Ukpata, JO, Basheer, PAM and Black, L orcid.org/0000-0001-8531-4989 (2018) Influence of exposure environments on the durability of slagblended Cements. In: Basheer, PAM, (ed.) ICDCS 2018, Sixth International Conference on Durability of Concrete Structures. Sixth International Conference on Durability of Concrete Structures (ICDCS2018), 18-20 Jul 2018, Leeds, UK. Whittles Publishing , Caithness, United Kingdom , pp. 345-351. ISBN 9781849953948
Abstract
© ICDCS 2018. All rights reserved. Both chlorides and sulphates combine in seawater to affect the durability of reinforced concrete structures located in marine environments. This paper presents the results of an experimental study on slag blended cement systems, cured for 7 days, before exposure to a combined solution of sodium chloride (30 g/L) and sodium sulphate (3 g/L). Two slags of different chemical compositions, designated as slags 1 and 2 were respectively blended with Portland cement CEM I 52.5R at 30 and 70 wt.% replacement levels. Mechanical tests on mortar samples were complemented by microstructural examination and chemical characterisation on paste samples, all using a constant w/b ratio of 0.5, to investigate the influence of exposure environment. The exposure environments include water and ponding in combined chloride-sulphate solution at 20 °C and 38 °C (to reflect temperate and tropical climates). The results show that temperature has a significant effect on the durability of slag blends. Reduced sorptivity at higher temperature led to reduced chloride penetration at early age. This effect is less so at later age. Compressive strength generally improved with increase in chloride penetration. SEM-EDX elemental analysis provided a good basis for following chloride penetration profile. XRD analysis showed the conversion of monosulphate to ettringite, Friedel's salt and Kuzel's salt upon exposure to salt solution, which possibly led to improved sorptivity and mechanical properties.
Metadata
Item Type: | Proceedings Paper |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 25 Feb 2020 11:43 |
Last Modified: | 30 Mar 2020 15:37 |
Status: | Published |
Publisher: | Whittles Publishing |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157613 |