Which type of aggregate is most commonly used in concrete?

Gravel is the most commonly used aggregate in concrete because it provides greater strength and stability to the finished product. It consists of larger particles than sand, which allows for better load-bearing capacity and structural integrity, making it ideal for a variety of concrete applications, from foundations to driveways. Gravel also aids in drainage, reducing the risk of water accumulation within the concrete.

While sand is also an important component – often mixed with gravel to create concrete – it typically serves to fill the voids between larger particles, improving workability and reducing shrinkage. Clay, on the other hand, is not suitable as an aggregate for concrete due to its plasticity and tendency to expand and contract with moisture changes, which can compromise the durability of the concrete. Quartz can be found in both sand and gravel, but it is not used as an aggregate form on its own; instead, its role is more about providing specific properties when mixed into the aggregate blend.