Which of the following practices is essential in producing a durability-focused concrete mix?

Using quality aggregates and appropriate water-to-cement ratios is essential for producing a durability-focused concrete mix because these factors directly influence the strength and longevity of the concrete. High-quality aggregates contribute to the overall structural integrity by providing adequate strength, resistance to weathering, and minimizing shrinkage. Additionally, the water-to-cement ratio is crucial since it affects the hydration process. A balanced ratio ensures that there is enough water for proper hydration without compromising the density and strength of the concrete. Proper hydration leads to a denser and more durable concrete matrix, which is less susceptible to cracking, scaling, and other forms of deterioration. Therefore, focusing on these elements ensures that the concrete can withstand environmental stresses and maintain its performance over time.