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Prediction of the diffusivity of cement-based materials using a three-dimensional spatial distribution model
Title: | Prediction of the diffusivity of cement-based materials using a three-dimensional spatial distribution model |
Authors: | Kiyofumi, Kurumisawa Browse this author →KAKEN DB | Toyoharu, Nawa Browse this author →KAKEN DB | Hitoshi, Owada Browse this author |
Keywords: | Microstructure | Diffusion coefficient | Backscattered electron image | Imageanalysis | Micro-indentation |
Issue Date: | Mar-2012 |
Publisher: | Elsevier |
Journal Title: | Cement and Concrete Composites |
Volume: | 34 |
Issue: | 3 |
Start Page: | 408 |
End Page: | 418 |
Publisher DOI: | 10.1016/j.cemconcomp.2011.11.011 |
Abstract: | A three-dimensional image of hardened cement paste was reconstructed using a backscattered electron image (BEI) and used to predict the diffusion properties of hardened cement paste. After the BEI observations, an autocorrelation function (ACF) was calculated for each phase of the hardened cement paste, including the unhydrated cement, portlandite, and large pores. A three-dimensional image was reconstructed on the basis of the ACF based on random distributions. The dynamic elastic modulus and diffusion coefficient were calculated using a finite-element or finite difference method with the reconstructed three-dimensional images. The elastic modulus of the C-S-H phase was determined by micro-indentation, and the diffusivity of C-S-H was calculated using this elastic modulus based on previous reports. The resulting predicted dynamic elastic moduli and diffusion coefficients were in good agreement with the experimental results. Although, it was observed that the predicted values of the diffusivity of the blended cement pastes is different from the measured values, a new relationship between diffusivity and porosity of C-S-H in blended cement pastes was developed in this study. |
Relation: | http://www.sciencedirect.com/science/journal/09589465 |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/48140 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 胡桃澤 清文
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