Wang, Y;
Chen, M;
Zhang, T;
Zhang, M;
(2025)
Rheology and mechanical properties of limestone calcined clay based engineered cementitious composites with nano CaCO_{3}.
Cement and Concrete Composites
, 157
, Article 105923. 10.1016/j.cemconcomp.2025.105923.
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Abstract
The application of advanced binder consisting of limestone, calcined clay and cement (LC3) promotes the development of low-carbon engineering cementitious composites (ECC). In order to improve the comprehensive properties of LC3-ECC, this paper investigates the feasibility of using nano CaCO3 (NC) to replace the limestone powder up to 20 % for LC3-ECC preparation through rheology and mechanical tests along with the micro-design calculation and microstructure analysis. Results indicate that the yield stress and plastic viscosity of LC3-ECC are largely improved with increasing NC replacement rate. Meanwhile, the compressive, flexural and tensile strengths of LC3-ECC with NC raise firstly and then decline, while the strengths are maximum at NC replacement rate of 5 % but the tensile strain capacity remains at 2.3 %. The hydration promotion effect and pore structure refinement effect of NC particles improve the mechanical strength of LC3-ECC, but the performance degradation occurs when the replacement rate of the NC exceeds 10 %. In micromechanics, the fibre bridging stress of LC3-ECC reinforced by NC with replacement rate of 5 % decreases by 18.5 % compared to that of without NC, but it grows with the increasing NC replacement rate. In combination with fresh, hardened and microstructure behaviour, LC3-ECC exhibits the optimum mechanical behaviour with the NC replacement rate of 10 %–15 %.
| Type: | Article |
|---|---|
| Title: | Rheology and mechanical properties of limestone calcined clay based engineered cementitious composites with nano CaCO_{3} |
| DOI: | 10.1016/j.cemconcomp.2025.105923 |
| Publisher version: | https://doi.org/10.1016/j.cemconcomp.2025.105923 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Engineered cementitious composites, Limestone calcined clay cement, Nano CaCO3, Rheology, Strain hardening behaviour, Micromechanics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10204921 |
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