Microstructure and macroscopic properties of hybrid carbon nanofiber/silica fume cement composites |
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| Authors: | Florence Sanchez Chantal Ince |
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| Affiliation: | 1. Polymeric & Soft Materials Section, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110 012, India;2. Materials Physics and Engineering Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110 012, India;3. Physics of Energy Harvesting Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110 012, India;4. Department of Physics & Astrophysics, University of Delhi, Delhi 110 007, India;5. Physics and Engineering of Carbon, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110 012, India;1. Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia;2. Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia;3. Department of Materials Engineering, Monash University, Clayton, Victoria 3800, Australia;4. Department of Civil and Environmental Engineering, The National University of Singapore, 119260, Singapore |
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| Abstract: | The effect of up to 2 wt% of “as received” carbon nanofiber (CNF) loading on the microstructural, physical, and mechanical (compressive and splitting tensile strengths) properties of hybrid CNF/silica fume cement composites has been studied. Silica fume (SF) facilitated CNF dispersion due to its small particle size and improved the interfacial interaction between the CNFs and the cement phases. The CNFs were found embedded as individual fibers throughout the paste and self-aggregated as clumps in pockets. Mechanically, the CNFs embedded in the paste and at the pocket edges acted to offset the effect of defects created by the pockets. The addition of CNFs promoted pore refinement of the composites and increased the pore volume in the 6–200 nm pore diameter range, ascribed in part to interstitial pores between the entangled CNFs. |
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