Common Customer Questions About Exposed Aggregate Concrete
1. How Do You Clean and Seal Exposed Aggregate Concrete?
Cleaning and sealing is essential to maintaining its durability and aesthetic appeal. Over time, dirt, grime, and stains can accumulate, making the surface look dull.
Cleaning Process:
- Start by sweeping away loose debris and dirt using a broom or leaf blower.
- Use a garden hose or pressure washer to remove surface dust and grime. If using a pressure washer, keep the nozzle at a safe distance to avoid damaging the concrete.
- For stubborn stains, apply a mild detergent or a specialized concrete cleaner and scrub the area with a stiff brush. Avoid harsh chemicals like acid-based cleaners, as they can erode the concrete.
- Rinse thoroughly and let the surface dry completely before sealing.
Sealing Process:
- Choose a high-quality concrete sealer suitable for exposed aggregate surfaces. Penetrating or film-forming sealers are commonly used.
- Apply the sealer with a roller or sprayer, ensuring an even coat over the entire surface.
- Allow the first coat to dry as per the manufacturer’s instructions before applying a second coat if needed.
- Keep the area free from foot traffic and moisture for at least 24 to 48 hours to ensure proper curing.
Regular sealing every two to three years helps protect against moisture, stains, and surface wear, keeping the concrete looking fresh and enhancing its longevity.
2. How Does a Snowblower Perform on Exposed Aggregate Concrete?
Using a snowblower on the concrete requires caution. The textured surface can make snow removal slightly more challenging than smooth concrete, but with the right approach, it can be done effectively.
Performance Considerations:
- Single-stage snow blowers are not ideal, as their rubber paddles can catch on the exposed stones, leading to wear and potential damage.
- Two-stage or three-stage snow blowers are better suited because they have augers that do not make direct contact with the surface.
- To prevent damage, adjust the height of the auger or skid shoes so that the metal parts do not scrape against the aggregate.
- Using plastic or rubber paddles instead of metal blades can help minimize wear and tear.
To avoid excessive wear, consider using alternative snow removal methods such as a plastic snow shovel or a snow melt solution that is safe for concrete surfaces.
3. Can You Put Exposed Aggregate Over Existing Exposed Aggregate Concrete Walls?
It is possible to apply a new layer of aggregate concrete over an existing surface, but it requires proper preparation and the right bonding techniques.
Process for Applying Exposed Aggregate Over Existing Walls:
- Surface Preparation: The old concrete surface must be thoroughly cleaned to remove dirt, oil, or loose debris. A pressure washer or concrete cleaner is recommended.
- Applying a Bonding Agent: A bonding primer or adhesive must be applied to help the new concrete adhere to the existing surface. Without this step, the new layer may not properly bond and could crack over time.
- Adding the New Concrete Layer: A fresh layer of concrete is poured over the existing surface, followed by embedding aggregates into the top layer before it sets.
- Finishing and Curing: After exposing the aggregate using a surface retardant or washing technique, the new layer needs proper curing for durability.
While it is possible to overlay, it is always best to consult a professional to ensure structural integrity and avoid potential cracking or delamination.
4. Is Exposed Aggregate Cheaper Than Stamped Concrete?
The cost of exposed aggregate concrete versus stamped concrete depends on factors like materials, labor, and the complexity of the design.
Cost Comparison:
- Material Costs: It typically requires high-quality aggregates, while stamped concrete involves colored pigments and stamping tools, making material costs relatively similar.
- Labor Costs: Stamped concrete often requires more intensive labor, as it involves stamping patterns and applying color techniques.It requires less intricate finishing but still involves skill in washing and revealing the aggregates.
- Longevity and Maintenance: Exposed aggregate is highly durable and requires minimal maintenance, whereas stamped concrete may need periodic re-coloring or resealing to maintain its appearance.
Overall, exposed aggregate concrete is often slightly more affordable than stamped concrete, particularly for large-scale projects like driveways and patios. However, pricing can vary based on design preferences and installation complexity.
5. What Are Some Alternatives to Concrete Sealers for Exposed Aggregate Driveways and Walkways?
If you prefer to avoid traditional concrete sealers, there are several alternative options that can help protect exposed aggregate concrete from wear and weather exposure.
Alternative Sealing Methods:
- Silicate-Based Densifiers: These penetrate deep into the concrete, strengthening the surface and reducing moisture absorption without creating a glossy finish.
- Natural Oil Treatments: Linseed oil or tung oil can provide mild protection, but they require frequent reapplication and may darken the surface over time.
- Beeswax or Polyurethane Coatings: While these are not common, they can offer some level of water resistance, though they may alter the natural appearance of the aggregate.
- Penetrating Water Repellents: These are designed to reduce water absorption without forming a film on the surface, making them an excellent choice for maintaining the natural look of exposed aggregate.
Traditional sealers remain the most effective way to protect exposed aggregate driveways and walkways, but these alternatives can be used in cases where a different finish is preferred.
6. How Long Does an Exposed Aggregate Finish on Concrete Last Before It Needs to Be Sealed?
The lifespan of an aggregate concrete finish depends on factors such as weather conditions, usage, and maintenance practices.
Typical Timeframe for Resealing:
- In moderate climates with minimal wear, a sealer can last two to three years before reapplication is needed.
- In high-traffic areas or regions with harsh weather, sealing may be required every one to two years to maintain protection.
- If the surface becomes dull, absorbs water quickly, or shows signs of cracking, it is a clear indication that resealing is necessary.
Factors That Affect Sealer Longevity:
- Sun Exposure: UV rays can break down sealers over time, causing them to lose effectiveness.
- Foot and Vehicle Traffic: High usage areas will wear out faster and require more frequent sealing.
- Cleaning Practices: Harsh chemicals and power washing can strip sealers prematurely, requiring earlier reapplication.
To extend the lifespan of exposed aggregate concrete, regular maintenance, proper sealing intervals, and avoiding abrasive cleaning methods are recommended.
Conclusion
Understanding the proper care, costs, and alternatives for exposed aggregate concrete ensures its long-lasting durability and visual appeal. From cleaning and sealing to selecting the right installation techniques, taking the right steps can enhance its performance for years to come. Whether using a snowblower safely, choosing an alternative to sealers, or considering an overlay, professional guidance is always recommended to achieve the best results