Durability performances of wollastonite, tremolite and basalt fiber-reinforced metakaolin geopolymer composites under sulfate and chloride attack

Ren, Daming and Yan, Chunjie and Duan, Ping and Zhang, Zuhua and Li, Lingyao and Yan, Zhongyun (2017) Durability performances of wollastonite, tremolite and basalt fiber-reinforced metakaolin geopolymer composites under sulfate and chloride attack. Construction and Building Materials, 134. pp. 56-66. ISSN 0950-0618

Abstract

This paper aims to investigate the durability related performances of geopolymer composite materials that synthesized by alkali activation of metakaolin (MK) with reinforcement of wollastonite (WS), tremolite (TR) and short basalt fiber (SBF). The resulting geopolymer composites were exposed to sodium sulfate (Na2SO4) solutions (concentration 5–20%) and sodium chloride (NaCl) solution (concentration 5–20%). The compressive strengths, morphological evolution, microstructure and pore structure of the geopolymer composite specimens were examined to evaluate their durability performance. The result showed that the mix of a MK with addition of 5% WS, 5% TR, and 2% SBF exhibits the highest compressive strength in the studied range of mixture design. The compressive strength of geopolymer composites decreased with increasing of the concentration of Na2SO4 and NaCl solutions, and with the extension of exposure period as well. The average pores size of geopolymer shifted from 22 nm to 92 nm after the sulfate exposure, and the total porosity also increased. This is in agreement with the compressive strength development. The findings of this study suggest that reinforcement by mineral particles and fibers is an effective approach to increase the compressive strength of geopolymer; and it is also beneficial to the enhancement of the resistance to sulfate and chloride attack.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 19 Oct 2017 06:01
Last Modified: 17 Apr 2018 23:16
Uncontrolled Keywords: Geopolymer; Metakaolin; Durability; Sulfate attack; Chloride attack; Mineral particles; Fiber
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Funding Details:
Identification Number or DOI: 10.1016/j.conbuildmat.2016.12.103
URI: http://eprints.usq.edu.au/id/eprint/31060

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