文献类型：期刊文献

英文题名：Computed tomography images and digital volume correlation analysis of microstructural damage evolution in carbonated recycled aggregate concrete

作者：Wang, Changqing[1,4];Lu, Yuelan[1];Zhang, Youchao[2];Wu, Huixia[3];Ma, Zhiming[2]

机构：[1]Shanghai Univ, Sch Mech & Eng Sci, Dept Civil Eng, Shanghai 200444, Peoples R China;[2]Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[4]Tongji Univ, Coll Civil Engn, Dept Bldg Engn, Shanghai 200092, Peoples R China

年份：2025

卷号：491

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001538702400005)、、EI(收录号：20253018826464)、Scopus(收录号：2-s2.0-105011078187)、WOS

基金：The authors wish to acknowledge the financial support from the National Natural Science Foundation of China (NSFC) through Grant No. (51608383) , China Postdoctoral Science Foundation through Grant Nos. (2014M550247) and (2015T80449) , Natural Science Foundation of Shanghai Municipality through Grant No. (25ZR1401128) , and the Key Projects of Science & Technology Pillar Program of Henan Province (152102310027) .

语种：英文

外文关键词：Carbonated high-toughness recycled aggregate; concrete; In-situ 4D computed tomography; Digital volume correlation; Microdamage evolution; Strain localization

外文摘要：The sustainable application of recycled aggregate concrete (RAC) is hindered by its inherent mechanical deficiencies and vulnerability to microcracking. This study employs in-situ 4D computed tomography (CT) and digital volume correlation (DVC) to dynamically characterize the three-dimensional strain localization and multiscale damage evolution in carbonated high-toughness recycled aggregate concrete (CHTRAC) under uniaxial compression. Results demonstrate that carbonation reduces porosity by 28.5 % (from 10.83 % to 7.74 %) through CaCO3 precipitation, optimizing interfacial transition zone (ITZ) cohesion and elevating compressive strength to 38.56 MPa. Micro-steel fibers (2.0 % volume fraction, 120 mu m diameter) enhance toughness by 40 % via crack bridging, suppressing strain localization, and delaying crack penetration. Quantitative analysis reveals a nonlinear relationship between loading stages and damage metrics: crack volume fraction grows exponentially, while residual strength retains 65 % of peak stress post-failure. A three-stage constitutive model ('elasticity-damage-softening') was developed, and its validity was confirmed through strain statistical indices and DVCderived displacement fields. This work bridges microstructural evolution to macroscopic performance, offering a paradigm for designing eco-friendly, high-toughness RAC with reduced COQ emissions.