Effects of fibre content on mechanical properties and fracture behaviour of short carbon fibre reinforced geopolymer matrix composites |
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Authors: | Tiesong Lin Dechang Jia Meirong Wang Peigang He Defu Liang |
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Affiliation: | (1) Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China |
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Abstract: | Geopolymer matrix composites reinforced with different volume fractions of short carbon fibres (Cf/geopolymer composites) were prepared and the mechanical properties, fracture behaviour and microstructure of as-prepared
composites were studied and correlated with fibre content. The results show that short carbon fibres have a great strengthening
and toughening effect at low volume percentages of fibres (3·5 and 4·5 vol.%). With the increase of fibre content, the strengthening
and toughening effect of short carbon fibres reduce, possibly due to fibre damage, formation of high shear stresses at intersect
between fibres and strong interface cohesion of fibre/matrix under higher forming pressure. The property improvements are
primarily based on the network structure of short carbon fibre preform and the predominant strengthening and toughening mechanisms
are attributed to the apparent fibre bridging and pulling-out effect. |
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Keywords: | Short carbon fibre mechanical properties fracture behaviour geopolymer fibre content composite |
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