Durability of alkali-activated fly ash concrete: chloride penetration in pastes and mortars
Article
Article Title | Durability of alkali-activated fly ash concrete: chloride penetration in pastes and mortars |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Zhu, Huajun (Author), Zhang, Zuhua (Author), Zhu, Yingcan (Author) and Tian, Liang (Author) |
Journal Title | Construction and Building Materials |
Journal Citation | 65, pp. 51-59 |
Number of Pages | 9 |
Year | 2014 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2014.04.110 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S095006181400436X |
Abstract | 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. |
Keywords | alkali-activated materials; chloride penetration; concrete; durability; geopolymers; pore structure |
ANZSRC Field of Research 2020 | 400505. Construction materials |
340399. Macromolecular and materials chemistry not elsewhere classified | |
401602. Composite and hybrid materials | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Yancheng Institute of Technology, China |
Centre of Excellence in Engineered Fibre Composites | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q26q5/durability-of-alkali-activated-fly-ash-concrete-chloride-penetration-in-pastes-and-mortars
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