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Effect of bauxite content and fineness on compressive strength of volcanic ash-based geopolymer mortars



Author(s): Léonel N. Tchadjié, Stephen O. Ekolu
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 419-424
Total Pages: 6
Language : English


Abstract: The particle size, mineralogical and chemical composition of starting materials are important factors affecting their geopolymeric reactivity. This study investigated the effect of bauxite fineness and content on the early compressive strength of volcanic ash-based geopolymers. Geopolymer mortars were prepared using volcanic ash with or without 5 to 20 wt% bauxite as a partial replacement. The bauxite used in the study was of three fineness levels comprising 0, 5 and 29 % retained on 45 μm sieve. Bauxite provided the source of alumina while sodium silicate solution was used as the alkaline activator. The results revealed that incorporation of bauxite decreased the overall SiO2/Al2O3 molar ratio in the geopolymer products. The 7-day compressive strength of 50 mm cube mortars varied between 30.3 and 44.5 MPa. A strength increase of up to 46.9 % was attained with 15 wt% bauxite content of fineness level 0 to 5 % retained on 45 μm sieve.


Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00


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