Influences of cementitious capillary crystalline waterproofing on the hydration products and properties of cement-based materials

被引：3

作者：

Zhong, Jingru ^{[1
]}

Zhang, Huaxian ^{[2
]}

Mao, Juejue ^{[3
]}

Zhang, Yanlin ^{[4
]}

Lian, Songsong ^{[5
]}

Wang, Jiaze ^{[4
]}

Zhou, Hangjie ^{[4
]}

Song, Yufeng ^{[4
]}

Hu, Jiawen ^{[6
]}

Wu, Haihua ^{[6
]}

Ruan, Shaoqin ^{[4
]}

机构：

[1] Zhejiang Commun Construct Jinzhu Transportat Const, Hangzhou 310051, Peoples R China

[2] Zhejiang Univ, Zhejiang Jiaogong Joint Res Ctr Collaborat Innovat, Hangzhou 310058, Peoples R China

[3] Zhejiang Engn Res Ctr Highway Digital Intelligence, Hangzhou 310058, Peoples R China

[4] Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China

[5] NingboTech Univ, Sch Civil Engn, Ningbo 315100, Peoples R China

[6] TCC Guigang Cement Co Ltd, Qingyuan 513000, Guangdong, Peoples R China

来源：

JOURNAL OF BUILDING ENGINEERING | 2024年 / 98卷

关键词：

Cementitious capillary crystalline; waterproofing; Self-healing; Physical composition; Microscopic morphology; Pore structure; SELF-HEALING CAPABILITY; MECHANICAL-PROPERTIES; CONCRETE; COMPOSITES; PERMEABILITY; TRANSPORT;

D O I：

10.1016/j.jobe.2024.111451

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Admixtures and curing conditions affect the self-healing ability of concrete. In this research, various doses of XYPEX-type CCCW and self-healing treatments via internal and external doping were administered. The mechanical characteristics, mineral phases, and pore structures of the samples were unveiled, with the self-healing process assessed through strength tests and a series of microscopic characterizations. The outcomes revealed that concrete specimens incorporating 2 % internal CCCW exhibited the most effective self-healing effect (similar to 114.4 %). The enhancement in specimen mechanical properties correlated with microstructure refinement, resulting in increased hydration product generation, microcrack filling, and diminished macropore spaces. These findings underscore CCCW's superior reactivity compared to cement particles, emphasizing the advantages of a moderate internal CCCW admixture in prolonging concrete lifespan. Furthermore, the self-healing rate of the specimens is contingent on the diffusion rate of Ca2+ across the concrete's boundary layer and CaCO3. Elevated calcium ion concentrations precipitate denser boundary layer growth, hindering calcium ion penetration for self-healing.

引用

页数：15

共 67 条

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