文献类型：期刊文献

英文题名：Determining the importance of recycled aggregate characteristics affecting the elastic modulus of concrete by modeled recycled aggregate concrete: Experiment and numerical simulation

作者：Liang, Chaofeng[1,2];Bao, Jiani[1];Gu, Feng[1];Lu, Jingyi[1];Ma, Zhiming[1];Hou, Shaodan[1];Duan, Zhenhua[3]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing, Peoples R China;[2]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Zhejiang, Peoples R China;[3]Tongji Univ, Dept Struct Engn, Shanghai, Peoples R China

年份：2025

卷号：162

外文期刊名：CEMENT & CONCRETE COMPOSITES

收录：SCI-EXPANDED(收录号：WOS:001498100700001)、、EI(收录号：20252018443647)、Scopus(收录号：2-s2.0-105005204966)、WOS

基金：The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (52479129) , the sci-ence and technology plan project of Shaoxing City (2023B43003) and the Natural Science Foundation of Zhejiang Province (LGF22E080035, LTGS24E080007) .

语种：英文

外文关键词：Elastic modulus; Stress-strain curve; Modeled recycled aggregate concrete; Interface transition zone; Numerical simulation

外文摘要：Elastic modulus is one of the key parameters of recycled concrete for its application as structural concrete. The effect of recycled coarse aggregate characteristics on concrete elastic modulus needs to be clarified to enhance concrete performance. This study investigated the effect of the properties of recycled coarse aggregate, new mortar, and interfacial transition zone (ITZ) on concrete elastic modulus by using modeled recycled aggregate concrete (MRAC). Results from experiments and numerical simulation were compared and analyzed quantitatively. The results showed that the elastic modulus and peak stress of MRAC increased linearly with the increase of the elastic modulus of natural aggregate and old mortar in recycled coarse aggregate and new mortar but decreased linearly with the increase of old mortar volume fraction. Compared with other factors, the old mortar elastic modulus had the greatest effect on the characteristic parameters of MRAC under compression. When the old mortar elastic modulus increased from 28.1 GPa to 33.4 GPa, the elastic modulus, peak stress and peak strain increased by 17.2 %, 31.2 % and 34.7 %, respectively. The results obtained from numerical simulation were consistent with experimental results. In terms of stress-strain curve, peak stress, and elastic modulus, numerical simulation results revealed that the changes of ITZ width and elastic modulus had insignificant effect (lower than 8.9 %) on them, this was attributed to the limited volume fraction of ITZ in MRAC from the theoretical analysis. These findings provided a framework for optimizing treatment protocols aimed at enhancing the elastic modulus of recycled aggregate concrete.