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<p>The excellent mechanical properties of ultra-high performance concrete (UHPC) will reduce the cross-sectional size of UHPC beams, resulting in a decrease in the amount of UHPC and the carbon emission. However, the large amount of cement in UHPC can lead to significant carbon emissions during the production process. Few existing studies have paid attention to the relationship between the mechanical properties of UHPC beams and carbon emissions. In this study, a 30 m prestressed UHPC beam was taken as the research object. Based on the analysis of the actual force, a cross-section and reinforcement scheme considering its mechanical properties was formulated. The influence of material ratio and different design parameters on its bending moment capacity was then analyzed. Additionally, a carbon emission calculation model for the entire life cycle of the UHPC beam was constructed, and the carbon emissions of the 30 m UHPC beam under different material ratios were obtained. On this basis, the carbon strength of UHPC beams was introduced and analyzed. The results show that the structural carbon strength of the 30 m UHPC beam is better when the fiber volume fraction is 2%, the reinforcement ratio is 1.3%, and the UHPC compressive strength is between 140–160 MPa. In addition, a formula for calculating the structural carbon strength of the 30 m UHPC beam with different material ratios was obtained by machine learning. Through the formula, the carbon emissions in the entire life cycle of the 30 m UHPC beam after meeting the requirements of the bending moment capacity can be determined.</p>

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Life-cycle low-carbon design and assessment of UHPC beams integrating flexural capacity requirements

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月16日

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  • Yuqing Hu,
  • Qi Zhu,
  • Xiaolei Wang,
  • Ning Zhang,
  • Liping Tang,
  • Jingquan Wang

摘要

The excellent mechanical properties of ultra-high performance concrete (UHPC) will reduce the cross-sectional size of UHPC beams, resulting in a decrease in the amount of UHPC and the carbon emission. However, the large amount of cement in UHPC can lead to significant carbon emissions during the production process. Few existing studies have paid attention to the relationship between the mechanical properties of UHPC beams and carbon emissions. In this study, a 30 m prestressed UHPC beam was taken as the research object. Based on the analysis of the actual force, a cross-section and reinforcement scheme considering its mechanical properties was formulated. The influence of material ratio and different design parameters on its bending moment capacity was then analyzed. Additionally, a carbon emission calculation model for the entire life cycle of the UHPC beam was constructed, and the carbon emissions of the 30 m UHPC beam under different material ratios were obtained. On this basis, the carbon strength of UHPC beams was introduced and analyzed. The results show that the structural carbon strength of the 30 m UHPC beam is better when the fiber volume fraction is 2%, the reinforcement ratio is 1.3%, and the UHPC compressive strength is between 140–160 MPa. In addition, a formula for calculating the structural carbon strength of the 30 m UHPC beam with different material ratios was obtained by machine learning. Through the formula, the carbon emissions in the entire life cycle of the 30 m UHPC beam after meeting the requirements of the bending moment capacity can be determined.