Impact of gamma-ray irradiation on hardened white Portland cement pastes exposed to atmosphere
Impact of gamma-ray irradiation on hardened white Portland cement pastes exposed to atmosphere
复制标题
伽马射线照射对暴露于大气中的硬化白色波特兰水泥浆体的影响
DOI：
10.1016/j.cemconres.2018.03.005
复制
发表时间：
2018
影响因子：
11.4
通讯作者：
Osamu Kontani
中科院分区：
文献类型：
--
作者：
Ippei Maruyama;Shunsuke Ishikawa;Junichi Yasukouchi;Shohei Sawada;Ryo Kurihara;Masayuki Takizawa;Osamu Kontani
将成熟硬化水泥浆体样品暴露于γ射线照射的环境中，这会诱导自然碳酸化过程。在约5 × 104 kGy的剂量后，将辐照硬化水泥浆体样品的物理性质、微观结构和相组成与暴露于相同环境而没有γ射线辐照的参考样品的物理性质、微观结构和相组成进行比较。实验证实，在辐照下优先形成文石和球文石，并且γ射线辐照后抗弯强度显著增加。基于场发射扫描电子显微镜观察，X射线散射剖面，和水蒸气吸附等温线数据，它的结论是，球文石上形成的C-S-H起到了加强C-S-H的结构通过赝象的作用。
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 5 × 104kGy, 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.