Should I Use Exposed Aggregate Concrete In My Driveway? (2024)

FAQs

What are the disadvantages of exposed aggregate concrete driveways? ›

Unsealed exposed aggregate concrete is susceptible to water damage, stains, chips, cracks, and abrasion. Sealers are available in various finishes and levels of gloss. Outdoor exposed aggregate concrete should be sealed with a non-yellowing, UV-resistant sealer to preserve the look of the finish.

Exposed aggregate can be a worthwhile investment for anyone looking to add more curb appeal, greater weather resistance, and a more decorative finish to their driveway, walkway, or pool surround. It does require some minor maintenance, but not more than any other kind of high-quality concrete.

This may be a little more expensive than some other driveway options, but it is well worth the investment. An exposed aggregate driveway will last for many years with very little maintenance, making it a cost-effective and stylish choice for your home.

When it comes down to which type of concrete is more durable, aggregate concrete is usually favoured more for outdoor use as it is highly durable against changing weather conditions. Its original appearance remaining intact against dirt and debris. Stamped concrete is usually favoured more for interior flooring.

But how long will exposed aggregate last? With the right care, you're looking at over 10 to 20 years of life. One of the most attractive benefits of using exposed aggregate is its longevity. At Concept Concrete, we offer up to a 78-month warranty on your exposed concrete driveways, patios, and more.

By applying a sealant to exposed aggregate concrete, it helps to protect the substrate from stains as well as repelling moisture which will help to keep the concrete in good condition.

It can weaken the surface and the binder that is holding the exposed aggregate together. The resulting effect on the concrete with multiple holes in it is what's called “pop out.” The aggregate itself will pop out of the top surface. So, if you don't seal it, you're risking damage from: Freeze-thaw.

Cool Greys

Cool grey exposed aggregate colours can perfectly complement these modern elements. From light grey to charcoal, these shades provide a clean and sophisticated look that can enhance the overall appeal of your outdoor spaces.

The most suitable size of aggregate (gravel) depends on how the driveway is going to be used. If the driveway regularly has vehicles driving on and off it, a size of between 14mm and 20mm is often recommended. Anything smaller can get caught in the tyre treads of the car.

Your new aggregate concrete floor will need time to cure and dry before any traffic has access. We highly recommend waiting a full day before walking on it and at least 7 days before driving on it. This is to ensure it is fully cured and has had the time to reach its optimal strength.

How thick should exposed aggregate concrete be? ›

Exposed Aggregate concrete is placed (min thickness usually 100mm, for driveways).

Cleaning exposed aggregate

Ideally, you want to sweep your patio or driveway at least once a day to keep it free from dust, dirt, or debris. (You can also use a leaf blower to speed up the process). Rinsing the surface with a garden hose is also a good idea to wash off stubborn dirt or stain spots.

Generally, the best concrete mix for your driveway should have a compressive strength of at least 3500 psi to 4000 psi, a cement-water ratio of around 0.50 to improve the concrete's longevity, and aggregates no larger than 1-inch in size with a slump of 4 to 5 inches.

Durability: One of the main advantages of exposed aggregate concrete is its durability. Concrete is a strong and long-lasting material, and when it is exposed to aggregate, it becomes even more resistant to damage from weather, wear, and tear.

If you want a low to high gloss finish without changing the color of the concrete, a water based acrylic concrete sealer is the best option. If you want a low to high gloss finish and you want a wet look, a solvent based acrylic concrete sealer is the best option.

Long, flat aggregate should be avoided due to increased interaction with other particles and the tendency toward segregation during handling. Shape and texture of coarse aggregates affects the strength of the concrete mix. Increased surface area provides more opportunity for bonding and increases strength.

Excessive dust and varying material colors are some of the crushed concrete driveway problems that may arise. A crushed concrete driveway will require regular maintenance. This may include periodic decompaction, filling in any cracks or potholes, and keeping the surface clean and free of debris.