Aggregate is a structural filler that fills the majority of the volume of concrete. Essentially, it’s the material bound together and coated by the cement paste. Whether you’re planning to build a concrete countertop for your fireplace or outdoor patio, it’s important to understand the role of aggregate so you can create the appropriate concrete formula mix. Below, the team at Hilltop Basic Resources, the leading construction material supplier in Cincinnati, OH, discusses what you need to know.

A Guide to Aggregates & Countertops

Material

The most popular aggregate materials for countertops are natural stones and crushed rock, such as quartz, limestone, and marble. Avoid light aggregate materials, as these can result in a weak countertop. Keep in mind that if you plan to grind the concrete countertop with diamond tooling, the aggregate will show.

Size

Other important factors when selecting aggregate are the size and gradation of the material. Aggregates range in size, from large rocks to fine grains of sand. A general rule of thumb to follow is that the largest aggregate material should be smaller in diameter than one-third of the depth of the slab. Coarse, or larger-sized aggregate, can also be blended with finer aggregates to fill the spaces left between the large pieces.

Shape

The shape of aggregate impacts the strength and workability of the concrete mix. Angular materials have more surface area and can be packed tighter than rounded materials, which may be less effective for workability. However, angular aggregate will also require more cement paste to be coated with the round materials.

When it comes time to purchase aggregate for your construction project, you can count on the team at Hilltop Basic Resources in Hamilton County for their high-quality materials. They are also known among their clients for their outstanding customer service and efficient delivery. Call (513) 684-8200 to schedule an appointment or visit their website for more information.