Potential application of geopolymers as protection coatings for marine concrete I. Basic properties

Zhang, Zuhua and Yao, Xiao and Zhu, Huajun (2010) Potential application of geopolymers as protection coatings for marine concrete I. Basic properties. Applied Clay Science, 49 (1/2). pp. 1-6. ISSN 0169-1317

Abstract

Coatings can extend the service life of concrete structures exposed to marine environments by inhibiting the intrusion of corrosive ions. In the present paper, the possibility of using geopolymer as an innovative inorganic coating for marine concrete protection was evaluated by 5 basic properties: setting time, permeability, anticorrosion and bond strength as well as volume stability. Fresh coat needed about 2h to finally set at 25°C. A compound geopolymer was developed by adding 10% granulated blast furnace slag (GBFS) in metakaolin as starting materials at the liquid/solid ratio of 0.60 ml/g. The presence of GBFS had a beneficial effect on reducing the permeability of the geopolymer. Although the strength development was
relatively slower under the condition of seawater curing, it convincingly confirmed that geopolymer had excellent anticorrosion property. Furthermore, the average bond strength between geopolymer and cement paste or between geopolymer and mortar was higher than 1.5 MPa, which could be explained by the coexistence of calcium silicate hydrate (C–S–H) gels in cement and geopolymer matrix under strong alkaline condition. In addition, the large shrinkage of the geopolymer was controlled by using polypropylene (PP)
fiber and self-prepared MgO expansion agent, later of which could produce a shrinkage compensating effect.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2010 Elsevier B.V. Permanent restricted access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 31 Jul 2014 04:37
Last Modified: 25 Aug 2014 05:50
Uncontrolled Keywords: marine concrete; anticorrosion; coating; geopolymer
Fields of Research : 09 Engineering > 0911 Maritime Engineering > 091199 Maritime Engineering not elsewhere classified
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Identification Number or DOI: 10.1016/j.clay.2010.01.014
URI: http://eprints.usq.edu.au/id/eprint/25666

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