What is the role of aggregates in concrete?

Aggregates play a crucial role in the overall composition and properties of concrete. They are the primary component of concrete, typically making up about 60-75% of its volume. When incorporated into the concrete mix, aggregates provide structural strength and stability, which are essential for the durability and load-bearing capacity of the finished product.

The size, shape, and composition of aggregates can significantly influence the workability, strength, and structural integrity of concrete. Fine aggregates, like sand, help fill the voids between larger coarse aggregates, like gravel or crushed stone, creating a dense and cohesive mixture. This densification is fundamental for ensuring that the concrete can properly support loads without cracking or failing under stress.

While aggregates can have some impact on aesthetic qualities, thermal insulation, and curing rates to a minor extent, their primary purpose in concrete is to provide the structural framework that allows the concrete to withstand various forces, making their role central to the engineering properties of concrete.