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Effect of Carbon Nanomaterials on the Microstructural and Mechanical Properties of Geopolymer Binders

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International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures (SynerCrete 2023)

Part of the book series: RILEM Bookseries ((RILEM,volume 44))

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Abstract

The mechanical and microstructural properties of carbon nanomaterial reinforced geopolymers are investigated regarding carbon nanomaterial type, carbon nanomaterial content, and curing conditions. For this purpose, three types of carbon nanomaterials (CN) were investigated: pristine carbon nanotubes (P-CNT), functionalized carbon nanotubes (F-CNT) and, pristine carbon nanohorns (CNH). The CN were ultrasonically stirred with potassium silicate and a polycarboxylate-based superplasticizer. The homogeneous mixture was stirred with metakaolin, and cured at 20 ℃ and 60 ℃, respectively, for seven days. The different CN proportions were 0.2%, 0.5%, and 1.0% in weight to the amount of metakaolin. Subsequently, flexural strength and toughness were evaluated. The pore structure and pore size distribution were measured by mercury porosimetry. Oven curing at 60 ℃ increased the flexural strength and toughness of all samples. The addition of all types of CN increased the mechanical properties compared to plain geopolymer. Samples with 0.2% F-CNT, cured at 60 ℃, had the highest flexural strength increase of ~ 140%. The increase in curing temperature had the highest effect on F-CNT doped samples. At 0.2%, cured at 60 ℃, pristine CNT and CNH had approximately the same strength increase (~100%). However, at 0.5%, contrary to P-CNT, the pristine CNH samples had a further strength increase (~112%).

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Acknowledgments

The authors gratefully appreciate the financial support from the DFG (Deutsche Forschungsgemeinschaft) German national science foundation for the financial support of the NanoGP project ‘Multiscale modeling of advanced nano-reinforced geopolymer/CNTs materials’ under project number 446266595. The authors would also like to acknowledge Dr. Sandeep Yadav for providing the carbon nanohorns.

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Authors and Affiliations

  1. Institut für Werkstoffe im Bauwesen, Technische Universität Darmstadt, Darmstadt, Germany

    Liliya Dubyey, Leon Winn, Neven Ukrainczyk & Eduardus Koenders

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  1. Liliya Dubyey
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  2. Leon Winn
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  3. Neven Ukrainczyk
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  4. Eduardus Koenders
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Correspondence to Liliya Dubyey .

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Editors and Affiliations

  1. Department of Structural Engineering, Silesian University of Technology, Gliwice, Poland

    Agnieszka Jędrzejewska

  2. Technical Specialist Services, Materials, ARUP, London, UK

    Fragkoulis Kanavaris

  3. ISISE, University of Minho, Guimaraes, Portugal

    Miguel Azenha

  4. Laboratoire de Mécanique Paris-Saclay, ENS Paris-Saclay, Gif-sur-Yvette, France

    Farid Benboudjema

  5. Institute of Structural Concrete, Graz University of Technology, Graz, Austria

    Dirk Schlicke

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Dubyey, L., Winn, L., Ukrainczyk, N., Koenders, E. (2023). Effect of Carbon Nanomaterials on the Microstructural and Mechanical Properties of Geopolymer Binders. In: Jędrzejewska, A., Kanavaris, F., Azenha, M., Benboudjema, F., Schlicke, D. (eds) International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023. RILEM Bookseries, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-031-33187-9_50

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  • DOI: https://doi.org/10.1007/978-3-031-33187-9_50

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-031-33186-2

  • Online ISBN: 978-3-031-33187-9

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