Investigation of mixing techniques for full-strength-grade engineered cementitious composites (ECCs): Mechanical properties and microstructure

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Minjin Cai
  • Hehua Zhu
  • Timon Rabczuk
  • Xiaoying Zhuang

Research Organisations

External Research Organisations

  • Tongji University
  • Bauhaus-Universität Weimar
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Details

Original languageEnglish
Article number110136
Number of pages19
JournalJournal of Building Engineering
Volume95
Early online date5 Jul 2024
Publication statusPublished - 15 Oct 2024

Abstract

Mixing techniques significantly influence the performance of ECC by affecting both macro- and microstructural properties. Despite its importance, research on ECC mixing techniques remains limited, restricting broader exploration and application. This study investigates the effects of three mixing techniques using pan, handheld, and planetary mixers on the performance of full-strength-grade ECC, focusing on flowability, compressive strength, elasticity, tensile and flexural properties, and fiber bridging ability. CT scan-based 3D reconstructions provided insights into pore and fiber distribution. The findings indicate minimal variations in flowability, compressive strength, and elasticity across mixer types, all within 10 % of optimal performance. However, tensile strength showed significant variability at higher strength levels, with pan mixers exhibiting up to 72.25 % performance drop, while handheld mixers showed reductions of up to 25.78 %. Flexural performance remained robust across all mixers, with pan and handheld mixers achieving over 82 % and 92 % of the performance seen with planetary mixers, respectively. While porosity was similar across mixers at identical strength levels, pore size diversity increased with higher strength levels. Additionally, fiber distribution varied significantly. Planetary mixers achieved superior uniformity, whereas pan mixers exhibited significant clustering. These results provide a quantitative assessment of the mixing performance of different mixers, offering valuable guidance for both research and practical engineering applications.

Keywords

    3D reconstruction, CT scan, Fiber distribution, Mixing techniques, Pore structure

ASJC Scopus subject areas

Cite this

Investigation of mixing techniques for full-strength-grade engineered cementitious composites (ECCs): Mechanical properties and microstructure. / Cai, Minjin; Zhu, Hehua; Rabczuk, Timon et al.
In: Journal of Building Engineering, Vol. 95, 110136, 15.10.2024.

Research output: Contribution to journalArticleResearchpeer review

Cai M, Zhu H, Rabczuk T, Zhuang X. Investigation of mixing techniques for full-strength-grade engineered cementitious composites (ECCs): Mechanical properties and microstructure. Journal of Building Engineering. 2024 Oct 15;95:110136. Epub 2024 Jul 5. doi: 10.1016/j.jobe.2024.110136
Cai, Minjin ; Zhu, Hehua ; Rabczuk, Timon et al. / Investigation of mixing techniques for full-strength-grade engineered cementitious composites (ECCs) : Mechanical properties and microstructure. In: Journal of Building Engineering. 2024 ; Vol. 95.
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