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Optimization of Enzyme Induced Carbonate Precipitation (EICP) as a Ground Improvement Technique

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dc.contributor.authorAhenkorah, I.
dc.contributor.authorRahman, M.M.
dc.contributor.authorKarim, M.R.
dc.contributor.authorTeasdale, P.R.
dc.contributor.editorHambleton, J.P.
dc.contributor.editorMakhnenko, R.
dc.contributor.editorBudge, A.S.
dc.date.issued2020
dc.description.abstractEnzyme induced carbonate precipitation (EICP) is a bio-cementation technique and is a new area of Geotechnical Engineering. In this paper, a parametric study was conducted to evaluate and optimize the effect of concentration and activity of urease enzyme and concentration of other chemical constituents (urea and calcium chloride) on EICP process. pH, electrical conductivity (EC), and micro-structure analysis using scanning electron microscope (SEM) imaging were performed. Results indicate that, the precipitation ratio (PR), which is defined as the ratio of mass of precipitated CaCO3 in test tube and theoretical mass of CaCO3 is a function of the concentration of urea-CaCl2 (mol/L) and urease enzyme (kU/L). Rate of change in pH and EC during urea hydrolysis is influenced by urea and urease enzyme concentration. SEM images of CaCO3 precipitates from solution containing low active urease enzyme (3,500 U/g) showed a disordered and anhedral calcite crystals whereas the high active urease enzyme (40,150 U/g) showed euhedral and agglomerated rhombohedral calcite morphology.
dc.identifier.citationEvent/exhibition information: Geo-Congress 2020: Foundations, Soil Improvement, and Erosion, Minneapolis, US, 25/02/2020-28/02/2020 Source details - Title: Geotechnical Special Publication, 2020 / Hambleton, J.P., Makhnenko, R., Budge, A.S. (ed./s), vol.2020-February, pp.552-561
dc.identifier.doi10.1061/9780784482780.054
dc.identifier.isbn9781713807216
dc.identifier.orcidRahman, M.M. [0000-0002-0638-4055]
dc.identifier.orcidKarim, M.R. [0000-0002-5318-3862]
dc.identifier.urihttps://hdl.handle.net/11541.2/141564
dc.language.isoen
dc.publisherAMER SOC CIVIL ENGINEERS
dc.publisher.placeUS
dc.relation.fundingAustralian Government Research Training Program scholarship
dc.relation.ispartofseriesGeotechnical Special Publication
dc.rightsCopyright 2020 American Society of Civil Engineers
dc.source.urihttps://doi.org/10.1061/9780784482780.054
dc.subjecturease enzyme
dc.subjectchemical constituents
dc.subjectelectrical conductivity
dc.titleOptimization of Enzyme Induced Carbonate Precipitation (EICP) as a Ground Improvement Technique
dc.typeBook chapter
pubs.publication-statusPublished
ror.mmsid9916384102201831

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