Paper Contents
Abstract
This study explores the long-term mechanical performance and durability of concrete modified with nano-alumina (Al2O3) particles when subjected to aggressive acidic environments. Concrete cube specimens measuring 100 mm were cast with nano-alumina dosages of 1%, 2%, and 3% by weight of cement and exposed to a 5% sulfuric acid solution for durations of 28, 56, and 90 days. Mechanical and microstructural characterization included compressive strength testing, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). Results indicated that the incorporation of nano-alumina improved compressive strength, pore refinement, and durability. Enhanced resistance to acid attack was evident in mixes containing 2% nano-alumina, which showed reduced calcium leaching and denser CSH gel formation. SEM and EDS confirmed lower microcracking and improved microstructure densification. The XRD results revealed decreased portlandite peaks and increased formation of secondary calcium-silicate-hydrate (CSH), supporting durability improvements. This research confirms the beneficial role of nano-alumina in extending concrete service life under chemically aggressive environments.
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Copyright © 2025 SHIVAM. This is an open access article distributed under the Creative Commons Attribution License.
