The Possibilities of Exposed Aggregate Concrete
Before stamped concrete, decorative overlays, and stencilled finishes became popular, exposed aggregate was already widely used as an attractive decorative concrete option.
It combines many of the best qualities of concrete. It is durable, practical, relatively low maintenance, and available in a wide range of colours and textures. The visible stone creates a natural appearance that can complement brick, landscaping, plain concrete, and other exterior finishes.
Whether you are planning a new driveway, backyard patio, front walkway, or pool deck, exposed aggregate offers plenty of design flexibility.
Contact Pro Pavement Services Ltd. to learn how exposed aggregate concrete can enhance your property.
How an Exposed Aggregate Finish Is Created
An exposed aggregate finish is created by placing concrete and then removing the thin upper layer of cement paste to reveal the natural stone beneath the surface.
The final appearance depends on the colour, size, and texture of the aggregate, as well as how deeply the stone is exposed.
Two of the most common methods used to create the finish are brushing and washing, and the application of a surface retarder.
Advantages of Exposed Aggregate Concrete
Exposed aggregate is a practical choice for homeowners looking for an attractive and affordable decorative concrete surface.
Its advantages include:
- A wide variety of colours, textures, and stone combinations
- A textured, slip-resistant surface
- Good performance in high-traffic areas
- Durability in changing weather conditions
- The ability to complement plain, coloured, or decorative concrete
- Relatively simple maintenance with occasional cleaning and sealing
Because of its versatility, exposed aggregate can be used for both large and small residential projects.
Brushing and Washing
The brushing and washing method does not require specialized chemicals, but proper timing is essential.
After the concrete has been placed, water and brushes are used to remove the surface mortar and reveal the aggregate below. The concrete must be firm enough to hold the stones in place but soft enough for the upper layer to be removed.
Only the desired amount of surface mortar should be washed away. Removing too much can loosen the aggregate or create an uneven finish.
Surface Retarder
For larger projects such as driveways, patios, and pool decks, contractors may use a surface retarder.
A surface retarder slows the setting of the top layer of concrete while allowing the concrete beneath it to continue hardening. This gives the installation team more time to wash and scrub the surface evenly.
The method can help create a consistent exposed aggregate finish across a larger area.
Sealing and Protecting Exposed Aggregate
Applying a transparent concrete sealer can help keep exposed aggregate looking attractive for years.
A suitable sealer can help protect the surface from stains, moisture penetration, freeze-thaw cycles, deicing salts, abrasion, surface wear, and spalling.
Sealing may also deepen the colour of the stone and make the aggregate more noticeable.
The surface should be cleaned as needed and resealed periodically depending on traffic, weather exposure, and the type of sealer used.
A Durable and Decorative Choice for Your Property
Exposed aggregate can be used to create a durable and decorative finish for many areas around your property. It offers natural colour variation, added texture, and a distinctive appearance while maintaining the strength and practicality of concrete.
Pro Pavement Services Ltd. can help you plan an exposed aggregate project that suits your home, outdoor space, and intended use.