| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7884674 | Cement and Concrete Research | 2018 | 13 Pages |
Abstract
Samples of matured hardened cement paste were exposed to an environment with gamma-ray irradiation, which induces a natural carbonation process. After a dose of approximately 5â¯Ãâ¯104â¯kGy, the physical properties, microstructure, and phase composition of the irradiated hardened cement paste samples are compared with those of reference samples exposed to an identical environment without gamma-ray irradiation. Experiments confirm that aragonite and vaterite are preferentially formed under irradiation and that the bending strength is dramatically increased after gamma-ray irradiation. Based on field-emission scanning electron microscopy observations, X-ray scattering profiles, and water vapor sorption isotherm data, it is concluded that vaterite formed on C-S-H plays a role in strengthening the structure of C-S-H via pseudomorphs.
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Authors
Ippei Maruyama, Shunsuke Ishikawa, Junichi Yasukouchi, Shohei Sawada, Ryo Kurihara, Masayuki Takizawa, Osamu Kontani,