文献类型：期刊文献

英文题名：Properties evaluation of concrete made with recycled coarse aggregate modified by graphene oxide

作者：Wang, Qidong[1];Zhao, Hanbing[2];Luo, Zhiyu[3];Liu, Shuguang[4];Zhou, Changshun[1];Liu, Hongxin[1]

机构：[1]Shaoxing Univ, Yuanpei Coll, Shaoxing 312000, Peoples R China;[2]Univ Technol Sydney, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia;[3]Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117567, Singapore;[4]Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China

年份：2024

卷号：84

外文期刊名：JOURNAL OF BUILDING ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001163947800001)、、EI(收录号：20240415430683)、Scopus(收录号：2-s2.0-85182873947)、WOS

基金：Acknowledgements This work was financially supported by the National Natural Science Foundation of Zhejiang province (Grant No. LHY22E080001) .

语种：英文

外文关键词：Graphene oxide; Recycled aggregate concrete; Chloride ion permeability; Porosity; Micromechanical properties

外文摘要：Previous application of graphene oxide (GO) in recycled aggregate concrete (RAC) is the direct replacement of cement or binder to achieve performance improvement. To develop a more efficient recycled aggregate (RA) modification technique and improve the properties of the corresponding RAC, this paper performed GO solution pre-spraying and pre-soaking treatment on RA. The modification efficiency of GO was evaluated by compressive strength, interfacial transition zone (ITZ) properties, and chloride ion permeability of RAC. The results show that the prespraying and pre-soaking methods improved the compressive strength of RAC at different ages by 20%-28.6 % and 8.3%-30.8 %, respectively. The GO-modified RAC also exhibited lower electric flux in the chloride ion permeability tests. However, no significant effect was observed on the elastic modulus of RAC. The modified RAC showed lower total porosity and harmful pore content. Meanwhile, the GO-modified ITZ between old and new mortar had denser hydration products. As a result, the elastic modulus and hardness of the ITZ increased by 27.8%-65.8 % and 9.8%-107 %, respectively, while the width of the ITZ decreased by 15.4%-30.8 %. The good filling and nucleation effect of GO were credited with the enhancement mechanism of RA by prespraying and pre-soaking methods.