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• W4311768418 abstract "Ambient humidity and air pressure have significant effects on the durability of cement-based materials subjected to sulfate attack. This paper investigated the durability performance of cement paste and cement mortar containing nano-SiO2 (NS) and nano-Al2O3 (NA) attacked by Na2SO4 solution under low air pressure (60 kPa, LP) and normal air pressure (101 kPa, NP) environments. The results showed that supersaturated Na2SO4 solution could crystallize in the pores of mortar and deposit on the surface of mortar, accompaning by the transformation from Na2SO4∙10H2O with fibrous to Na2SO4 with powder. The presence of low air pressure environment exacerbated the capillary transport rate and the water evaporation rate, resulting in a severer salt efflorescence. However, the incorporation of NS/NA could reduce the adsorption height of the salt solution on the surface of the mortar and thus alleviate the Na2SO4-induced damage. Moreover, the flexural/compressive strength of nano-modified mortar subjected to Na2SO4 attack under NP and LP environments were enhanced due to the nucleation effect and chemical activity of NS and NA. Furthermore, the addition of nanomaterials decreased the porosity and the amount of harmful pores above 50 nm in the samples and increased the consumption the erodible Ca(OH)2, reducing the generation of Na2SO4-induced corrosion products. Among them, the system containing NA at 0.5 wt% performed better, which is of great significance for the protection of concrete components exposed to sulfate attack in the practical engineering." @default.
• W4311768418 created "2022-12-28" @default.
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• W4311768418 date "2023-04-01" @default.
• W4311768418 modified "2023-10-06" @default.
• W4311768418 title "Durability effect of nano-SiO2/Al2O3 on cement mortar subjected to sulfate attack under different environments" @default.
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• W4311768418 doi "https://doi.org/10.1016/j.jobe.2022.105642" @default.
• W4311768418 hasPublicationYear "2023" @default.
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