Durability of alkali-activated fly ash concrete: chloride penetration in pastes and mortars

Zhu, Huajun and Zhang, Zuhua and Zhu, Yingcan and Tian, Liang (2014) Durability of alkali-activated fly ash concrete: chloride penetration in pastes and mortars. Construction and Building Materials, 65. pp. 51-59. ISSN 0950-0618


Durability of alkalis-activated fly ash (AAFA) concretes is of vital concern for their commercial application. This study investigates the durability in the aspect of chloride penetration in AAFA pastes and mortars in comparison with Portland cement. A coarse fly ash with 0-40% substitution by a granulated blast furnace slag were used to prepared AAFA pastes and mortars at liquid/solid ratio of 0.6-0.8 (in mass). It was observed that at the same grade of compressive strength, even higher, the unsaturated AAFA paste and mortar had higher Cl- penetration rate than Portland cement paste and mortar. Only the mortars with the liquid/solid ratio of 0.6 and the mortar with 40% slag substitution exhibited similar Cl- penetration rate as the cement mortar at w/c of 0.5. The pore structure analysis showed that the porosity and tortuosity are the two most significant factors affecting the Cl- penetration. This study underlines the important roles of the natural properties of fly ash, liquid/solid ratio and slag substitution in the development of durable AAFA concrete.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 Elsevier Ltd. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 29 May 2014 06:36
Last Modified: 04 Jul 2016 04:51
Uncontrolled Keywords: alkali-activated materials; chloride penetration; concrete; durability; geopolymers; pore structure
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030606 Structural Chemistry and Spectroscopy
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
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.conbuildmat.2014.04.110
URI: http://eprints.usq.edu.au/id/eprint/25259

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