Graphene nanoplatelet-fly ash based geopolymer composites

Geopolymers show high quasi-brittle behavior because of their ceramic-like characteristics. Recent findings have indicated that graphene can be used as an additive to improve the mechanical properties of composites. In this study, we report the effect of the addition of graphene nanoplatelets (GNPs)...

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Bibliographic Details
Published in:Cement and concrete research 2015-10, Vol.76, p.222-231
Main Authors: Ranjbar, Navid, Mehrali, Mehdi, Mehrali, Mohammad, Alengaram, U. Johnson, Jumaat, Mohd Zamin
Format: Article
Language:English
Subjects:
Alkali activated cement (D)
Bending strength (C)
Compressive strength
Compressive strength (C)
Cracks
Fillers
Graphene
Mechanical properties
Microstructure (B)
Modulus of rupture in bending
Nanostructure
Wettability
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Summary:Geopolymers show high quasi-brittle behavior because of their ceramic-like characteristics. Recent findings have indicated that graphene can be used as an additive to improve the mechanical properties of composites. In this study, we report the effect of the addition of graphene nanoplatelets (GNPs) on the microstructure and mechanical properties of a fly ash based geopolymer. The GNPs are relatively homogeneously distributed in the matrix of all composites. However, overlapping and agglomerate formation of GNPs was detected by FESEM. The results showed that the compressive and flexural strength of the geopolymer improved by 1.44 and 2.16 times, respectively, when adding 1% GNPs. The introduction of a GNP filler, even at low filler weight fractions, increased the toughness, stress and strain at the first crack and rigidity. Moreover, the wettability decreased with an increase in GNP content.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2015.06.003