Mechanical and durability characteristics of GGBS-based self-healing geopolymer mortar produced using by an endospore-forming bacterium

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dc.authoridTurkmen, Ibrahim/0000-0001-7560-0535
dc.authoridEKINCI, ENES/0000-0001-7669-887X
dc.authorwosidTurkmen, Ibrahim/AAH-1541-2019
dc.contributor.authorEkinci, Enes
dc.contributor.authorTurkmen, Ibrahim
dc.contributor.authorBirhanli, Emre
dc.date.accessioned2024-08-04T20:52:13Z
dc.date.available2024-08-04T20:52:13Z
dc.date.issued2022
dc.departmentİnönü Üniversitesien_US
dc.description.abstractHealing process of the gaps and cracks in the structure of geopolymer binders, which have emerged as greener alternatives compared to their traditional Portland cement counterparts, is of great importance in terms of a long economic life. The application of the microbial induced carbonate precipitation (MICP) method, which is the most striking of the various healing techniques applied to building materials, on geopolymer composites has been limited to a few successful studies. At this point, it is considered to be an important step to examine the effects of addition of bacteria on the mechanical and durability characteristics of geopolymer composites in detail. Therefore, this paper was designed to examine the effect of the usage of Bacillus subtilis on the mechanical and durability performance of ground blast furnace slag (GBFS)-based geopolymer mortar (GPM) specimens. In the GPM specimens activated with Na2SiO3, the total liquid/ binder ratio as 0.55 and the binder/fine aggregate ratio as 1:2 was kept constant. Bacterial cultures in liquid form prepared at different concentrations (109 and 107 CFU/mL) were added directly to the Na2SiO3 at 0, 1, 2 and 3% by weight of GBFS. GPM samples, which were prepared in seven different groups in total, were kept in three different curing mediums (precipitation medium, water and ambient conditions) from 7th day to the 28th day. After the curing period was over, the compressive strength, electrical resistivity, sulfate and acid resistance, capillary water absorption, splitting tensile strength and permeability properties were investigated on the GPM samples. In addition, the above-mentioned test results were confirmed by the microstructural analyzes performed. Experimental findings revealed that the optimum bacterial concentration and bacterial dosage values were 107 CFU/mL and 3%, respectively, in terms of both mechanical properties and durability performances. On the other hand, it was observed that all of the GPM specimens cured in precipitation medium (PM) and produced using bacteria had superior performances compared to their counterparts cured in water and ambient conditions. This situation clearly demonstrated that an effective self-healing process that will occur in GPM samples produced with the addition of bacteria directly could only be possible by creating a curing environment containing urea and calcium.en_US
dc.description.sponsorshipInonu University [FDK-2020-2156]en_US
dc.description.sponsorshipThe authors are grateful to the Inonu University for their financial support for the project FDK-2020-2156.en_US
dc.identifier.doi10.1016/j.jobe.2022.104944
dc.identifier.issn2352-7102
dc.identifier.scopus2-s2.0-85134603224en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.jobe.2022.104944
dc.identifier.urihttps://hdl.handle.net/11616/100797
dc.identifier.volume57en_US
dc.identifier.wosWOS:000861682500002en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofJournal of Building Engineeringen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectGeopolymeren_US
dc.subjectSelf -healingen_US
dc.subjectMechanical propertiesen_US
dc.subjectDurabilityen_US
dc.subjectWater absorptionen_US
dc.titleMechanical and durability characteristics of GGBS-based self-healing geopolymer mortar produced using by an endospore-forming bacteriumen_US
dc.typeArticleen_US

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