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• W4366495170 abstract "Proper dispersion of silica fume (SF) plays a crucial role for the optimisation of low water-to-binder concrete mixtures like High and Ultra High-performance concretes (HPC and UHPC). At high concentrations (≥ 10 wt%), dispersing SF can prove to be extremely challenging with conventional plasticizer. In this work, we evaluate the production of UHPC with [email protected] which are SF particles with a small layer of polyethylene glycol (PEG) covalently grafted at the surface of SF. UHPC was used in this case as a good example of very low water-to-binder concrete with high volume silica fume. Remarkably, UHPCs made with all [email protected] samples showed lower viscosity, longer workability and lower mixing power requirements compared to UHPC made with SF. The use of [email protected] also allows to drastically reduce the amount of polycarboxylate superplasticizer needed to ensure a workable dispersion. Furthermore, the UHPC prepared with [email protected] (2.5 wt% of PEG) exhibit a 14% increase in compressive strength compared to the UHPC prepared with SF. Finally, scanning electron microscopy of the UHPC containing [email protected] particles clearly indicate that the [email protected] is much better dispersed in comparison to UHPC containing SF particles. Due to their lower viscosity, longer workability, lower mixing energy requirements and higher compressive strengths, we envision that [email protected] could significantly impact the manufacturing of HPC or UHPC." @default.
• W4366495170 created "2023-04-22" @default.
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• W4366495170 date "2023-06-01" @default.
• W4366495170 modified "2023-09-27" @default.
• W4366495170 title "Self-dispersing silica fume nanoparticles: A valuable admixture for ultra high-performance concrete" @default.
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• W4366495170 doi "https://doi.org/10.1016/j.conbuildmat.2023.131357" @default.
• W4366495170 hasPublicationYear "2023" @default.
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