A comparison of the specific surface area of fly ash measured by image analysis with conventional methods

Wang, Tiao1; Ishida, Testuya1; Gu, Rui2

2018-11-30

10.1016/j.conbuildmat.2018.09.131

CONSTRUCTION AND BUILDING MATERIALS   影响因子和分区

0950-0618

1879-0526

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.

Specific surface area Fly ash Image analysis Laser diffraction Blaine air permeability Nitrogen absorption

SCI ; EI

英语

其他

Japan Society for the Promotion of Science[17H01284]

Construction & Building Technology ; Engineering ; Materials Science

Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary

WOS:000451104900100

ELSEVIER SCI LTD

20184005905385

Air permeability ; Carbon ; Diffraction ; Fly ash ; Nitrogen ; Specific surface area

Chemical Products Generally:804 ; Physical Properties of Gases, Liquids and Solids:931.2

MATERIALS SCIENCE

Web of Science

1.Univ Tokyo, Sch Engn, Dept Civil Engn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
2.Southern Univ Sci & Technol, Mat Characterizat & Preparat Ctr, Shenzhen 518055, Peoples R China

Wang, Tiao,Ishida, Testuya,Gu, Rui. A comparison of the specific surface area of fly ash measured by image analysis with conventional methods[J]. CONSTRUCTION AND BUILDING MATERIALS,2018,190:1163-1172.

Wang, Tiao,Ishida, Testuya,&Gu, Rui.(2018).A comparison of the specific surface area of fly ash measured by image analysis with conventional methods.CONSTRUCTION AND BUILDING MATERIALS,190,1163-1172.

Wang, Tiao,et al."A comparison of the specific surface area of fly ash measured by image analysis with conventional methods".CONSTRUCTION AND BUILDING MATERIALS 190(2018):1163-1172.