Exposed Aggregate Concrete

Exposed aggregate concrete refers to a type of decorative finish in which the cement paste on the surface is washed away to reveal the aggregates in the concrete.

exposed aggregate concrete closeup exposed aggregate concrete
When the concrete gets hard enough, but not too hard, cement on the surface is washed and brushed away to expose the aggregates in the concrete mix. Close-up of exposed aggregate when it's done. Notice the many different colors of stones. The concrete matrix around the stones has a brown tint thanks to tinted brown sealer.

This is one of the oldest types of decorative concrete that is still widely used today on siewalks, driveways, patios, and porches. A few things have improved with it over the years such as integral coloring and better sealers.

exposed aggregate concrete

There are three different methods for producing this finish:

  • Seeding - After the concrete is placed, desired aggregates are seeded or broadcasted onto the surface and worked in with bullfloats or handfloats.
  • Monolithic - Desired aggregates are mixed into the batch of concrete. This is the most common technique with pea gravel as the usual choice.
  • Overlay - Aggregates are mixed into a topping material and applied as an overlay. This technique is used on existing concrete that is structurally sound.

exposed aggregate concrete

The key to a quality finish is getting the cement on the surface to stay soft while everything underneath hardens. This is achieved by using a surface retarder. After the concrete is poured and smoothed out, a retarder is sprayed on the surface. A few to several hours later the cement is washed away with a hose or pressure washer.

Exposed aggregate is a fairly easy method of finishing concrete that anyone with concrete finishing experience can do. Aside from surface retarder, it reqiures no more than the basic finishing tools. There are a few other advantages:

  • Relatively inexpensive when compared to other decorative methods such as stamping and stenciling.

  • Provides rugged and slip resistant surface.

  • Many types and colors of aggregates are available.

  • Looks nice next to plain concrete making it ideal for borders, bands, and accent designs.

  • Hides dirt and minor stains.

  • Easy to maintain.

  • More Exposed Aggregate Concrete Info

    Exposed Aggregate Driveway... Use this method to enhance a drivewy in its entirety or for borders, bands, and accent designs.

    Exposed Aggregate Concrete Sealer... Best sealers to use for this type of finsih to get the rich, wet look.

    Get Free Estimates for Exposed Aggregate Concrete from Screened Local Contractors

    New! Comments

    Share your thoughts about what you just read! Leave a comment in the box!

    search engine by freefind advanced

    Concrete Stain
    and Supplies

    concrete stain

    True Acrylic
    Concrete Stains


    NEWEST Additions
    Concrete Patio Pictures...

    Concrete Floor Radiant Heating...

    How to Paint Concrete...

    Concrete Countertop Video