Progress in fabrication and manufacturing of sodium aluminosilicate materials (geopolymers) as protective coating materials: A review

Tomar, Akshay Singh; Gupta, Rainy; Bijanu, Abhijit; Arya, Rahul; Mishra, D. C.; Singh, Archana; Salammal, Shabi Thankaraj

doi:10.1007/s10965-022-03078-3

Cited by 5 publications

(1 citation statement)

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“…It can also be used as an admixture in concrete [9]. Alkali-activated slag may become a coating material due to its compatibility with cement and concrete [10]. So far, the alkali-activated slag coating has been reported in the relevant literature [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Graphene's effect and mechanism on the properties of alkali-activated slag coating

Wang

Liu

Hua

et al. 2023

Mater. Res. Express

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Alkali-activated coating materials have the problem of easy cracking. Alkali-activated materials are brittle and prone to shrinkage. When used as a coating, cracks appear on the surface. It will peel off from the substrate material and the adhesion will be reduced. In order to improve the crack resistance and adhesion of alkali-activated materials as repair and protective coatings, the effect of graphene on the properties of coatings was investigated. In this paper, a coating was prepared with blast furnace slag as the main raw material and sodium silicate water glass as the activator. By adding graphene dispersion to improve the microstructure and macroscopic properties of the coating. In the experiment, 0.2 %, 0.4 %, 0.6 %and 0.8 % graphene dispersions were added to the alkali-activated slag coating, and compared with the blank sample. The drying time, apparent properties and bonding strength of the coatings with different thicknesses were measured. It was found that the graphene dispersion could improve the crack resistance of the coating. The bonding strength of the coating at 7d and 28d was also improved. When 0.8 % was added, the maximum bonding strength was 1.577 MPa. Combined with XRD, FTIR and SEM, it was found that graphene dispersion may promote the formation of zeolite phase in alkali-activated slag coating and reduce the porosity at the interface between coating and substrate. This promotes chemical bonding at the interface. The experimental results show that the graphene dispersion is beneficial to improve the cracking of the coating and enhance the bond strength with cement mortar.

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