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Title: Spalling resistance and mechanical properties of strain-hardening ultra-high performance concrete at elevated temperature
Authors: Zhang, Dong
Liu, Yuchen
Tan, Kang Hai
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: Zhang, D., Liu, Y. & Tan, K. H. (2021). Spalling resistance and mechanical properties of strain-hardening ultra-high performance concrete at elevated temperature. Construction and Building Materials, 266(Part B), 120961-.
Project: L2NICCFP1-2013-4 
Journal: Construction and Building Materials
Abstract: This study aimed to investigate fire resistance of strain hardening ultra-high performance concrete (SHUHPC). A series of mechanical tests, spalling tests, thermal analysis, and microscopic observation were conducted. Polypropylene (PP) fibers of different dosages were adopted to mitigate spalling of SHUHPC. The finding showed that SHUHPC showed severe spalling even with 1.5 vol% polyethylene (PE) fibers. PE fibers were ineffective in spalling prevention. Creation of empty channels by PE fibers after exposure to 200 °C did not lead to a good spalling resistance of SHUHPC. To prevent spalling of SHUHPC, a dosage of 0.3 vol% of PP fibers was required. High thermal expansion of PP fibers before melting allowed the PP fibers to create microcracks in concrete and to enhance permeability at 150 °C, resulting in good spalling resistance of SHUHPC. Further, partially replacing PE fibers by PP fibers negatively affected tensile properties of SHUHPC at ambient temperature. Besides, the compressive of SHUHC was not affected by different proportions of PE and PP fibers at ambient temperature and high temperature.
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2020.120961
Schools: School of Civil and Environmental Engineering 
Rights: © 2020 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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