Potential application of geopolymers as protection coatings for marine concrete III. Field experiment

Zhang, Zuhua and Yao, Xiao and Wang, Hao (2012) Potential application of geopolymers as protection coatings for marine concrete III. Field experiment. Applied Clay Science, 67-68. pp. 57-60. ISSN 0169-1317

Abstract

Previous studies have shown a high potential of using geopolymers as new inorganic coatings in protecting marine concrete. This article reports the results of the experiment on field application. Geopolymer coatings were in-situ applied on the surfaces of concrete accropodes along the coast. It was observed that the geopolymer coatings set within 4 hours, bound strongly with concrete and were able to resist the wave shock in the first tide rise. There was a modicum of calcite detected by X-ray diffraction (XRD) but no sulphate was found in the coatings within 6. months. One issue raised during in-situ application is the large shrinkage of the geopolymer paste under ambient condition. Micro-cracks on the surfaces were observed after 7. days although the MgO-based expansion agent and polypropylene (PP) fibers were added to withstand the shrinkage. The humidity of the atmosphere and the thickness of the coating layer are the two significant factors affecting the integrity of coatings. It was noted that the coating with a thickness of 5. mm at the tidal area, where contact with seawater periodically, exhibited the best integrity. To solve the problem of large shrinkage, it is recommended to use suitable aggregates in coating paste and to develop appropriate shrinkage reducing agents together with careful curing procedures.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 Elsevier B.V. Permanent restricted access to Published Version due to publisher copyright restrictions.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 06 Jan 2013 04:46
Last Modified: 31 Jul 2014 00:20
Uncontrolled Keywords: coating; field experiment; geopolymer; integrity; marine concrete
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0911 Maritime Engineering > 091101 Marine Engineering
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.2012.05.008
URI: http://eprints.usq.edu.au/id/eprint/21883

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