Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 190, Issue -, Pages 1163-1172Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.09.131
Keywords
Specific surface area; Fly ash; Image analysis; Laser diffraction; Blaine air permeability; Nitrogen absorption
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Funding
- Japan Society for the Promotion of Science [17H01284]
- Grants-in-Aid for Scientific Research [17H01284] Funding Source: KAKEN
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The specific surface area (SSA) of fly ash has a significant effect on its pozzolanic reactivity and on the performance of fly ash-blended concrete. Because fly ash contains a considerable amount of irregularly shaped particles and unburned carbon, determination of an accurate SSA is analytically troublesome by conventional methods. Various methods for determining the SSA of fly ash are evaluated and compared in this study, including Blaine air permeability, nitrogen absorption testing, laser diffraction testing and image analysis. The experimental results show that Blaine air permeability and laser diffraction testing tend to underestimate the SSA of fly ash because they involve the assumption of perfectly spherical particle geometry. The SSA determined by nitrogen absorption testing is found to be associated with a significant overestimation induced by unburned carbon. Image analysis coupled with BSE appears to give consistent results and appears to be the most promising method of determining an accurate value for absolute SSA. (C) 2018 Elsevier Ltd. All rights reserved.
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