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Effect of highly dispersed carbon nanotubes on the flexural toughness of cement-based composites
Highlights The addition of MWCNTs improved flexural toughness of cement-based composites. Fracture energy increased to a maximum of 312.2N/m for a 0.08wt.% addition of MWCNTs. Flexural toughness index increased by up to 57.5% for a 0.08wt.% addition of MWCNTs. Composites with MWCNTs had lower porosity and a more uniform pore size distribution. MWCNTs act as bridge across crack and form a network that transfers load in tension.
Abstract Multi-walled carbon nanotubes (MWCNTs) modified by anionic gum arabic have been incorporated into Portland cement pastes to investigate the effect on flexural toughness. The flexural toughness of the cement composites were investigated, and the results showed that the addition of treated nanotubes significantly improved both the fracture energy and flexural toughness index of Portland cement pastes. The porosity and pore size distribution of the composites were measured using mercury intrusion porosimetry, and the results indicate that cement paste containing MWCNTs had lower porosity and a more uniform pore size distribution. The microstructure of samples was investigated using field emission scanning electron microscopy. This showed that MWCNTs act as bridges across cracks and voids and form a network that transfers the load in tension.
Effect of highly dispersed carbon nanotubes on the flexural toughness of cement-based composites
Highlights The addition of MWCNTs improved flexural toughness of cement-based composites. Fracture energy increased to a maximum of 312.2N/m for a 0.08wt.% addition of MWCNTs. Flexural toughness index increased by up to 57.5% for a 0.08wt.% addition of MWCNTs. Composites with MWCNTs had lower porosity and a more uniform pore size distribution. MWCNTs act as bridge across crack and form a network that transfers load in tension.
Abstract Multi-walled carbon nanotubes (MWCNTs) modified by anionic gum arabic have been incorporated into Portland cement pastes to investigate the effect on flexural toughness. The flexural toughness of the cement composites were investigated, and the results showed that the addition of treated nanotubes significantly improved both the fracture energy and flexural toughness index of Portland cement pastes. The porosity and pore size distribution of the composites were measured using mercury intrusion porosimetry, and the results indicate that cement paste containing MWCNTs had lower porosity and a more uniform pore size distribution. The microstructure of samples was investigated using field emission scanning electron microscopy. This showed that MWCNTs act as bridges across cracks and voids and form a network that transfers the load in tension.
Effect of highly dispersed carbon nanotubes on the flexural toughness of cement-based composites
Wang, Baomin (Autor:in) / Han, Yu (Autor:in) / Liu, Shuai (Autor:in)
Construction and Building Materials ; 46 ; 8-12
03.04.2013
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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