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<p>This study aims to comprehensively evaluate the carbon footprint of cable-stayed bridges, which require significantly higher carbon inputs than other infrastructure types such as roads. Road construction emits only about 0.147&#xa0;kg of CO2 for every kilogram of CO2 emitted during bridge construction. Despite this disparity, there is a notable gap in research that comprehensively evaluates the carbon footprints of cable-stayed bridges. To fill this gap, we integrate Life Cycle Assessment (LCA) and the Low Emissions Analysis Platform (LEAP), tools often used independently, to provide a holistic evaluation of emissions and develop strategies for mitigation. By integrating LCA and LEAP, this study provides a comprehensive framework to guide the development of effective carbon reduction strategies in bridge construction, addressing both lifecycle and energy system impacts. This study develops a detailed lifecycle inventory of the materials and processes involved in constructing a typical cable-stayed bridge. Using LCA, baseline carbon emissions were calculated, revealing that during the material phase, steel had the largest impact on emissions: rebar steel accounted for 13.01%, other steel profiles contributed 67.97%, and diagonal cables made up 0.36% of total emissions. For the machinery, lifting equipment, essential for moving heavy bridge components, was another significant contributor, responsible for 25.06% of emissions. LEAP was employed to model various emission reduction scenarios, offering insights into strategies to minimise emissions throughout the bridge’s lifecycle. The findings highlight steel's critical role in driving emissions and underscore the need for optimised material use and energy-efficient construction practices.</p> Graphical abstract <p></p>

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Quantifying and scenario modelling carbon emissions in cable-stayed bridge construction: analysing materials production, transportation, and machinery use with openLCA and LEAP

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Xiaochun Qin,
  • Vicky Wangechi Wangari,
  • Gong Weiwei,
  • Li Qili,
  • Liu Jie

摘要

This study aims to comprehensively evaluate the carbon footprint of cable-stayed bridges, which require significantly higher carbon inputs than other infrastructure types such as roads. Road construction emits only about 0.147 kg of CO2 for every kilogram of CO2 emitted during bridge construction. Despite this disparity, there is a notable gap in research that comprehensively evaluates the carbon footprints of cable-stayed bridges. To fill this gap, we integrate Life Cycle Assessment (LCA) and the Low Emissions Analysis Platform (LEAP), tools often used independently, to provide a holistic evaluation of emissions and develop strategies for mitigation. By integrating LCA and LEAP, this study provides a comprehensive framework to guide the development of effective carbon reduction strategies in bridge construction, addressing both lifecycle and energy system impacts. This study develops a detailed lifecycle inventory of the materials and processes involved in constructing a typical cable-stayed bridge. Using LCA, baseline carbon emissions were calculated, revealing that during the material phase, steel had the largest impact on emissions: rebar steel accounted for 13.01%, other steel profiles contributed 67.97%, and diagonal cables made up 0.36% of total emissions. For the machinery, lifting equipment, essential for moving heavy bridge components, was another significant contributor, responsible for 25.06% of emissions. LEAP was employed to model various emission reduction scenarios, offering insights into strategies to minimise emissions throughout the bridge’s lifecycle. The findings highlight steel's critical role in driving emissions and underscore the need for optimised material use and energy-efficient construction practices.

Graphical abstract