Visualization and quantification of solute diffusivity in cracked concrete by X-ray CT

M. Henry, T. Sugiyama, I. S. Darma

研究成果: Paper

1 引用 (Scopus)

抜粋

This paper explores the usage of microfocus X-ray computed tomography (CT) for visualization and quantification of diffusion phenomena in cracked concrete. Mortar specimens of varying shapes (prismatic and cylindrical), crack types (artificial and splitting tensile), and binder compositions (OPC and fly ash) were prepared. Cesium carbonate (Cs2CO3) was used as a tracer in the diffusion test because it has high X-ray absorption due to its high atomic number and thus contrasts with mortar and air voids in the CT images. Image processing and analysis was carried out to visualize and quantify the diffusion behavior in 3D space. In addition, the profile of the solute concentration in cracked mortar was determined based on the measured CT numbers. Fick's second law could then be used to determine the diffusion coefficient of the solute. It was found that the diffusion coefficients along the crack were on the scale of 10-8 to 10-11 m2/s, which implies that the transport mechanism along the crack was not solely by diffusion but controlled by the degree of saturation as well as the crack opening width. Diffusivity in the uncracked matrix, however, was reduced to the scale of 10-12 m2/s. Fly ash mortar exhibited a lower diffusion coefficient in the uncracked matrix compared with the OPC mortar with an equivalent crack opening width.

元の言語English
ページ205-211
ページ数7
DOI
出版物ステータスPublished - 2014
外部発表Yes
イベント4th International Conference on the Durability of Concrete Structures, ICDCS 2014 - West Lafayette, IN, United States
継続期間: 2014 7 242014 7 26

Conference

Conference4th International Conference on the Durability of Concrete Structures, ICDCS 2014
United States
West Lafayette, IN
期間14/7/2414/7/26

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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  • これを引用

    Henry, M., Sugiyama, T., & Darma, I. S. (2014). Visualization and quantification of solute diffusivity in cracked concrete by X-ray CT. 205-211. 論文発表場所 4th International Conference on the Durability of Concrete Structures, ICDCS 2014, West Lafayette, IN, United States. https://doi.org/10.5703/1288284315403