Please use this identifier to cite or link to this item: https://scholarhub.balamand.edu.lb/handle/uob/7585
Title: Development of geopolymer and cement-based shotcrete mortar: Impact of mix design parameters and spraying process
Authors: Hwalla, Joud
El-Hassan, Hilal
El-Mir, Abdulkader 
Assaad, Joseph 
El-Maaddawy, Tamer
Affiliations: Department of Civil and Environmental Engineering 
Department of Civil and Environmental Engineering 
Keywords: Cement
Geopolymer
Mortar
Shotcrete
Spraying
Issue Date: 2024-10-25
Publisher: Elsevier
Part of: Construction and Building Materials
Volume: 449
Abstract: 
Shotcrete mortar is used in various construction works, including repair, tunneling, mining, and slope stabilization, among others. Traditionally, cement is used to produce shotcrete mortars with high viscosity, flowability, and early strength. Geopolymers (GP) have the potential to replace cement in shotcrete mortars, owing to their ability to reduce the material's environmental footprint without compromising performance. This investigation assesses the feasibility of utilizing fly ash and blast furnace slag-based GP mortars produced with dune sand in shotcrete applications while comparing them to cement-based mixtures. The GP and cement-based shotcrete mortars were designed to have similar yield stress values. The evaluated properties included the initial flow, thickness layer, rebound material, rheological properties, setting time, compressive strength, ultrasonic pulse velocity, and pull-off bonding strength. Test results showed direct relationships between the yield stress and initial flow values, as well as between the buildup thickness and plastic viscosity, revealing that GP mortars were suitable for shotcrete applications, specifically those produced with flow values of 18.5 cm or less. GP mixtures produced with higher slag content than fly ash, higher sand content compared to binder, higher SH molarity, and lower solution content achieved higher buildup thickness owing to their higher viscosity. In the second phase, the performance of four mixes with different initial flows was assessed at various pumping flow rates and distances between the wall and machine pipe nozzle. The findings confirmed that these spraying parameters are crucial to improve the shotcrete performance of GP mortar with varying fresh behaviors.
URI: https://scholarhub.balamand.edu.lb/handle/uob/7585
ISSN: 09500618
DOI: 10.1016/j.conbuildmat.2024.138457
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Civil and Environmental Engineering

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