Chen, Meng;
Wang, Yuting;
Zhang, Tong;
Zhang, Mingzhong;
(2023)
Behaviour of structural engineered cementitious composites under dynamic tensile loading and elevated temperatures.
Engineering Structures
, 280
, Article 115739. 10.1016/j.engstruct.2023.115739.
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Abstract
This paper presents a systematic study on dynamic splitting tensile properties of polyvinyl alcohol (PVA) fibre reinforced engineered cementitious composites (ECC) after exposure to elevated temperatures up to 800 °C under strain rates of 4.34 to 10.95 s−1. A series of tests were conducted to characterise the weight loss, elastic modulus, uniaxial tensile properties, static and dynamic splitting tensile behaviour, and pore pressure, as well as the chemical and microstructural evolution of ECC. Results indicate that the dynamic splitting tensile properties of ECC went up with the increasing strain rate regardless of heated temperatures due to strain rate effect. The dynamic splitting strength, dynamic increase factor and energy dissipation of ECC reached the maximum values at 105 °C, which can be ascribed to the enhanced fibre-matrix bond and further hydration of fly ash. However, the dynamic tensile properties of ECC reduced at over 250 °C due to the melting of PVA fibres, thermally induced microcracks and dehydration of hydration products. At 800 °C, the dynamic splitting tensile strength and dissipated energy of ECC dropped by 81.0–83.2% and 88.4–89.1% over the measured strain rate range, relative to that at 20 °C. In addition, the main role for resisting dynamic loading was gradually transferred from fibre debonding-elongating action to crack propagation at over 400 °C. Accordingly, the failure patterns of ECC changed from tensile failure with the main central crack to coupled tensile-shear failure with multiple cracks.
| Type: | Article |
|---|---|
| Title: | Behaviour of structural engineered cementitious composites under dynamic tensile loading and elevated temperatures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.engstruct.2023.115739 |
| Publisher version: | https://doi.org/10.1016/j.engstruct.2023.115739 |
| 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: | Fibre reinforced concrete, Strain-hardening cementitious composites, Tensile behaviour, Dynamic properties, Thermal resistance, Microstructure |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science 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/10164607 |
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