What type of aggregate would be classified as fine aggregate in Portland cement concrete?

In Portland cement concrete, fine aggregate primarily consists of particles that are smaller in size, typically less than 4.75 mm (0.2 inches). Sand is the most common example of fine aggregate, as it fits this size requirement and contributes vital properties to the concrete mix such as workability, strength, and stability.

Fine aggregates like sand help fill the voids between larger aggregates, providing a more compacted mix which can enhance the overall strength and durability of the concrete. Additionally, the shape, texture, and grading of the sand can impact the performance characteristics of the concrete, making it a critical component in the mix design.

Understanding this classification is essential in concrete technology, where the physical and chemical properties of the aggregates can significantly influence the characteristics of the completed concrete. Other materials, such as crushed stone, coarse gravel, and recycled concrete, fall into different categories and do not meet the definition of fine aggregates due to their larger particle sizes or varying compositions.