Understanding the binder chemistry, microstructure, and physical properties of volcanic ash phosphate geopolymer binder

dc.contributor.authorDjobo, Jean Noël Yankwa
dc.contributor.authorStephan, Dietmar
dc.date.accessioned2023-09-07T09:11:20Z
dc.date.available2023-09-07T09:11:20Z
dc.date.issued2022-1-15
dc.description.abstractThis work aims to assess the influence of the chemical composition of the binder resulting from the reaction of phosphoric acid and volcanic ash on its final characteristics. Six initial compositions of volcanic ash phosphate geopolymer with molar ratios Fe/P of 0.27, 0.5, 0.54, 0.81, 1, and 1.5 were designed by adding various dosages of phosphoric acid to volcanic ash. The results show that the hardening time increases with the decrease of molar ratios Fe/P. An excess of phosphoric acid leads to an unstable binder that is partially destroyed with the aging of the binder. The volcanic ash phosphate geopolymer with molar ratios of Fe/P = 0.5–0.54 has the optimum compressive strength (49–53 MPa at 90 days), the lowest water absorption (8.8-9.5 wt.%) as well as porosity (18–19.6 vol.%). The main binder is a porous phase of ferro-silico-aluminophosphate. Secondary phases were also identified in some mixes including ferro-aluminophosphate and magnesium phosphate.en
dc.description.sponsorshipTU Berlin, Open-Access-Mittel – 2022
dc.identifier.eissn1551-2916
dc.identifier.issn0002-7820
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/19942
dc.identifier.urihttps://doi.org/10.14279/depositonce-18740
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
dc.subject.otherbinder chemistryen
dc.subject.othermicrostructureen
dc.subject.otherphosphoric aciden
dc.subject.otherphysical propertiesen
dc.subject.othervolcanic ashen
dc.titleUnderstanding the binder chemistry, microstructure, and physical properties of volcanic ash phosphate geopolymer binder
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.doi10.1111/jace.18333
dcterms.bibliographicCitation.issue5
dcterms.bibliographicCitation.journaltitleJournal of the American Ceramic Society
dcterms.bibliographicCitation.originalpublishernameWiley
dcterms.bibliographicCitation.originalpublisherplaceNew York, NY
dcterms.bibliographicCitation.pageend3237
dcterms.bibliographicCitation.pagestart3226
dcterms.bibliographicCitation.volume105
dcterms.rightsHolder.referenceCreative-Commons-Lizenz
tub.accessrights.dnbfree
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Bauingenieurwesen::FG Baustoffe und Bauchemie
tub.publisher.universityorinstitutionTechnische Universität Berlin

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