Impact of gamma-ray irradiation on hardened white Portland cement pastes exposed to atmosphere

被引：50

作者：

Maruyama, Ippei ^{[1
]}

Ishikawa, Shunsuke ^{[2
,3
]}

Yasukouchi, Junichi ^{[3
]}

Sawada, Shohei ^{[3
]}

Kurihara, Ryo ^{[2
]}

Takizawa, Masayuki ^{[4
]}

Kontani, Osamu ^{[3
]}

机构：

[1] Nagoya Univ, Grad Sch Environm Studies, Chikusa Ku, ES Bldg,546 Furo Cho, Nagoya, Aichi 4648603, Japan

[2] Nagoya Univ, Grad Sch Environm Studies, Nagoya, Aichi, Japan

[3] Kajima Corp, Nucl Power Dept, Tokyo, Japan

[4] Mitsubishi Res Inst Inc, Nucl Safety Div, Tokyo, Japan

来源：

CEMENT AND CONCRETE RESEARCH | 2018年 / 108卷

关键词：

Gamma-ray irradiation; Carbonation (C); Calcium-silicate-hydrate (C-S-H) (B); Physical properties (C); C-S-H; SURFACE-AREA; WATER-VAPOR; ALUMINUM INCORPORATION; CALCIUM-CARBONATE; DRYING SHRINKAGE; COLLOID MODEL; CONCRETE; STRENGTH; AL-27;

D O I：

10.1016/j.cemconres.2018.03.005

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 x 10(4) 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.

引用

页码：59 / 71

页数：13

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