Enhancement of the modulus of compression of calcium silicate hydrates via covalent synthesis of CNT and silica fume

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The effects of covalently synthesized CNT and silica fume on the modulus of compression of calcium silicate hydrates were investigated in the present study. For the conjugation of CNT and silica fume, the surfaces of silica fume and CNT were functionalized with a primary amine group and a carbonyl chloride group, respectively. The aminated silica fume and carbonyl chloride functionalized CNT were covalently bonded by the formation of amide bridges. The characteristics of the covalently synthesized CNT and silica fume were investigated via zeta potential, Fourier-transform infrared spectroscopy, scanning electron microscopy, Raman spectroscopy and sedimentation tests. The compressive strength and modulus of compression of calcium silicate hydrates of cementitious composites incorporating the synthesized CNT and silica fume were then investigated. The test results showed that the addition of the synthesized CNT and silica fume improved the stiffness of calcium silicate hydrates, thereby significantly increasing the compressive strength of the composites.
Publisher
ELSEVIER SCI LTD
Issue Date
2019-02
Language
English
Article Type
Article
Citation

CONSTRUCTION AND BUILDING MATERIALS, v.198, pp.218 - 225

ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2018.11.161
URI
http://hdl.handle.net/10203/248982
Appears in Collection
CE-Journal Papers(저널논문)
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