What type of aggregate is more suited for a smoother finish in concrete?

Smaller aggregates are more suited for achieving a smoother finish in concrete due to their size. When smaller aggregates are used, they create fewer voids in the concrete mix, leading to a denser and more homogeneous material. This allows for a smoother surface texture because there are fewer protruding particles. Additionally, the smaller size facilitates better workability, enabling finishers to more effectively manipulate the surface to achieve the desired aesthetic appearance.

In contrast, larger aggregates can create a rougher surface finish as their size can lead to more pronounced textures and gaps on the surface. Recycled aggregates may have varying characteristics that could affect the consistency of the finish, and crushed concrete aggregates typically retain uneven shapes and surfaces that can also contribute to a rougher finish. Thus, smaller aggregates are the preferred choice for achieving a smooth and aesthetically pleasing concrete surface.