Proposed mechanism for the enhanced microstructure of graphene oxide–Portland cement composites

被引：23

作者：

Basquiroto de Souza F. ^{[1
]}

Shamsaei E. ^{[1
]}

Sagoe-Crentsil K. ^{[1
]}

Duan W. ^{[1
]}

机构：

[1] Department of Civil Engineering, Monash University, Clayton, 3800, VIC

来源：

Journal of Building Engineering | 2022年 / 54卷

基金：

澳大利亚研究理事会;

关键词：

Calcium silicate hydrate; Graphene oxide; Growth model; Nanostructure; Portland cement;

D O I：

10.1016/j.jobe.2022.104604

中图分类号：

学科分类号：

摘要：

Graphene oxide (GO) nanosheets can enhance the nanostructure of calcium silicate hydrate (C–S–H), the binder phase of Portland cement, and thereby increase the strength and durability of building materials. However, the mechanism underlying the observed enhancements remains to be elucidated, impeding the full realization of GO in the cementitious composites. Based on a comprehensive microscopy analysis of the effect of GO on C–S–H gel formed in tricalcium silicate cement, Portland cement, and synthetic systems, here we present a growth model that can explain the GO-induced improvements in the C–S–H nanostructure. It is proposed that GO nanosheets function as two-dimensional platforms to promote the growth of C–S–H gel via the Stranski–Krastanov (island-on-wetting-layer) growth mode. This growth mode can account for the formation of C–S–H with compact nanostructure leading to the cement matrix densification that has been widely reported in the literature. Through reconciliation with well-established descriptions of C–S–H gel, the proposed model can rationalize the superior mechanical and durability properties of cement building materials containing GO and other 2D nanomaterials. © 2022 Elsevier Ltd

引用

共 57 条

[1] Liu L., Et al., Mechanical properties of graphene oxides, Nanoscale, 4, 19, pp. 5910-5916, (2012)
[2] Li D., Et al., Processable aqueous dispersions of graphene nanosheets, Nat. Nanotechnol., 3, 2, (2008)
[3] Paredes J., Et al., Graphene oxide dispersions in organic solvents, Langmuir, 24, 19, pp. 10560-10564, (2008)
[4] Yang X., Et al., Well-dispersed chitosan/graphene oxide nanocomposites, ACS Appl. Mater. Interfaces, 2, 6, pp. 1707-1713, (2010)
[5] Shamsaei E., Et al., Graphene-based nanosheets for stronger and more durable concrete: a review, Construct. Build. Mater., 183, pp. 642-660, (2018)
[6] Huang J., Et al., Drylands face potential threat under 2 C global warming target, Nat. Clim. Change, 7, 6, (2017)
[7] Liu X., Fan Y., Business perspective to the national greenhouse gases emissions trading scheme: a survey of cement companies in China, Energy Pol., 112, pp. 141-151, (2018)
[8] Ghazanlou S.I., Et al., High-performance cement containing nanosized Fe3O4–decorated graphene oxide, Construct. Build. Mater., 260, (2020)
[9] Vallurupalli K., Et al., Effect of graphene oxide on rheology, hydration and strength development of cement paste, Construct. Build. Mater., 265, (2020)
[10] Long W.-J., Et al., Micro-mechanical properties and multi-scaled pore structure of graphene oxide cement paste: synergistic application of nanoindentation, X-ray computed tomography, and SEM-EDS analysis, Construct. Build. Mater., 179, pp. 661-674, (2018)

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