Influence of 2D rGO nanosheets on the properties of OPC paste |
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| Affiliation: | 1. Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India;2. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India;3. Center for Advanced Cement Based Materials, Northwestern University, Illinois 60208, USA;1. Dept. of Civil Eng., Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea;2. School of Polymer Science and Eng., Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea;3. Faculty of Eng., Shinshu University, Wakasato 4-17-1, Nagano 380-8553, Japan;1. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;2. Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran;3. Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia;4. Centre for Sustainable Infrastructure, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia;1. Dept. of Civil Eng., Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea;2. School of Polymer Science and Eng., Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea;3. Faculty of Eng., Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea |
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| Abstract: | In this experimental study, the effects of 2D reduced graphene oxide (rGO) sheets on the properties of Portland cement paste in comparison to popularly reviewed nanomaterials like aluminium oxide nanopowder (n-Al2O3) and colloidal silicon dioxide nanoparticles (n-SiO2) were investigated. The addition of 0.02% rGO sheets by weight of cement increased the 7 and 28 days flexural strength up to 70% and 23% respectively when compared to control paste. Moreover, its incorporation substantially decreased the sizes of pores/voids in the paste, even compared to the other nanomaterials, as characterized by Mercury Intrusion Porosimetry (MIP) and 3D X-ray Computed Tomography (CT) aided with image analysis technique. The assessment of Portlandite content by Thermo-gravimetric Analysis did not indicate major differences between the pastes, with the exception of the paste incorporating nano-silica. Microstructural analysis by Fourier Transform Infrared Spectroscopy, X-ray diffraction and Scanning Electron Microscopy did not reveal any major differences between the control paste and the pastes incorporating nanomaterials. The overall results suggest that the performance of rGO was better in comparison to other two nanomaterials, despite the significantly lower amounts that were used in the paste. |
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| Keywords: | Reduced graphene oxide Nanocomposite Pore structure Mechanical properties Tomography |
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