<p>Premature deterioration of reinforced concrete structures, often caused by chloride and carbonation-induced corrosion, significantly shortens service life. In many instances, signs of degradation such as cracks in the cover concrete appear within a few years of construction. This study evaluates the effect of mixture proportions on the durability-related properties of concrete. The results show that the non-carbonated concretes exceeded the porosity limits for exposure classes XC3 and XC4 by 24% to 38%. A reduction in porosity of about 16 to 23% was also observed in the fully carbonated zones. Furthermore, mixtures with higher compressive strength showed lower permeability and chloride penetration. An increase in aggregate content resulted in higher resistivity due to reduced porosity. It was found that 7 days of accelerated carbonation testing at 4% CO₂ for the mixture with higher w/cm (CT-0.92) was equivalent to 1.5–2 years of natural exposure at 0.03–0.04% CO₂, whereas the mixtures with lower w/cm ratios corresponded to about 2–7 months. Furthermore, mixtures CT-0.92 and LA-0.65 had lower alkali concentrations (0.28%–1.11%) than HO-0.61 and CT-0.71, which had higher K₂O (up to 4.06%) and Na₂O (up to 4.53%) levels, suggesting a higher potential risk for ASR. Also, the aggregates in mixtures CT-0.71 and HO-0.61 recorded higher reactive silica content (60–70%), suggesting a higher ASR risk. Additionally, mixture CT-0.92 was classified as non-reactive while the other mixtures were classified as potentially reactive with a pessimum effect (expansion ≥ 0.15%). The results also show that bond strength increases with an increase in strength.</p>