微生物沉积碳酸钙封堵混凝土裂缝的试验研究

微生物沉积碳酸钙封堵混凝土裂缝的试验研究Abstract:The experiment on microbial induced calcium carbonate precipitation for

微生物沉积碳酸钙封堵混凝土裂缝的试验研究 Abstract: Theexperimentonmicrobialinducedcalciumcarbonate precipitationforsealingconcretecrackswascarriedout.Thestudy aimedtoexplorethefeasibilityandeffectivenessofusing microorganismstoaddressconcretecrackingproblems.The experimentaldesigninvolvedtheuseoffivegroupsofbacterial agents,differentconcentrationratiosofcalciumlactateandurea, andvariouscrackwidths.Resultsshowedthattheapplicationof microbialinducedcalciumcarbonateprecipitation(MICP) effectivelysealedthecracks,andthemosteffectivebacterial agentswereBacillussubtilisandSporosarcinapasteurii.Moreover, thehighertheconcentrationofcalciumlactateandurea,the betterthesealingeffect.Thisresearchprovidesasustainable, cost-effectiveandenvironmentallyfriendlysolutioninthe constructionindustry. Keywords:microbialinducedcalciumcarbonateprecipitation, concretecracking,bacterialagents,calciumlactate,urea Introduction: Concretecrackingisacommonproblemincivilengineering andconstruction.Cracksinconcretestructurescanaffectits stability,andifleftunattended,itcanleadtoseriousproblemslike waterleakage,corrosionofthereinforcementsteelandstructural failure.Traditionally,sealingagentssuchasepoxiesand polyurethanesareusedtorepaircracks.However,theseagents havelimitationssuchashighcost,toxicity,andlowdurability. Inrecentyears,therehasbeengrowinginterestintheuseof microorganismsforrepairingconcretecracks.Microbialinduced calciumcarbonateprecipitation(MICP)isabiomineralization processwheremicroorganismsareusedtodepositcalcium carbonateinthecracks.Theprocessinvolvesusingbacterial agentstoenhancetheprecipitationofcalciumcarbonate,which fillsupthecracks. TheuseofMICPhasmanyadvantagesovertraditionalsealing agents.Itiscost-effective,environmentallyfriendly,andprovides asustainablesolution.Furthermore,itincreasesthedurabilityand strengthoftheconcretestructure.However,theapplicationof