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A platform for research: civil engineering, architecture and urbanism
Multiscale investigation of tensile properties of a TiO2-doped Engineered Cementitious Composite
Highlights 5% TiO2 in ECC saturates air-purification ability while preserving tensile properties. The optimized TiO2-doped ECC sustains a tensile strain capacity of 4.0%. Alterations in tensile properties of ECC by TiO2 are understood by micromechanics. Both site effect and dilution effect are operative in ECC when TiO2 is added.
Abstract Engineered Cementitious Composites (ECC) provides a unique platform to develop high-performance and multifunctional construction materials with strain-hardening properties and exceptional crack control capability. ECC incorporating titanium dioxide (TiO2) nanoparticles has intrinsically embodied photocatalytic properties, such as air-purifying functionality. However, there remains a lack of fundamental knowledge on how the presence of TiO2 nanoparticles affects fiber/matrix interface and macro tensile properties of ECC. There is a need to establish a holistic understanding of the role of TiO2 nanoparticles in ECC at multiple scales. To this end, this study experimentally investigates the effect of TiO2 content (up to 15% of binder) on the fiber/matrix interface and on the tensile properties of ECC. A micromechanical model is used to link the multiscale material properties and interpret the test data of the TiO2-doped ECC. Results show that changes in the macroscopic tensile properties as a result of TiO2 addition can be traced back to the matrix and fiber/matrix interface properties. The research findings provide insights into the underlying mechanisms of tensile property modifications by TiO2 nanoparticles, as well as establishing a reference for the design of photocatalytic ECC for balanced functional and mechanical properties.
Multiscale investigation of tensile properties of a TiO2-doped Engineered Cementitious Composite
Highlights 5% TiO2 in ECC saturates air-purification ability while preserving tensile properties. The optimized TiO2-doped ECC sustains a tensile strain capacity of 4.0%. Alterations in tensile properties of ECC by TiO2 are understood by micromechanics. Both site effect and dilution effect are operative in ECC when TiO2 is added.
Abstract Engineered Cementitious Composites (ECC) provides a unique platform to develop high-performance and multifunctional construction materials with strain-hardening properties and exceptional crack control capability. ECC incorporating titanium dioxide (TiO2) nanoparticles has intrinsically embodied photocatalytic properties, such as air-purifying functionality. However, there remains a lack of fundamental knowledge on how the presence of TiO2 nanoparticles affects fiber/matrix interface and macro tensile properties of ECC. There is a need to establish a holistic understanding of the role of TiO2 nanoparticles in ECC at multiple scales. To this end, this study experimentally investigates the effect of TiO2 content (up to 15% of binder) on the fiber/matrix interface and on the tensile properties of ECC. A micromechanical model is used to link the multiscale material properties and interpret the test data of the TiO2-doped ECC. Results show that changes in the macroscopic tensile properties as a result of TiO2 addition can be traced back to the matrix and fiber/matrix interface properties. The research findings provide insights into the underlying mechanisms of tensile property modifications by TiO2 nanoparticles, as well as establishing a reference for the design of photocatalytic ECC for balanced functional and mechanical properties.
Multiscale investigation of tensile properties of a TiO2-doped Engineered Cementitious Composite
Xu, Mingfeng (author) / Bao, Yi (author) / Wu, Kai (author) / Shi, Huisheng (author) / Guo, Xiaolu (author) / Li, Victor C. (author)
Construction and Building Materials ; 209 ; 485-491
2019-03-11
7 pages
Article (Journal)
Electronic Resource
English
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