Potential application of geopolymers as protection coatings for marine concrete II. Microstructure and anticorrosion mechanism

Zhang, Zuhua and Yao, Xiao and Zhu, Huajun (2010) Potential application of geopolymers as protection coatings for marine concrete II. Microstructure and anticorrosion mechanism. Applied Clay Science , 49 (1/2). pp. 7-12. ISSN 0169-1317

Abstract

The excellent anticorrosion property of geopolymers in sea water and their efficient bonding to hardened cement paste did not only depend on the chemical compositions but were also influenced by the microstructure. This study presents an investigation into the interfaces between the geopolymer and cement paste and mortar and the pore structure of geopolymers by scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and Brunauer–Emmett–Teller (BET) nitrogen adsorption. The interface between the geopolymer and cement paste was compact and its chemical composition changed due to the reaction between the geopolymer slurry and the surface of cement. Open pores in the geopolymer synthesized with 90% metakaolin (MK) and 10% granulated blast furnace slag (GBFS) were < 15 nm in an average, thus much smaller than the average open pore size in ordinary Portland cement (OPC) paste. The compact microstructure of the geopolymer made it difficult for sea water to penetrate. The amorphous aluminosilicate geopolymeric gels, which were chemically stable in sea water or in air, provided a sustainable protection for marine concrete structures.


Statistics for USQ ePrint 25661
Statistics for this ePrint Item
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 04:20
Last Modified: 25 Aug 2014 05:51
Uncontrolled Keywords: geopolymer; anticorrosion; interface; microstructure; marine concrete
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.2010.04.024
URI: http://eprints.usq.edu.au/id/eprint/25661

Actions (login required)

View Item Archive Repository Staff Only