Study on the Steel Fiber Toughening Effect Based on the Uniaxial Tensile Toughness of UHPC
YANG Jian1,2,*, LI Xiaolong1,2, CHEN Xude3, XU Jiayang3, XU Gang1,2, MA Xilun4, LUO Junwei1,2
1 Hubei Key Laboratory of Disaster Prevention and Mitigation, Yichang 443002, Hubei, China 2 College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, Hubei, China 3 State Grid UHV Project Construction Co., Ltd, Beijing 100032, China 4 School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
Abstract: This work systematically investigated the uniaxial tensile toughness of ultra-high performance concrete (UHPC) and the toughening effects of steel fibers through two experimental groups (group I and group II). Group I conducted uniaxial tensile and flexural tests on 11 kinds of UHPC specimens of different grades. By referencing methods for establishing flexural toughness indices in standards CECS 13-2009 and ASTM C1018, uniaxial tensile toughness indices (It20, It30, It40) were established. The test results indicate that while flexural toughness can indirectly characterize tensile toughness, comparable and accurate results are only achieved when specimens share the same compressive strength grades. When compressive strengths differ significantly, flexural toughness values are strongly influenced by ultra-high compressive strengths, making them unable to accurately reflect tensile toughness. Conversely, uniaxial tensile toughness, derived directly from uniaxial tensile tests, is unaffected by compressive strengths and provides a more direct and precise measure of the material’s tensile toughness. Group II performed uniaxial tensile toughness tests on 19 kinds of UHPC mixes incorporating steel fibers with varying aspect ratios and volume fractions. The test results revealed that uniaxial tensile toughness increases with higher aspect ratios or volume fractions, but the rate of increase slows down. Notably, a decline in uniaxial tensile toughness was observed when the fiber volume fraction exceeded 2.5%. To quantitatively analyze the toughening effect of steel fibers, a “uniaxial tensile toughening coefficient” was formulated. Using the response surface method (RSM), a predictive formula for this coefficient was developed. Verification based on literature data confirmed the prediction formula’s good accuracy within the ranges of aspect ratios ≤100 and volume fractions ≤3.0%. Finally, the reliability of the prediction model was enhanced through the model parameters optimization by integrating all experimental and literature data.
杨简, 李晓龙, 陈绪德, 徐嘉阳, 徐港, 马熙伦, 罗俊伟. 基于UHPC直拉韧性的钢纤维增韧效应研究[J]. 材料导报, 2026, 40(10): 25050023-10.
YANG Jian, LI Xiaolong, CHEN Xude, XU Jiayang, XU Gang, MA Xilun, LUO Junwei. Study on the Steel Fiber Toughening Effect Based on the Uniaxial Tensile Toughness of UHPC. Materials Reports, 2026, 40(10): 25050023-10.
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