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The influence of activator composition on the strength, shrinkage and chloride migration resistance of alkali-activated slag mortars

  • Alkali-activated slag materials are known for their high Chloride penetration resistance. This makes them potentially applicable as repair systems for damaged steel-reinforced concrete structures, which are exposed to chloride attack. For this purpose, the influence of the activator composition, i.e. the SiO2 and Na2O concentration of the alkaline solution on a) the compressive strength, b) shrinkage and mass change and c) the resistance against chloride penetration of four alkali-activated slag mortars (AASM) were studied. An ordinary Portland cement-based mortar was used as the reference sample. Increasing SiO2 and Na2O concentrations increased the strength, shrinkage and mass loss of the AASMs. The resistance of the mortars against chloride penetration was evaluated using the non-steady-state migration coefficient Dnssm obtained from NT BUILD 492. The results indicate that the Dnssm is related to differences in the pore solution of the AASMs rather than to differences in theirAlkali-activated slag materials are known for their high Chloride penetration resistance. This makes them potentially applicable as repair systems for damaged steel-reinforced concrete structures, which are exposed to chloride attack. For this purpose, the influence of the activator composition, i.e. the SiO2 and Na2O concentration of the alkaline solution on a) the compressive strength, b) shrinkage and mass change and c) the resistance against chloride penetration of four alkali-activated slag mortars (AASM) were studied. An ordinary Portland cement-based mortar was used as the reference sample. Increasing SiO2 and Na2O concentrations increased the strength, shrinkage and mass loss of the AASMs. The resistance of the mortars against chloride penetration was evaluated using the non-steady-state migration coefficient Dnssm obtained from NT BUILD 492. The results indicate that the Dnssm is related to differences in the pore solution of the AASMs rather than to differences in their microstructure. An upcoming study of the authors is going to evaluate this hypothesis by the accelerated chloride penetration (diffusion) test.zeige mehrzeige weniger

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  • Hu et al 2018 Influence of activator composition on strength shrinkage and chloride migration resistance of AASMs.pdf
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Metadaten
Autor*innen:Nanjie Hu, Götz HüskenORCiD, Gregor GluthORCiD, Hans-Carsten KühneORCiD
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):6th International Conference Non-Traditional Cement and Concrete 2017
Jahr der Erstveröffentlichung:2018
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.4 Baustofftechnologie
Verlag:Trans Tech Publications
Verlagsort:Switzerland
Jahrgang/Band:761
Erste Seite:61
Letzte Seite:64
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Alkali-activated slag mortar; Chloride migration coefficient; Shrinkage; Strength
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Veranstaltung:6th International Conference Non-Traditional Cement and Concrete 2017
Veranstaltungsort:Brno, Czech Republic
Beginndatum der Veranstaltung:19.06.2017
Enddatum der Veranstaltung:22.06.2017
DOI:10.4028/www.scientific.net/KEM.761.61
ISSN:1662-9795
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:23.01.2018
Referierte Publikation:Nein
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