Graphene oxide nano-engineered recycled aggregate concrete for sustainable construction: A critical review

Graphene oxide (GO) has been generally accepted can improve the microstructure of concrete because it can promote cement hydration, this nano-enhancement strategy is valuable for improving the weak interfacial transition zone in recycled aggregate concrete (RAC). This paper review aims to provide a comprehensive understanding and comparison of the impact of GO on the performance and microstructure of RAC through various modification methods. Initially, the characteristics of GO and its utilization in preparing RAC are introduced. Subsequently, the effects of admixing GO on the performance of RAC and its roles within the RAC system are analyzed and discussed. Furthermore, an economic, environmental evaluation, and research limitations of GO-modified RAC are analyzed. Finally, the conclusions and potential research prospects for future investigations are outlined. The findings of this review have the potential to expand the understanding of GO-modified RAC and can serve as a source of inspiration for future research endeavors.