Exposed aggregate concrete is a popular choice for many Australian homes. This unique material stands out because of its textured appearance.
By exposing the aggregates — stones, pebbles, and sand — within the concrete, it achieves a striking look.
This type of concrete is versatile. You’ll find it everywhere, from driveways to patios.
Homeowners love it not only for its aesthetics but also for its durability. It can withstand harsh weather, making it an ideal choice for outdoor spaces.
Yet, the beauty and durability of exposed aggregate surfaces can be compromised without proper care.
In this article, we discuss how you can keep your exposed aggregate concrete in pristine condition. We also offer simple, effective strategies to ensure your surfaces remain as captivating as the day they were poured.
7 Steps to Clean Exposed Aggregate Concrete
Here are seven easy steps to clean exposed aggregate concrete:
- Step 1: Sweep dust and debris from the concrete surface to prevent potential streaks or stains.
- Step 2: Rinse the surface using a garden hose to help loosen any stubborn grime.
- Step 3: Apply concrete cleaner or driveway cleaning solution, following the instructions on the label for dilution and application.
- Step 4: Allow the cleaner to sit for about 20 minutes so it can break down tough stains.
- Step 5: Use a stiff bristle brush to scrub the surface and dislodge any embedded dirt.
- Step 6: Use a pressure washer to remove any remaining cleaner and deep-seated dirt.
- Step 7: Perform regular cleaning, ideally once or twice a year, to maintain the concrete’s condition. Increase the frequency if the area is heavily used or exposed to harsh weather.
For stains, you can use absorbent materials or specific stain cleaners to remove them. Sealing and regular cleaning can help you maintain exposed aggregate concrete driveways, patios, and other surfaces.
How to Safely Clean Exposed Aggregate Concrete
So, how does one clean exposed aggregate concrete?
Let’s go step-by-step on how you can effectively complete the task:
Step 1: Sweep Away Dust and Debris
Give your concrete a quick but thorough sweep, ensuring you remove all the dust and debris. This initial step prevents dirt from creating streaks or stains when you apply water.
Step 2: Rinse With Water
Aim your garden hose at the concrete. This initial rinse is a ‘surface clean’, removing the concrete’s upper grime layers. Make sure to rinse the entire area, not just the dirty parts.
Step 3: Apply a Concrete Cleaner
Next, you’ll need a concrete cleaner or a specific driveway cleaning solution. You can find these at your local home improvement store.
Follow the instructions on the cleaner’s label, which typically involves diluting the cleaner with water before applying.
Step 4: Let the Cleaner Do Its Job
No need to rush this part. Let the cleaner soak into the concrete for about 20 minutes. This gives it time to break down stubborn stains.
Step 5: Scrub the Surface
Grab a stiff bristle brush and gently scrub your concrete. It helps to unearth trapped dirt lodged in between the aggregate pieces.
Step 6: Pressure Wash the Concrete
Time for the big guns! Use your pressure washer here (if you don’t have one, they can be rented!). It will remove any cleaner residue and dislodge deep dirt.
Step 7: Do Regular Cleaning
You’ll want to clean your exposed concrete regularly to keep it in pristine condition. How often you need to clean your concrete depends on the weather and how much foot traffic it sees.
A good rule of thumb is to carry out the cleaning process as outlined earlier at least once or twice a year. However, if the area is frequently used or exposed to the elements, you might need to do this more regularly.
Tackling Stains Head-On
Stains from oil, grease, and rust pose the most challenge in maintaining the pristine look of exposed aggregate surfaces.
The best piece of advice we can give you it to clean stains promptly. Letting these stains sit for too long can make them more difficult to remove.
For grease and oil stains, applying a layer of absorbent material overnight can help lift some of the oil from the surface.
Following that, using a strong chemical degreaser in combination with a stiff brush or broom can emulsify and remove the remaining stain.
When dealing with rust stains — often the result of metal objects left on the surface — employing a water-based cleaner designed for rust removal can offer an effective solution.
Always remember to protect yourself with goggles and gloves. Also, ensure you’re working in a well-ventilated area. Read the instructions carefully before using the products.
Some stubborn stains might require application over several days or employing professional concrete services for removal.
What Causes Damage to My Concrete Driveway?
Exposed aggregate concrete might be durable, but it’s not indestructible. Certain factors can damage it.
Here’s the lowdown on what you should avoid.
Incorrect Sealing
A sealant helps to safeguard your concrete from enveloping moisture and resisting chemical and oil spills. However, incorrect application, such as applying too much, too little, or unevenly, can lead to problems like cracks or discoloured patches.
Acidic Substances
Acids are a big no-no. They can react with the cement paste that binds the concrete and lead to deterioration. So, avoid any cleaners that are acid-based and keep materials like vinegar or citrus fruits away.
Heavy Loads
Exposed aggregate concrete can crack under intense weight. They can also cause unpleasant tyre marks on your driveway.
So, keep those super-heavy vehicles or machinery off your driveway. Also, dropping heavy objects onto the surface can cause cracks or chips.
Pressure Washing Malpractice
Pressure washing can do wonders to clean your concrete, but incorrect use can be damaging. High pressure can forcibly remove the aggregate exposed on the surface, leading to an uneven appearance and a weaker structure.
Harsh Weather
Weather, particularly freeze-thaw cycles, can be damaging. Water seeps into the concrete, freezes, expands, and then thaws, which can lead to cracks or scaling.
Sealing your Exposed Aggregate Driveways and Other Concrete Surfaces
Once you’ve managed to clean exposed aggregate surfaces thoroughly, it’s always best to apply a concrete sealer for maximum protection.
Applying a sealant provides an extra layer of protection against future staining and damage from environmental factors.
Ideally, reseal your driveway or patio every two years or as recommended by professionals. The sealant will not only keep moisture out but also make future cleaning tasks less labour-intensive as it prevents debris from embedding into the surface.
Choosing the right sealer depends entirely on your specific needs and weather conditions in your area.
There are different types available in the market — some enhance the colour of your aggregate, while others provide a matte finish.
Sealing should also be done once every few years, depending on the wear and tear your concrete suffers. This will protect it from water, grease and oil stains, wear and tear, and even ultraviolet rays.
How Stone Protection Can Help You Keep Your Exposed Aggregate Driveways Clean and Pristine
For many homeowners, the allure of cleaning their exposed aggregates themselves lies in savings and personal satisfaction from doing a job well. However, some stains and damage need professional eyes to be addressed properly.
Stone Protection offers services that will not just clean your aggregate concrete but also revitalize your stone surfaces and bring back their natural shine.
Contact us today for a consultation!
Frequently Asked Questions
How long does exposed aggregate last?
Exposed aggregate can last for several decades with proper care and maintenance. It’s not uncommon for it to last 30 years or more.
However, the exact lifespan can vary depending on factors such as the quality of the installation, the type of aggregate used, and the local climate conditions.
How do you make exposed aggregate look better?
You can make exposed aggregate look better by keeping it clean and well-sealed. Regular washing, using a good quality sealer, and filling any cracks promptly can help maintain its appearance.
How long should you wait to wash exposed aggregate concrete?
It’s best to wait at least 24 hours before washing exposed aggregate concrete after it’s been sealed to allow the sealant to fully cure.
What happens if you don’t seal exposed aggregate concrete?
If you don’t seal exposed aggregate concrete, it becomes susceptible to wear and tear, discolouration, and damage from water and chemicals. It can also cause the stones to loosen over time.
Why is my exposed aggregate blotchy?
This situation may happen due to uneven sealing or absorption of the sealer. It usually happens when the sealant is not properly applied or if some areas of the concrete are more porous than others.
Does exposed aggregate require maintenance?
Yes, it does! Regular cleaning and resealing every few years can preserve its appearance and durability.
Can I clean exposed aggregate concrete the same way I clean plain concrete?
No, exposed aggregate concrete requires different cleaning methods compared to plain concrete due to its unique surface texture.
What is the recommended way to remove oil stains from exposed aggregate concrete?
The best way to remove oil stains is to use a cleaning solution with pressure washing to wash away the stains effectively.
