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It is possible for concrete to be too strong. If a concrete mix is too dense, it can cause cracking and other problems. In addition, if the mixture is too wet, the resulting concrete may be too weak. It's important to get the proportions of sand, gravel, cement and water just right in order to produce a strong but durable concrete.

Concrete slabs should be designed with expansion joints to allow the slab to move freely. If a slab is too large without expansion joints, it will crack.

Concrete and cement are both construction materials that are used extensively around the world. They both have their own unique properties and uses, which is why they are often confused with one another. 

Concrete is a mixture of cement, water, sand, and gravel. It is used in construction projects such as foundations, flooring, walls, and roads. The main advantage of concrete is that it is very strong and durable. 

Cement, on the other hand, is a powder made from limestone and clay. It is mixed with water to make mortar or concrete. Cement is an essential ingredient in construction because it gives concrete its strength and durability.