Ukpata, JO, Basheer, PAM orcid.org/0000-0002-0835-8029 and Black, L orcid.org/0000-0001-8531-4989 (2018) Effects of temperature and curing duration on the stability of slag cements in combined chloride-sulphate environments. In: Durability of Concrete Structures Sixth International Conference on - ICDCS 2018. 6th International Conference on on Durability of Concrete Structures, 18-20 Jul 2018, University of Leeds, Leeds, UK. Whittles Publishing , Dunbeath, Caithness, UK , pp. 105-110. ISBN 9781849953948
Abstract
This experimental study investigates the effects of temperature and curing duration on the stability of slag blended cement systems exposed at 20 °C and 38 °C to combined sodium chloride (30 g/L)-sodium sulphate (3 g/L) solutions. Two slags, designated as slag 1 and 2, having CaO/SiO2 ratios of 1.05 and 0.94, were respectively blended with Portland cement CEM I 52.5R at 30 wt.% replacement level. Mortar prisms and cubes with w/b ratio of 0.5 and binder/aggregate ratio of 1:3 were then prepared for length and mass changes. The samples were cured in lime water for either 7 or 28 days before ponding for a total exposure period of 544 days. Analogous paste samples were also prepared to follow changes in the hydration products using X-ray diffraction (XRD). The results showed that curing at 38°C resulted in less expansion and prolonged curing generally reduced expansion except for slag 1 blend at 20 °C. Also, mass-change was minimal at 38 °C compared to 20 °C, and curing up to 28 days further improved mass stability. There was a positive correlation between mass change and length change for the period of investigation.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © ICDCS 2018. All rights reserved.This is an author produced version of a paper published in Durability of Concrete Structures Sixth International Conference on - ICDCS 2018 Uploaded with permission from the publisher. |
Dates: |
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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) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 May 2020 11:01 |
Last Modified: | 22 May 2020 09:30 |
Published Version: | https://www.whittlespublishing.com/ICDCS |
Status: | Published |
Publisher: | Whittles Publishing |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:160053 |