To achieve stronger concrete, what should be added?

Adding a little more cement can enhance the strength of concrete. Cement acts as the binding agent in the mixture, where it hydrates and hardens to hold the aggregates—like sand and gravel—together. Increasing the amount of cement improves the chemical reaction that occurs during curing, which results in a denser and more cohesive material. This leads to increased compressive strength and overall durability of the concrete once set.

While other components like water and aggregate ratios are essential for achieving optimal performance, adding more cement specifically boosts the binding characteristics of the mix, ultimately leading to stronger concrete. Therefore, it's crucial to balance the mix design correctly while ensuring the right proportions to avoid issues like shrinkage or cracking that can occur with excessive cement.