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Thaumasite form of sulfate attack in limestone cement mortars: A study on long term efficiency of mineral admixtures

Skaropoulou, A., Tsivilis, S., Kakali, G., Sharp, J. and Swamy, R. (2009) Thaumasite form of sulfate attack in limestone cement mortars: A study on long term efficiency of mineral admixtures. Construction and Building Materials, 23 (6). pp. 2338-2345. ISSN 0950-0618

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Abstract

Concrete and mortar made from limestone cement may exhibit a lack of durability due to the formation of thaumasite. The addition of minerals that improve the concrete durability is expected to slow down the formation of thaumasite. in this work the effect of natural pozzolana, fly ash, ground granulated blast-furnace slag and metakaolin on the thaumasite formation in limestone cement mortar is examined. A limestone cement, containing 15% w/w limestone, was used. Mortar specimens were prepared by replacing a part of limestone cement with the above minerals. The specimens were immersed in a 1.8% MgSO4 solution and cured at 5 and 25 degrees C. The status of the samples after a storage period of 5 years was reported based on visual inspection, compressive strength, mass measurements, ultrasonic pulse velocity measurements and analytical techniques. It is concluded that the use of specific minerals, as partial replacement of cement, inhibits thaumasite formation in limestone cement mortar. (C) 2008 Elsevier Ltd. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Elsevier. This is an author produced version of a paper subsequently published in Construction and Building Materials. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Portland limestone cement; Mineral admixtures; Long-term performance; Sulfate attack; Thaumasite
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 23 Jul 2009 09:46
Last Modified: 15 Sep 2014 01:35
Published Version: http://dx.doi.org/10.1016/j.conbuildmat.2008.11.00...
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.conbuildmat.2008.11.004
URI: http://eprints.whiterose.ac.uk/id/eprint/8900

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