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Author:

Sun, Dawei (Sun, Dawei.) | Ma Wenxu (Ma Wenxu.) | Ma Jikun (Ma Jikun.) | Yan, Jianhua (Yan, Jianhua.) | Mao Qianjin (Mao Qianjin.) | Wang Yali (Wang Yali.) | Wang Jianfeng (Wang Jianfeng.) | Lan, Mingzhang (Lan, Mingzhang.) | Wang, Ziming (Wang, Ziming.) | Cui, Suping (Cui, Suping.) (Scholars:崔素萍) | Wang, Zhiyong (Wang, Zhiyong.) (Scholars:王智勇)

Indexed by:

EI Scopus SCIE

Abstract:

The application of self-healing property to cement-based materials promoted a long-term service time in engineering. In this study, dimethyl thio-toluene diamine (DMTDA) microcapsules were synthesized successfully through melting-dispersion-condensation techniques, and enabled crack closure thus recovering the mechanical property. The as-fabricated DMTDA microcapsules showed a core-shell structure and well-dispersed properties with a tailorable core fraction and diameter, (e.g., a diameter of 312.7 +/- 97.6 mu m and a shell thickness of 15.2 +/- 2.6 mu m under agitation rate of 300 RPM). It was found that DMTDA microcapsules had a high core fraction and good thermal stability. The introduction of microcapsules decreased the flowability of cement paste but remained integral structures during the mechanical agitation. The increase of microcapsule concentrations led to a significant drop in porosity but a slight decrease in compressive strength of cement paste. Most importantly, the addition of DMTDA microcapsules and isocyanates microcapsules in the cement paste could repair the early hydration cracks with a size less than 100 mu m, thereafter achieving a satisfying recovery of the compressive strength.

Keyword:

Isocyanates Compressive strength Amine microcapsules Crack recovery Self-healing cement paste

Author Community:

  • [ 1 ] [Sun, Dawei]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Ma Wenxu]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Ma Jikun]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Yan, Jianhua]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Mao Qianjin]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Wang Yali]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Wang Jianfeng]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 8 ] [Lan, Mingzhang]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 9 ] [Wang, Ziming]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 10 ] [Cui, Suping]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 11 ] [Wang, Zhiyong]Beijing Inst Technol, Sch Mechatron Engn, Beijing 100081, Peoples R China

Reprint Author's Address:

  • 崔素萍

    [Cui, Suping]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

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Source :

CEMENT & CONCRETE COMPOSITES

ISSN: 0958-9465

Year: 2021

Volume: 122

1 0 . 5 0 0

JCR@2022

ESI Discipline: MATERIALS SCIENCE;

ESI HC Threshold:116

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 27

SCOPUS Cited Count: 30

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 7

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