What are three main functions of coarse aggregate in concrete?

Coarse aggregate plays several crucial roles in concrete, with the primary functions being acting as filler, resisting loads, and minimizing volume changes.

When it comes to acting as filler, coarse aggregates occupy a significant volume within the concrete mix, which reduces the amount of cement paste needed. This is essential not only for cost efficiency but also for achieving the desired workability and density in the final concrete product.

Resisting loads is another vital function, as coarse aggregates provide the bulk and strength needed to withstand different types of loads applied to the concrete. The larger size and strength of these aggregates contribute to the overall structural integrity, making the concrete more durable and able to support various stresses.

Minimizing volume changes is important during the curing and drying processes. Coarse aggregates help to mitigate shrinkage and expansion that can occur due to moisture loss or temperature changes. By doing so, they contribute to the stability and longevity of the concrete structure.

These three functions highlight the importance of coarse aggregate in achieving a balance between performance, durability, and cost in concrete applications.