Enhancing mechanical strength and microstructural properties of alkali-activated systems through nano graphene oxide dispersion and polycarboxylate ether admixture

Article


Marbaniang, D. F., Adak, D., Kar, A., Barbhuiya, S., Chottemada, P. G. and Marthong, C. 2024. Enhancing mechanical strength and microstructural properties of alkali-activated systems through nano graphene oxide dispersion and polycarboxylate ether admixture. Construction and Building Materials. 453 (Art. 139004). https://doi.org/10.1016/j.conbuildmat.2024.139004
AuthorsMarbaniang, D. F., Adak, D., Kar, A., Barbhuiya, S., Chottemada, P. G. and Marthong, C.
Abstract

The dispersion of graphene oxide (GO) nanoparticles in alkali-activated concrete with / without superplasticizers can help in understanding the effect it has on its mechanical strength and microstructural properties. The dispersion of GO in alkali activator fluid of 10(M) and 12(M) with / without polycarboxylate ether (PCE) admixture has been explored in this study. The alkali activator solution of 10(M) NaOH solution with PCE shows better dispersion than 12(M) NaOH solution, as higher alkalinity leads to agglomeration of GO. The study investigated the effect of incorporating PCE in GO-based alkali-activated slag (AAS) mortar with 8(M), 10(M) and 12(M) of alkaline activator solution. The mechanical strength and microstructural characteristics of conventional AAS (without both GO and PCE), GO-based AAS (without PCE) and GO-based AAS with PCE of the respective molar concentration of activator fluid are analysed. The mechanical strength of the AAS mortars has been evaluated using compressive, flexural, and splitting tensile strength testing. The micro-structural and mineralogical characteristics of the binders are evaluated using Field Emission Scanning Electron Microscopy (FESEM with EDS), X-ray Diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR) analysis. The addition of only GO (0.06 % of binder w/w) and the addition of both GO and PCE in AAS have shown up to 30 % and 40 % mechanical strength improvement with respect to conventional AAS, respectively. The effectiveness of PCE and percentages of strength improvement are higher with a lower molarity of activator fluid, and vice versa. Adding GO and PCE to the AAS system improves its hydration rate and denser microstructure, enhancing its strength.

JournalConstruction and Building Materials
Journal citation453 (Art. 139004)
ISSN0950-0618
Year2024
PublisherElsevier
Accepted author manuscript
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Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.conbuildmat.2024.139004
Publication dates
Online07 Nov 2024
Publication process dates
Accepted29 Oct 2024
Deposited27 Nov 2024
Copyright holder© 2024 Elsevier
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