Development of Reactive MgO Cement-Silica Fume–Based Strain-Hardening Engineered Cementitious Composite
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 10
Abstract
MgO-based cementitious materials have attracted increasing attentions due to their advantages of low energy consumption, fire resistance, and low emission. This study develops a new reactive MgO cement (RMC)-silica fume (SF) engineered cementitious composite (ECC). The effects of mass ratio, fiber type, fiber content, and curing conditions on the mechanical properties and strain-hardening behavior of the RMC-SF ECC are investigated. The hydration characteristics of RMC-SF ECC under different curing conditions were studied through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) analysis. It was found that the RMC-SF ECC obtained a tensile strain capacity of 5.7%. Polyethylene (PE) fibers achieved higher compressive strength, and polyvinyl alcohol (PVA) fibers yielded better tensile strain capacity. A RMC-SF mass ratio of obtained a higher ductility under high temperature curing at 50°C. Although carbon dioxide curing improves the mechanical properties of RMC-SF ECC due to the formation of , it greatly reduces its ductility. A large amount of brucite and M─ S─ H gels were generated under room temperature curing with plastic wrap.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was funded by the Natural Science Foundation of Hebei Province (E2022201011), Science and Technology Project of Hebei Education Department (QN2022067), Science and Technology Project of Hebei Provincial Department of Human Resources and Social Security (C20220309), and High-level Innovative Talents Program of Hebei University (521100221036). Thanks to the University of Canterbury for the experimental materials and test platform.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 10 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jun 8, 2022
Accepted: Mar 10, 2023
Published online: Jul 26, 2023
Published in print: Oct 1, 2023
Discussion open until: Dec 26, 2023
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