Effects of polysaccharide rheology modifying admixtures on early hydration of Portland cement and LC3

  • The construction sector accounts for 40% of global carbon emissions, and its impact is set to rise as growing populations drive increased construction activity, particularly in the Global South. In Africa, where cement is expensive and urban growth is rapid, innovative, locally tailored solutions are urgently needed. To address this environmental challenge, a common approach is to use limestone-calcined clay cement (LC3), which allows for approximately 50% clinker reduction with equivalent performance to OPC. However, LC3 often presents challenges in terms of fresh concrete properties due to its influence on rheological properties. This paper proposes the use of gum Arabic (GA), a polysaccharide biomass abundant in Africa, as a rheology modifying admixture. These local admixtures would provide access to chemical admixtures for a wider range of concrete users, including the informal sector, and create local value chains while minimising dependence on global supply streams. Rheometer, 1HThe construction sector accounts for 40% of global carbon emissions, and its impact is set to rise as growing populations drive increased construction activity, particularly in the Global South. In Africa, where cement is expensive and urban growth is rapid, innovative, locally tailored solutions are urgently needed. To address this environmental challenge, a common approach is to use limestone-calcined clay cement (LC3), which allows for approximately 50% clinker reduction with equivalent performance to OPC. However, LC3 often presents challenges in terms of fresh concrete properties due to its influence on rheological properties. This paper proposes the use of gum Arabic (GA), a polysaccharide biomass abundant in Africa, as a rheology modifying admixture. These local admixtures would provide access to chemical admixtures for a wider range of concrete users, including the informal sector, and create local value chains while minimising dependence on global supply streams. Rheometer, 1H nuclear magnetic resonance (1H NMR) and heat flow calorimetry (HFC) techniques were used to understand the influence of GA on both OPC and LC3 systems by monitoring their early hydration. Rheological results reveal that GA affects the fresh paste rheology of OPC and LC3 systems differently, requiring different dosages to achieve optimal performance. Heat flow and NMR analyses further confirm that GA retards the hydration reactions in both systems.zeige mehrzeige weniger

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Metadaten
Autor*innen:Renata LorenzoniORCiD
Koautor*innen:Bright Asante, Alexander MezhovORCiD, Sabine Kruschwitz, Wolfram SchmidtORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.4 Baustofftechnologie
8 Zerstörungsfreie Prüfung
8 Zerstörungsfreie Prüfung / 8.0 Abteilungsleitung und andere
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Early hydration; LC3; OPC; Polysaccharide-based admixture
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Infrastruktur / Green Intelligent Building
Veranstaltung:Sustainable Construction in Africa 2025
Veranstaltungsort:Nairobi, Kenya
Beginndatum der Veranstaltung:20.05.2025
Enddatum der Veranstaltung:22.05.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:30.07.2025
Referierte Publikation:Nein
Eingeladener Vortrag (wissenschaftliche Konferenzen):Nein
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