Possible pitfall in sample preparation for SEM analysis - A discussion of the paper “Fabrication of polycarboxylate/graphene oxide nanosheet composites by copolymerization for reinforcing and toughening cement composites” by Lv et al.
Journal article, 2017

This paper presents a discussion of the paper published by Lv et al. in Cement and Concrete Composites, 2016, 66: 1–9. The discussion is mainly focused on whether or not graphene oxide (GO) nanosheets can regulate formation of flower-like cement hydration crystals. Lv et al. in their paper proposed a regulation mechanism stating that GO nanosheets can control ettringite (AFt), monosulfate (AFm) and calcium hydroxide (CH) to form the flower-like and polyhedron crystals, whilst our experimental results show that there might be a possible pitfall in sample preparation for SEM analysis. It is here suggested that the main chemical components of flower-like and polyhedron crystals are calcium carbonates, which are not the products from cement hydration but from carbonation of cementitious hydrates. It is therefore suggested that further study is needed to verify the regulation mechanism of GO on cement hydration crystals proposed by Lv et al. in the discussed paper.

Cement hydration

Sample preparation

Calcium carbonate

Graphene oxide

Crystal morphology

Author

Hongzhi Cui

Shenzhen University

Xiantong Yan

Shenzhen University

Luping Tang

Chalmers, Civil and Environmental Engineering, Building Technology

F. Xing

Shenzhen University

Cement and Concrete Composites

0958-9465 (ISSN)

Vol. 77 81-85

Subject Categories

Civil Engineering

DOI

10.1016/j.cemconcomp.2016.12.007