Effect of rheological parameters on rice husk ash blended pastes with various superplasticizers

  • Rice husk ash (RHA) is a low-energy efficient material with high pozzolanic characteristics compared to other supplementary cementitious materials (SCMs). The replacement of cement with RHA has extensive improvement on the mechanical properties of concrete. However due to the porous nature of the RHA particles, it requires a higher water demand when replaced with Portland cement. Therefore, superplasticizers (SPs) are essential to reduce the water demand and improve the workability of the mixes. There is very little information about the effect of RHA with added SPs in its fresh state. Hence, this paper investigates the interaction of RHA pastes with three types of SPs, i.e. one polycarboxylate-based SP and two different types of lignosulphonates. This paper presents results of the investigation related to the flow behaviour of blended mixes with increasing percentage of RHA. The yield stress for the pastes with and without the addition of SPs is investigated over time as well as theRice husk ash (RHA) is a low-energy efficient material with high pozzolanic characteristics compared to other supplementary cementitious materials (SCMs). The replacement of cement with RHA has extensive improvement on the mechanical properties of concrete. However due to the porous nature of the RHA particles, it requires a higher water demand when replaced with Portland cement. Therefore, superplasticizers (SPs) are essential to reduce the water demand and improve the workability of the mixes. There is very little information about the effect of RHA with added SPs in its fresh state. Hence, this paper investigates the interaction of RHA pastes with three types of SPs, i.e. one polycarboxylate-based SP and two different types of lignosulphonates. This paper presents results of the investigation related to the flow behaviour of blended mixes with increasing percentage of RHA. The yield stress for the pastes with and without the addition of SPs is investigated over time as well as the plastic viscosity.zeige mehrzeige weniger

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Metadaten
Autor*innen:Nsesheye Susan PriebeORCiD
Koautor*innen:Wolfram SchmidtORCiD, Sarah Leinitz, Hans-Carsten KühneORCiD, Andreas Rogge
Dokumenttyp:Vortrag
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
DDC-Klassifikation:Naturwissenschaften und Mathematik / Chemie / Analytische Chemie
Freie Schlagwörter:Cement; Plastic viscosity; Rice husk ash; Superplasticizers; Workability; Yield stress
Veranstaltung:1st International Conference on Construction Materials for Sustainable Future
Veranstaltungsort:Zadar, Croatia
Beginndatum der Veranstaltung:19.04.2017
Enddatum der Veranstaltung:21.04.2017
URL:http://www.grad.hr/coms/ocs/public/coms2017/Proceedings_of_the_CoMS_2017.pdf
Bemerkung:
Geburtsname von Priebe, Nsesheye Susan: Msinjili, N. S. -  Birth name of Priebe, Nsesheye Susan: Msinjili, N. S.
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.07.2017
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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