Volume 25 Issue 6
Dec.  2025
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YANG Jian, LUO Jun-wei, CHEN Bao-chun, LUO Xia, SUN Tong-qing, WANG Wen-rong. Brittleness coefficient and compressive strength design value of ultra-high performance concrete[J]. Journal of Traffic and Transportation Engineering, 2025, 25(6): 51-60. doi: 10.19818/j.cnki.1671-1637.2025.06.005
Citation: YANG Jian, LUO Jun-wei, CHEN Bao-chun, LUO Xia, SUN Tong-qing, WANG Wen-rong. Brittleness coefficient and compressive strength design value of ultra-high performance concrete[J]. Journal of Traffic and Transportation Engineering, 2025, 25(6): 51-60. doi: 10.19818/j.cnki.1671-1637.2025.06.005
shu

Brittleness coefficient and compressive strength design value of ultra-high performance concrete

doi: 10.19818/j.cnki.1671-1637.2025.06.005
  • 1.

    Hubei Key Laboratory of Disaster Prevention and Mitigation, Yichang 430070, Hubei, China

  • 2.

    College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, Hubei, China

  • 3.

    College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China

  • 4.

    School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China

  • 5.

    CCCC SHEC Wuhan Harbour New Materials Co., Ltd., Wuhan 430040, Hubei, China

Funds:

National Natural Science Foundation of China for Young Scientists Project 52508206

Postdoctoral Innovation Project of Hubei Province 52508206

More Information
  • Corresponding author: YANG Jian (1990-), male, lecturer, PhD, 845175145@qq.com
  • Received Date: 2024-12-30
  • Accepted Date: 2025-05-06
  • Rev Recd Date: 2025-03-05
  • Publish Date: 2025-12-28
    Abstract
  • Two groups of experimental studies (group Ⅰ and group Ⅱ) were carried out to investigate the brittle coefficient and compressive strength design value of ultra-high performance concrete (UHPC). Specifically, group Ⅰ test carried out the flexural test of notched beams for 11 kinds of UHPC with commonly employed strength grades in engineering, tested the fracture toughness, and indirectly derived the brittleness coefficient of UHPC for each strength grade by adopting it as the opposite index of the brittleness coefficient. Group Ⅱ test studied the shape effect of compressive strength test via compression tests on 15 batches of UHPC prismatic and cubic specimens, and integrated the experimental data with relevant literature data at home and abroad to build a database. Meanwhile, numerical analysis was carried out to determine the compressive strength ratio of UHPC standard prismatic and standard cubic specimens. Experimental results show that under the same compressive strength grade, the UHPC toughness is significantly enhanced with the improving tensile performance grade. As the specimen size increases, the strength ratio between prismatic and cubic specimens (or shape effect) gradually intensifies, but the growth trend tends to be gentle. By employing the experimental data as the basis and comprehensively referring to the method for determining brittleness coefficients in current relevant standards, the recommended brittleness coefficient values applicable to UHPC of various grades were proposed. Numerical analysis shows that the compressive strength ratio of UHPC standard prismatic specimens to standard cubic specimens is 0.89. By referring to the method for determining the compressive strength design value of ordinary concrete, and combining the determined brittleness coefficient and shape effect coefficient, the recommended compressive strength design values for 11 commonly employed UHPC strength grades were put forward, thus providing experimental basis and coefficient support for the improvement of UHPC structural design codes.

     

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