Performance of concrete superficially treated with nano-modified coatings under sulfuric acid exposures

Ibrahim, Amr M.; Bassuoni, M.T.; Carroll, J.; Ghazy, A.

doi:10.1016/j.jobe.2024.108957

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…When concrete structures are exposed to harsh environments such as coastal areas and saline soils, their surfaces can be damaged by freeze–thaw cycles [ 1 ], wetting–drying cycles [ 2 ], atmospheric carbonation [ 3 , 4 ], and ion corrosion [ 5 ], severely affecting the safety and durability of concrete structures [ 6 , 7 , 8 ]. The application of protective coatings to concrete surfaces is widely employed as a common method to prolong the lifespan of buildings and preserve the structural integrity of constructions within current engineering practices [ 9 , 10 , 11 , 12 ]. Geopolymer materials are a novel type of inorganic binder prepared through an alkali–silica/alumina reaction and are characterized by chemical resistance, strong adhesion, and environmental friendliness [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ], making them highly applicable in the formulation of protective coatings for concrete surfaces.…”

Section: Introductionmentioning

confidence: 99%

Improving Sag Resistance in Geopolymer Coatings Using Diatomite Filler: Effects on Rheological Properties and Early Hydration

Hu,

Jin,

Pang

et al. 2024

Materials

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The reduction in the rheological parameters and dissolution rate of precursors in geopolymer coatings during early hydration significantly contributes to sagging. This study aims to improve the sag resistance of these coatings by incorporating diatomite filler. Rheological testing was conducted to assess the impact of diatomite and its concentration on the yield stress, plastic viscosity, and thixotropy of the geopolymer coatings. The results indicated that diatomite’s large specific surface area and high reactivity have a significant influence on the rheological parameters and early dissolution rate of precursors. With a diatomite concentration of 1.1%, the coating exhibited a yield stress of 2.749 Pa and a plastic viscosity of 0.921 Pa·s, maintaining stability, homogeneity, and no sagging at a thickness of 600 μm. Furthermore, the highly active SiO2 in diatomite participates in the secondary hydration reaction of the geopolymer materials led to the formation of substantial C-(A)-S-H gel. This gel enhances internal interconnectivity within the coating, thereby improving its rheological and mechanical properties.

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