文献类型：期刊文献

英文题名：Effect of graphene oxide on strength and interfacial transition zone of recycled aggregate concrete

作者：Qidong, Wang[1];Changshun, Zhou[1];Xudong, Wang[1];Zixuan, An[1];Yeke, Luo[2]

机构：[1]Shaoxing Univ, Yuanpei Coll, Shaoxing 312000, Peoples R China;[2]Zhejiang Ind Polytech Coll, Shaoxing 312000, Peoples R China

年份：2022

卷号：9

期号：7

外文期刊名：MATERIALS RESEARCH EXPRESS

收录：SCI-EXPANDED(收录号：WOS:000828876400001)、、EI(收录号：20223112473347)、Scopus(收录号：2-s2.0-85135140888)、WOS

基金：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：recycled concrete; graphene oxide; mechanical properties; pore structure; interface 18 transition zone

外文摘要：This paper studies the effect of graphene oxide (GO) on the strength and interface transition zone of recycled aggregate concrete (RAC). The results show that the addition of GO enhances the RAC strength, and the compressive strength of the sample containing GO is improved by 7% similar to 20.6% at 28 days, compared with the reference group. Meanwhile, with the addition of GO, the total porosity and the number of harmful pores (> 100 nm) of RAC samples decreased by 8.1% similar to 35.7% and 3% similar to 39.1%, respectively. It is observed from the nano scale characteristics that the addition of GO can significantly reduce pore phase and unhydrated phase content in the matrix, and increase the volume fraction of C-S-H phase, especially the high-density C-S-H phase. In addition, the width of the interface transition zone between old mortar and new mortar containing GO sample is relatively reduced by 25%, but there is no obvious change in the interface transition zone of old aggregate mortar. The strengthening effect of GO on RAC strength is due to the nucleation of GO and the filling effect of micro-aggregate, improving the pore structure and interface transition zone of RAC.