期刊
NANOTECHNOLOGY REVIEWS
卷 10, 期 1, 页码 768-778出版社
DE GRUYTER POLAND SP Z O O
DOI: 10.1515/ntrev-2021-0055
关键词
graphene; graphene oxide; cement paste; C-S-H; calcium ion; hydration
类别
资金
- National Nature Science Foundation of China [51925802, 52008119]
- Natural Science Foundation of Guangdong Province [2019A1515110799, 2021A1515012624]
- 111 Project [D21021]
Graphene and graphene oxide have been shown to significantly improve the mechanical properties of cement-based materials by accelerating the nucleation and growth of C-S-H on the cement surface. The presence of high mobility ions derived by graphene in the cement paste enhances the interaction between the cement surface and ions, facilitating the hydration of cement.
Graphene (G) and graphene oxide (GO) have been shown to significantly improve the mechanical properties of cement-based materials. In this study, the effect of the G/GO on cement hydration was investigated. First, the zeta potential of G/GO in simulated solutions was tested, and the interaction between G/GO's surface and Ca2+ was explored. Subsequently, scanning electron microscopy was used to observe the morphology of C-S-H nucleation and growth on the cement surface in the cement paste containing G/GO. Furthermore, XRD and TGA analyses were carried out on the hydration products of the sample. At last, isothermal calorimetry was applied to investigate the influence of G/GO on the early hydration of cement. The results showed that the addition of G/GO significantly accelerates C-S-H nucleation and growth on the cement surface. It is indicated that the high mobility ions derived by G/GO in the cement paste dominate the reason for the accelerated hydration of cement. The presence of G, especially GO, facilitates the mobility of ions, especially Ca2+, thus enhances the interaction between the cement surface and the ions. This strong interaction promotes the C-S-H nucleation and growth, and therefore, the hydration of the cement.
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