The critical role of nanotube shape in cement composites

The growing availability of nanotubes and the increased knowledge about their loading in polymers have prompted the incorporation of nanotubes in cementitious matrices. The effects of loading straight tungsten di-sulfide nanotubes (WS2NT) or waved carbon nanotubes (CNT) in cementitious matrices was...

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Bibliographic Details
Published in:Cement & concrete composites 2016-08, Vol.71, p.166-174
Main Authors: Nadiv, Roey, Shtein, Michael, Refaeli, Maor, Peled, Alva, Regev, Oren
Format: Article
Language:English
Subjects:
Carbon nanotubes
Cement
Cements
Composite
Compressive properties
Cracks
Fractography
Inclusions
Low concentrations
Mechanical properties
Nanostructure
Nanotubes
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Summary:The growing availability of nanotubes and the increased knowledge about their loading in polymers have prompted the incorporation of nanotubes in cementitious matrices. The effects of loading straight tungsten di-sulfide nanotubes (WS2NT) or waved carbon nanotubes (CNT) in cementitious matrices was explored. Their inclusion in these composites at exceptionally low concentrations (0.063 vol% and 0.15 vol% for WS2NT and CNT, respectively) enhanced the composite’s mechanical properties, including compressive and flexural strengths (25–38%). Thermal analysis and electron microscopy indicated that nanotube incorporation in cementitious matrices also accelerated hydration reaction kinetics. It was shown that straight WS2NTs bridged pores and cracks more effectively than the waved CNTs, which resist crack propagation via an anchoring mechanism. A comparison to representative cement nanocomposite systems shows that nanotubes (aspect ratio≫1), offer better reinforcement efficiencies than particulate nanomaterials, yielding high mechanical properties enhancement at low concentration.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2016.05.012