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Title: | Effect of Type of Sand on the Flowability and Compressive Strength of Slag-Fly Ash Blended Geopolymer Mortar | Authors: | Hwalla, Joud El-Hassan, Hilal Assaad, Joseph El-Maaddawy, Tamer Bawab, Jad |
Affiliations: | Department of Civil and Environmental Engineering | Keywords: | Compressive strength Dune sand Flow Fly ash Geopolymer Limestone Mortar Slag |
Issue Date: | 2023-06-04 | Part of: | International Conference on Civil, Structural and Transportation Engineering, No. 115 | Conference: | International Conference on Civil Structural and Transportation Engineering (ICCSTE'23) ( 8th : 4-6 June, 2023 : Canada ) | Abstract: | This paper investigates the influence of the type of fine aggregates on the properties of slag-fly ash blended geopolymer mortar. Twelve mixes were prepared with two types of sand: desert dune sand (DS) and crushed dolomitic limestone sand (CS). Different alkaline activator solution-to-binder (0.50, 0.60, and 0.65) and binder-to-sand ratios (1:2, 1:3, and 1:4) were considered to analyze their effect on the performance of the geopolymer mortar. The properties under investigation included the amount of additional water needed to maintain a flow of 150 ± 2 mm and the 7-and 14-day compressive strengths. Experimental test results showed that an increase in fine aggregates content resulted in a higher additional water demand, regardless of the type of sand used. As a result, the mortar compressive strength decreased by up to 29% compared to mixes with the lowest binder-to-sand ratios (1:2 for DS mixes and 1:3 for CS mixes). An increase in the alkaline activator solution-to-binder ratio reduced the additional water needed to satisfy the target flowability but increased the overall liquid-to-binder ratio. Meanwhile, for optimum compressive strength, DS-based mixes comprised B:S and AAS/B ratios of 1:2 and 0.60, respectively, while those of CS-based mixes were 1:3 and 0.65, respectively. Compared to mixes made with CS, those incorporating DS required the addition of more water to maintain the flowability and experienced up to 81% loss in compressive strength; still, DS-based mixes achieved 14-day compressive strengths exceeding 28 MPa. The experimental findings advocate the use of DS as fine aggregates in the production of slag-fly ash blended geopolymer mortar to be utilized in various construction applications. |
URI: | https://scholarhub.balamand.edu.lb/handle/uob/6970 | ISBN: | 9781990800221 | DOI: | 10.11159/iccste23.115 | Open URL: | Link to full text | Type: | Conference Paper |
Appears in Collections: | Department of Civil and Environmental Engineering |
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