中国工程科学2025，Vol.27Issue(3)：129-141,13.DOI:10.15302/J-SSCAE-2025.04.013
全再生混凝土大跨梁的变形性能与低碳评价
Deformation Behavior and Low-Carbon Assessment of Large-Span Beam with Fully Recycled Concrete
摘要
Abstract
As global construction solid wastes surged and to achieve the carbon peak and carbon neutrality goals,the application of fully recycled coarse aggregate concrete(FRCAC,100%replacement rate)in structural engineering has emerged as a breakthrough solution to addressing resource-environmental constraints and reshaping low-carbon structural systems.However,current codes and standards lack long-term empirical data under actual service conditions,constraining technological updates and large-scale application.This study aims to break technological bottlenecks,drive code upgrades,and promote low-carbon application.It explores the service performance of FRCAC structures using a 30-meter-span simply supported beam as the engineering prototype.Under self-weight loading,the maximum compressive stress at the edge of the compression zone of FRCAC is approximately 50%of its axial compressive strength,simulating the stress state under actual loading conditions,thus enabling quantitative analysis of performance evolution mechanisms and low-carbon benefits under long-term coupled effects of mechanical loading and environmental exposure.Through designing comparative beams with equivalent reinforcement and water-to-binder ratios between FRCAC and conventional concrete,we established a comprehensive framework covering material preparation,component behaviors,and carbon benefit quantification.We tracked deformations,crack patterns,and carbonation depth evolution over 4-year service periods,and quantified carbon absorption effects using life cycle assessment models.Results demonstrate that although FRCAC exhibits 7.8%～14%reduced elastic modulus under the same-condition curing,pre-cambering completely compensates deformation discrepancies,satisfying structural requirements.While bending cracks increased by 8%and the crack length increased by 15%,the average width remained comparable to conventional concrete.Considering service-period carbon absorption,FRCAC beams achieved 7.69%reduction in net carbon emissions.This study pioneers engineering prototype validation of FRCAC's feasibility under actual load-environment coupling conditions.The findings are expected to advance the transformation of construction wastes from extensive landfilling to high-value utilization,providing a forward-looking solution for low-carbon structural engineering.关键词
全再生粗骨料混凝土/30 m跨度工程原型梁/动态监测/生命周期评价/碳排放Key words
fully recycled coarse aggregate concrete(FRCAC)/30-meter-span engineering prototype beam/dynamic monitoring/life cycle assessment/carbon emissions分类
建筑与水利引用本文复制引用
肖建庄,宁甲乾,何尧,丁陶,肖绪文,潘玉珀,王春晖,房海波,梁汝鸣,葛序尧,王璞瑾,关湘烁,徐浩林..全再生混凝土大跨梁的变形性能与低碳评价[J].中国工程科学,2025,27(3):129-141,13.基金项目
国家重点研发计划项目(2022YFC3803401) （2022YFC3803401）
中国工程院咨询项目"绿色建造发展战略研究"(2022-XZ-21) National Key R&D Program of China(2022YFC3803401) （2022-XZ-21）
Chinese Academy of Engineering project"Research on Green Construction Development Strategy"(2022-XZ-21) （2022-XZ-21）
