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Title: Fire resistance of ultra-high performance strain hardening cementitious composite : residual mechanical properties and spalling resistance
Authors: Liu, Jin-Cheng
Tan, Kang Hai
Keywords: Engineering::Civil engineering
Strain Hardening
High Temperature
Issue Date: 2018
Source: Liu, J.-C., & Tan, K. H. (2018). Fire resistance of ultra-high performance strain hardening cementitious composite : residual mechanical properties and spalling resistance. Cement and Concrete Composites, 89, 62-75. doi:10.1016/j.cemconcomp.2018.02.014
Series/Report no.: Cement and Concrete Composites
Abstract: Ultra high performance strain hardening cementitious composites (UHP-SHCC) is a special type of cement-based composite material with outstanding mechanical and protective performance at room temperature. But its fire performance is unknown and there is a lack of research in this aspect. This study presents an experimental program to study fire resistance of UHP-SHCC under two aspects, viz. high-temperature explosive spalling resistance and residual mechanical performance after a fire. Both compressive strength and tensile strength of UHP-SHCC were found to deteriorate with increasing exposure temperature. Tensile strain-hardening feature of UHP-SHCC would be lost at 200 °C and above. It was found that PE fibers are found not effective in mitigating explosive spalling, although they start to melt at 144 °C. FE-SEM (Field Emission Scanning Electron Microscopy) and EDX (Energy Dispersive X-ray) techniques were used to study the state of fiber, fiber/matrix interaction, and microcracks development. Microscopic study found that melted PE fibers were still present in the cementitious matrix, and the melting did not introduce more microcracks. Furthermore, it was difficult for melted PE fibers to diffuse through the matrix, thus providing the reason that PE fibers did not mitigate explosive spalling in UHP-SHCC.
ISSN: 0958-9465
DOI: 10.1016/j.cemconcomp.2018.02.014
Rights: © 2018 Elsevier Ltd. All rights reserved. This paper was published in Cement and Concrete Composites and is made available with permission of Elsevier Ltd.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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