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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Residual properties of ultra-high performance concrete containing steel-polypropylene hybrid fiber exposed to elevated temperature at early age
AU - Wang, T.
AU - Yu, M.
AU - Tian, J.
AU - Sun, Z.
AU - Yu, C.
AU - Ye, J.
N1 - Export Date: 18 December 2024 Correspondence Address: Yu, M.; School of Civil Engineering, China; email: ceyumin@whu.edu.cn Funding details: National Natural Science Foundation of China, NSFC, 52178157 Funding details: National Natural Science Foundation of China, NSFC Funding text 1: This study was supported financially by the National Natural Science Foundation of China (Grant NO.52178157).
PY - 2025/4/1
Y1 - 2025/4/1
N2 - To investigate residual properties of Ultra-High Performance Concrete (UHPC) containing steel-polypropylene hybrid fiber subjected to fire accidents during construction, uniaxial compressive tests were carried out on UHPC exposed to elevated temperature at early age. The test parameters include the age exposed to elevated temperature, temperature levels, steel fiber content and coarse aggregate content. Based on the test results, failure mode, strength, elastic modulus, peak strain, and strain-stress response of the tested specimens were analyzed. Additionally, microstructures of the specimens were characterized using X-ray diffraction and scanning electron microscopy. The test results show that up to 600 °C, the residual compressive strength of the UHPC generally increases with age due to the improved resistance and accelerated hydration. At 800 °C, the strength decreases slightly with age due to the porosity and carbonation reactions. Finally, an empirical formula was proposed to predict the compressive strength, peak strain, elastic modulus, and the uniaxial compressive stress-strain constitutive model of the UHPC exposed to elevated temperature at early age.
AB - To investigate residual properties of Ultra-High Performance Concrete (UHPC) containing steel-polypropylene hybrid fiber subjected to fire accidents during construction, uniaxial compressive tests were carried out on UHPC exposed to elevated temperature at early age. The test parameters include the age exposed to elevated temperature, temperature levels, steel fiber content and coarse aggregate content. Based on the test results, failure mode, strength, elastic modulus, peak strain, and strain-stress response of the tested specimens were analyzed. Additionally, microstructures of the specimens were characterized using X-ray diffraction and scanning electron microscopy. The test results show that up to 600 °C, the residual compressive strength of the UHPC generally increases with age due to the improved resistance and accelerated hydration. At 800 °C, the strength decreases slightly with age due to the porosity and carbonation reactions. Finally, an empirical formula was proposed to predict the compressive strength, peak strain, elastic modulus, and the uniaxial compressive stress-strain constitutive model of the UHPC exposed to elevated temperature at early age.
KW - Early age
KW - Elevated temperatures
KW - Residual performance
KW - Steel-polypropylene hybrid fiber
KW - Ultra-high performance concrete
KW - Compression testing
KW - Polypropylenes
KW - Stress-strain curves
KW - Elevated temperature
KW - Exposed to
KW - High-performance concrete
KW - Hybrid fiber
KW - Peak strains
KW - Residual properties
KW - Ultra high performance
KW - Steel fibers
U2 - 10.1016/j.jobe.2024.111507
DO - 10.1016/j.jobe.2024.111507
M3 - Journal article
VL - 99
JO - Journal of Building Engineering
JF - Journal of Building Engineering
SN - 2352-7102
M1 - 111507
ER -