieve higher 
      amounts of precipitates with the optimum combination of bio-cementation solutions 
      for the soil improvement process. However, the numerical analysis of the 
      precipitation processes and the methods reducing the environmental impact of the 
      technology should be further investigated.
FAU - Fronczyk, Joanna
AU  - Fronczyk J
AUID- ORCID: 0000-0001-5963-7813
AD  - Institute of Civil Engineering, Warsaw University of Life Sciences-SGGW, 166 
      Nowoursynowska Str., 02-787 Warsaw, Poland.
FAU - Marchelina, Nadella
AU  - Marchelina N
AD  - Faculty of Civil Engineering and Architecture, Lublin University of Technology, 
      40 Nadbystrzycka Str., 20-618 Lublin, Poland.
FAU - Pyzik, Adam
AU  - Pyzik A
AD  - Faculty of Civil Engineering and Architecture, Lublin University of Technology, 
      40 Nadbystrzycka Str., 20-618 Lublin, Poland.
FAU - Franus, Malgorzata
AU  - Franus M
AUID- ORCID: 0000-0003-2317-4196
AD  - Faculty of Civil Engineering and Architecture, Lublin University of Technology, 
      40 Nadbystrzycka Str., 20-618 Lublin, Poland.
LA  - eng
GR  - POIR.04.04.00-00-14E6/18-00/Foundation for Polish Science/
PT  - Journal Article
DEP - 20230823
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC10488806
OTO - NOTNLM
OT  - bio-stabilization
OT  - calcite
OT  - loose sandy soil
OT  - microbially induced calcite precipitation
OT  - soil improvement
COIS- The authors declare no conflict of interest.
EDAT- 2023/09/09 11:44
MHDA- 2023/09/09 11:45
PMCR- 2023/08/23
CRDT- 2023/09/09 01:20
PHST- 2023/07/17 00:00 [received]
PHST- 2023/08/07 00:00 [revised]
PHST- 2023/08/18 00:00 [accepted]
PHST- 2023/09/09 11:45 [medline]
PHST- 2023/09/09 11:44 [pubmed]
PHST- 2023/09/09 01:20 [entrez]
PHST- 2023/08/23 00:00 [pmc-release]
AID - ma16175767 [pii]
AID - materials-16-05767 [pii]
AID - 10.3390/ma16175767 [doi]
PST - epublish
SO  - Materials (Basel). 2023 Aug 23;16(17):5767. doi: 10.3390/ma16175767.