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Development of Reactive MgO Cement-Silica Fume–Based Strain-Hardening Engineered Cementitious Composite.
- Source :
-
Journal of Materials in Civil Engineering . Oct2023, Vol. 35 Issue 10, p1-12. 12p. - Publication Year :
- 2023
-
Abstract
- MgO-based cementitious materials have attracted increasing attentions due to their advantages of low energy consumption, fire resistance, and low CO2 emission. This study develops a new reactive MgO cement (RMC)-silica fume (SF) engineered cementitious composite (ECC). The effects of RMC∶SF 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 1∶1 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 MgCO3 , it greatly reduces its ductility. A large amount of brucite and M─ S─ H gels were generated under room temperature curing with plastic wrap. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08991561
- Volume :
- 35
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Journal of Materials in Civil Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 169940809
- Full Text :
- https://doi.org/10.1061/JMCEE7.MTENG-15016