Mechanical properties of alkali activated ground SiMn slag mortars with different types of aggregates

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Title: Mechanical properties of alkali activated ground SiMn slag mortars with different types of aggregates
Authors: Navarro, Rosa | García Alcocel, Eva María | Sánchez, Isidro | Garcés, Pedro | Zornoza, Emilio
Research Group/s: Durabilidad de Materiales y Construcciones en Ingeniería y Arquitectura
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil | Universidad de Alicante. Departamento de Construcciones Arquitectónicas
Keywords: SiMn slag | Alkali activation | Mortar | Aggregate
Knowledge Area: Ingeniería de la Construcción | Construcciones Arquitectónicas
Issue Date: 20-Oct-2018
Publisher: Elsevier
Citation: Construction and Building Materials. 2018, 186: 79-89. doi:10.1016/j.conbuildmat.2018.07.093
Abstract: This research investigates the mechanical performance and dimensional stability of mortars whose binder is prepared by alkali activation of ground granulated SiMn slag. Two types of activators have been used: NaOH and waterglass solutions. Three different types of aggregates have been tested: silica sand, limestone sand, and recycled sand obtained from recycled concrete. Three activator concentrations have been adopted in the binder design: 3.0, 3.5 and 4.0% Na2O for NaOH solution; and 4.0, 4.5 and 5.0% Na2O for waterglass solutions with a constant SiO2/Na2O of 1.0. The best mechanical performance was obtained for an aggregate/slag ratio of 2/1 when silica sand was used as aggregate: 68 MPa were obtained when waterglass was used as activator, and %Na2O of 4.5–5.0% at 90 days; 54 MPa were obtained for NaOH as activator and 4.0% Na2O at 90 days. Limestone sand also offered a good mechanical performance although the maximum compressive strength achieved was about 25% lower than values obtained with silica sand, but recycled concrete aggregate mortars exhibited poor results, probably due to the high absorption of recycled aggregates. The higher shrinkage was registered in mortars activated with waterglass, although autogenous shrinkage was low for all types of activators and aggregates, except for recycled concrete aggregate.
Sponsor: The authors wish to thank the Spanish Ministry of Economy and Competitiveness and European Union (FEDER) for project funding (BIA 2014-58194-R).
ISSN: 0950-0618 (Print) | 1879-0526 (Online)
DOI: 10.1016/j.conbuildmat.2018.07.093
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Elsevier Ltd.
Peer Review: si
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Appears in Collections:INV - DMCIA - Artículos de Revistas

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