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Composition: Exposed aggregate concrete is made from the same basic ingredients as regular concrete, including cement, sand, gravel, and water. However, it has an added element – decorative aggregates like pebbles, stones, glass, or shells.
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Installation: To create exposed aggregate concrete, the process begins with pouring a standard concrete mix onto a prepared surface, such as a driveway, patio, or sidewalk. Afterward, the decorative aggregates are spread evenly across the surface while the concrete is still wet.
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Surface Retarder: A surface retarder is often applied to the top layer of the concrete. This chemical delays the curing of the top layer, making it easier to remove and reveal the aggregates underneath.
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Finishing: Once the concrete has partially cured, typically within a few hours, the surface is washed and scrubbed using a pressure washer or stiff brushes to remove the top layer of cement paste. This exposes the decorative aggregates, creating a textured, pebble-like appearance.
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Aggregate Choices: Homeowners can choose from a wide range of aggregate materials, shapes, sizes, and colors, allowing for customization to match the desired aesthetic.
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Durability: Exposed aggregate concrete is known for its durability and resistance to wear and tear. The exposed aggregates add strength and make the surface less susceptible to damage from heavy traffic or freeze-thaw cycles.
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Slip Resistance: The exposed surface of the aggregates provides natural slip resistance, making it a good choice for areas where safety is a concern, such as pool decks or walkways.
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Aesthetics: Exposed aggregate concrete offers a natural, earthy appearance that complements various architectural styles. It can also be customized to match or contrast with the surrounding landscape or structures.
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Maintenance: While exposed aggregate is relatively low-maintenance, occasional resealing may be necessary to protect the surface and enhance its appearance over time.
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Applications: Exposed aggregate concrete is commonly used for driveways, patios, sidewalks, and pool decks. It can also be used for interior floors in some settings.
In summary, exposed aggregate concrete is a decorative and durable option for various concrete applications. Its unique appearance, slip resistance, and customization options make it a popular choice for homeowners and builders looking to enhance the aesthetic and functionality of their concrete surfaces.
