A comparative study on the pore structure of alkali-activated fly ash evaluated by mercury intrusion porosimetry, N2 adsorption and image analysis

Article

Ma, Y., Wang, G., Ye, G. and Hu, J.. 2018. "A comparative study on the pore structure of alkali-activated fly ash evaluated by mercury intrusion porosimetry, N2 adsorption and image analysis." Journal of Materials Science. 53 (8), pp. 5958-5972. https://doi.org/10.1007/s10853-017-1965-x
Article Title

A comparative study on the pore structure of alkali-activated fly ash evaluated by mercury intrusion porosimetry, N2 adsorption and image analysis

ERA Journal ID4930
Article CategoryArticle
AuthorsMa, Y. (Author), Wang, G. (Author), Ye, G. (Author) and Hu, J. (Author)
Journal TitleJournal of Materials Science
Journal Citation53 (8), pp. 5958-5972
Number of Pages15
Year2018
Place of PublicationNew York, United States
ISSN0022-2461
1573-4803
Digital Object Identifier (DOI)https://doi.org/10.1007/s10853-017-1965-x
Abstract

In this study, the pore structure of alkali-activated fly ash (AAFA) pastes characterized by different techniques, including mercury intrusion porosimetry (MIP), nitrogen adsorption and image analysis (based on backscattered electron images), was evaluated and compared critically. The degree of reaction of fly ash in AAFA pastes was derived from image analysis. It was found that due to a significant 'ink-bottle' effect, the pore diameter of capillary pores derived from MIP was two orders of magnitude smaller than the size determined by image analysis. MIP and nitrogen adsorption results showed different peaks corresponding to the gel pores of AAFA pastes. Based on the experimental results, image analysis is regarded as a reliable technique for the characterization of large pores (> 1 μm) in AAFA pastes. Nitrogen adsorption is more suitable to characterize small pores (< 0.1 μm) in AAFA than MIP, and MIP data should be carefully interpreted, preferably in combination with other characterization techniques.

Keywordsdistributions; technology; ratio
ANZSRC Field of Research 2020400505. Construction materials
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Byline AffiliationsCentre for Future Materials
Guangzhou University, China
Delft University of Technology, Netherlands
South China University of Technology, China
Institution of OriginUniversity of Southern Queensland
Funding source
Australian Research Council (ARC)
Grant ID
1006016
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https://research.usq.edu.au/item/q5934/a-comparative-study-on-the-pore-structure-of-alkali-activated-fly-ash-evaluated-by-mercury-intrusion-porosimetry-n2-adsorption-and-image-analysis

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