文献类型：期刊文献

英文题名：In-situ 4D CT analysis of microcrack evolution in carbonated fiber-reinforced recycled aggregate concrete

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

机构：[1]Shanghai Univ, Sch Mech & Engn Sci, Dept Civil Engn, Shanghai, 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：163

外文期刊名：CEMENT & CONCRETE COMPOSITES

收录：SCI-EXPANDED(收录号：WOS:001513717200001)、、EI(收录号：20252318561005)、Scopus(收录号：2-s2.0-105007325912)、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) , and the Key Projects of Science & Technology Pillar Program of Henan Province (152102310027) .

语种：英文

外文关键词：Carbonation; Fiber-reinforced recycled aggregate concrete; In-situ 4D CT scanning; Microcrack evolution; Pore structure

外文摘要：This study employs in-situ 4D computed tomography (CT) to investigate the microcrack evolution in carbonated fiber-reinforced recycled aggregate concrete (CFRAC). Through 2D slice comparison and 3D reconstruction at six loading stages, the progression of pore structure and crack development under uniaxial compression is visualized. Carbonation is found to significantly reduce porosity (by similar to 20 %) and improve ITZ compactness, enhancing compressive strength by similar to 30 %. The incorporation of 2.0 % steel fibers effectively delays crack propagation and reduces crack connectivity. Quantitative analysis reveals the spatial-temporal evolution of microcracks and demonstrates the fiber-bridging effect in resisting crack growth. These findings offer insights into the durability and structural behavior of CFRAC and support its sustainable application in concrete structures.