What is the main disadvantage of using too much cement in a concrete mix?

Using too much cement in a concrete mix leads to an increased cost, as cement is one of the most expensive components of concrete. Moreover, this excess cement can cause structural weaknesses, particularly cracking due to shrinkage. When cement is in excess, it tends to trap more heat during the hydration process. This heat can lead to thermal expansion and subsequently, when the concrete cools, it can contract too rapidly, causing cracks. Therefore, while a certain amount of cement is necessary to achieve the desired strength and durability of the concrete, too much can compromise its performance in the long run, impacting both the integrity and lifespan of the finished product.