Influence of limestone addition on sodium sulphate activated blast furnace slag cements

Abstract

The effect of limestone replacement in the reaction and phase assemblage evolution of two sodium sulfate activated slag cements was investigated. The slag composition and its reactivity influenced the reaction kinetics of these materials. Paste with limestone addition exhibited an acceleration in reaction kinetics, particularly for slowly reacting slags. Ettringite and an aluminium substituted calcium silicate hydrate were identified as main reaction products in these cements, independently of the slag type or limestone replacement level. No significant changes in phase assemblages were observed with limestone addition for over 365 days of testing; however, these composite cements exhibited an increased compressive strength, consistent with a refined pore structure. These results indicate that it is possible to partially replace slag by limestone in sulfate activated slag cements without changing the type of reaction products forming in these systems, while also increasing compressive strength and achieving a similar refined pore structure.

Publication DOI: https://doi.org/10.1016/j.conbuildmat.2022.129527
Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Civil Engineering
College of Engineering & Physical Sciences
Additional Information: This study was supported by the School of Civil Engineering at the University of Leeds, and the UK Engineering and Physical Sciences Research Council (EPSRC) via the Early Career Fellowship EP/R001642/1. The authors are grateful with Vicky Leadley and Leslie Arkless for assistance with NMR measurements, and Dan Geddes from the University of Sheffield for assistance with MIP measurements. The data associated with this paper are openly available from the University of Leeds Data Repository, at https://doi.org/10.5518/1227. Copyright © 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Uncontrolled Keywords: Blast furnace slag,limestone,alkali-activated cements,hybrid cements,reaction kinetics,C-A-S-H,ettringite
Publication ISSN: 0950-0618
Last Modified: 11 Jun 2024 07:34
Date Deposited: 01 Jun 2023 16:12
Full Text Link:
Related URLs: https://www.sci ... 95006182203183X (Publisher URL)
PURE Output Type: Article
Published Date: 2022-12-19
Published Online Date: 2022-11-03
Accepted Date: 2022-10-18
Authors: Marsh, Alastair t.m.
Yue, Zengliang
Dhandapani, Yuvaraj
Button, Katharine
Sam, Adu-Amankwah (ORCID Profile 0000-0002-0568-2093)
Bernal, Susan a.

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