Abstract
Ultra-high performance concrete (UHPC) tends to crack and flake at high temperature, which causes the structure to lose its overall stability and collapse, posing a serious threat to people’s lives and property safety. In this study, by selecting the cementitious material and the high-temperature resistant aggregate, a new type of high-temperature resistant ultra-high performance concrete (HTR-UHPC) was successfully developed. The high temperature resistance tests of HTR-UHPC were systematically carried out at 5 different temperatures (20 ℃, 250 ℃, 500 ℃, 750 ℃, 1000 ℃). The compressive and axial tensile properties of the specimens were investigated after high temperatures, and the compressive and tensile stress–strain curves were obtained. High-temperature products and internal structures were tested by scanning electron microscopy (SEM) and X-ray diffractometry (XRD), respectively, and the microscopic mechanisms were revealed. The results showed that the mechanical properties of the HTR-UHPC had been significantly improved after heating at 500 ℃, 750 ℃, and 1000 ℃. When heated to 500 ℃, the compressive and tensile strength of HTR-UHPC retained 106 and 88% of the unheated status, respectively. While the structure of traditional UHPC was damaged, the compressive and tensile strength retained only 90 and 76%. Moreover, when heated to 750 ℃, the HTR-UHPC still maintained structural integrity. The residual compressive and tensile strength could still reach 115.83 and 6.17 MPa. During the hydration process, the HTR-UHPC did not generate calcium hydroxide, and the failure stress caused by high-temperature dehydration was small. At the same time, the ability of late crystal transition to reduce strength was suppressed by the addition of mineral admixtures, which enabled the formation of cracks and pores to be effectively suppressed. The stability and mechanical properties of the structure were maintained. Overall, these findings offer valuable insights into the influence of cementitious material system and high-temperature resistant aggregate on the mechanical properties of HTR-UHPC.
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Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Funding was provided by National Natural Science Foundation of China (Grant Nos. 52378243, 51978339).
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Wang, X., Zhang, W., Chen, R. et al. Study on preparation and mechanical properties of a new type of high-temperature resistant ultra-high performance concrete. Archiv.Civ.Mech.Eng 24, 115 (2024). https://doi.org/10.1007/s43452-024-00930-9
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DOI: https://doi.org/10.1007/s43452-024-00930-9