• 文献标题:   Mechanical properties and microstructure of a graphene oxide-cement composite
  • 文献类型:   Article
  • 作  者:   PAN Z, HE L, QIU L, KORAYEM AH, LI G, ZHU JW, COLLINS F, LI D, DUAN WH, WANG MC
  • 作者关键词:   graphene oxide, portland cement, compressive strength, flexural strength, microstructure
  • 出版物名称:   CEMENT CONCRETE COMPOSITES
  • ISSN:   0958-9465 EI 1873-393X
  • 通讯作者地址:   Monash Univ
  • 被引频次:   176
  • DOI:   10.1016/j.cemconcomp.2015.02.001
  • 出版年:   2015

▎ 摘  要

Graphene oxide (GO) is the product of chemical exfoliation of graphite. Due to its good dispersibility in water, high aspect ratio and excellent mechanical properties, GO is a potential candidate for use as nanoreinforcements in cement-based materials. In this paper, GO was used to enhance the mechanical properties of ordinary Portland cement paste. The introduction of 0.05 wt% GO can increase the GO-cement composite compressive strength by 15-33% and the flexural strength by 41-59%, respectively. Scanning electron microscope imaging of the GO-cement composite shows the high crack tortuosity, indicating that the two-dimensional GO sheet may form a barrier to crack propagation. Consequently, the GO-cement composite shows a broader stress-strain curve within the post-peak zone, leading to a less sudden failure. The addition of GO also increases the surface area of the GO-cement composite. This is attributed to increasing the production of calcium silicate hydrate. The results obtained in this investigation suggest that GO has potential for being used as nano-reinforcements in cement-based composite materials. (C) 2015 Elsevier Ltd. All rights reserved.