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• W3115299688 endingPage "121969" @default.
• W3115299688 startingPage "121969" @default.
• W3115299688 abstract "• All of the molecular structures of PCE can effectively remedy the agglomeration behavior of GO. • PCEs are adsorbed on the surface of GO through the bridging action of calcium ions (Ca 2+ ) in cement pore solution. • PCEs with higher charge density and longer side-chains are more suitable for GO dispersion. For graphene oxide (GO) to fully exert its reinforcing and toughening functions in cement-based composites, it must be well-dispersed in the cement matrix. In this study, the dispersion behaviour of polycarboxylate superplasticisers (PCEs) with different charge densities and side-chain lengths in the treatment of GO in cement pore solution was studied using ultraviolet spectroscopy, visual sedimentation, and optical microscopy. The results show that all of the molecular structures of PCE can effectively remedy the agglomeration behaviour of GO in cement pore solution. However, for a fixed side-chain length, a higher charge-density PCE structure is better for GO dispersion, and for a fixed charge-density, a longer side-chain is better for GO dispersion. PCEs are adsorbed on the surface of GO through the bridging action of calcium ions (Ca 2+ ) in a cement pore solution. First, the agglomeration of Ca 2+ complexed by GO is effectively hindered by steric hindrance due to the side-chains. Second, the carboxyl groups of the PCE main chain complex with Ca 2+ to reduce the free Ca 2+ concentration near the GO sheets. For a fixed side-chain length, a higher charge density promotes GO dispersion by increasing electrostatic repulsion and decreasing the free Ca 2+ concentration. For a fixed charge density, a longer side-chain substantially increases steric hindrance and promotes GO dispersion. In general, PCEs with higher charge density and longer side-chains are more suitable for manufacturing GO cement composites." @default.
• W3115299688 created "2021-01-05" @default.
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• W3115299688 date "2021-02-01" @default.
• W3115299688 modified "2023-09-24" @default.
• W3115299688 title "Influence of the molecular structure of a polycarboxylate superplasticiser on the dispersion of graphene oxide in cement pore solutions and cement-based composites" @default.
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• W3115299688 doi "https://doi.org/10.1016/j.conbuildmat.2020.121969" @default.
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