Readers ask: Joining New Concrete To Old Concrete?

Can you pour new concrete over old cracked concrete?

There are situations when pouring new concrete isn’t the most suitable option. For instance, surfaces with larger cracks, heaving or settling conditions, or where height cannot be raised, replacement is a better solution. However, in most cases, you can pour a new layer of concrete onto the existing one.

Will cement stick to concrete?

The cement within a concrete mix doesn’t contain any natural bonding agents – so when fresh concrete is added on top of an existing layer of concrete, the two won’t join together. Once cured, the new concrete will simply sit on top as a separate layer. This will not produce a strong, serviceable floor.

Can you put a thin layer of concrete over concrete?

Yes, you may pour a concrete pad overlay over an existing slab. You need to consider the added height and weight of the overlay on the existing structure. Overlays may include polymers, portland cement concrete, or epoxies.

What is the best concrete overlay?

Broom Finish Concrete Overlay SureBroom is our strongest overlay, has the largest aggregate, and is suited for the highest wear surface including vehicular and foot traffic. Trowel or spray applications.

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What do you use to bond concrete to concrete?

QUIKRETE® Concrete Bonding Adhesive (No. 9902) permanently bonds new concrete, plaster, and stucco to existing concrete, plaster, and stucco. Eliminates the need for roughing the surface before the application.

Will concrete overlay last?

Concrete overlays are only as good as the surface, it is being applied to. You need to keep in mind that if the concrete is cracked or surfacing up, then the overlay will also break and come up. You need to be sure that if the concrete is heavily damaged, your overlay won’t last long.

How thick does a concrete overlay need to be?

The minimum recommended thickness is 1 to 2 in. ( 25 to 50 mm ) for a fully bonded concrete overlay placed on a base slab that is practically free of cracks and in which the concrete is sound, clean, and of good quality.

Will concrete overlay crack?

Unfortunately, most concrete has a tendency to crack, usually as a result of improper design or poor construction practices. As an overlay installer, you have no control over these factors. You are responsible for repairing any cracks in the existing concrete before resurfacing.

Can you overlay a concrete driveway?

If your driveway needs a whole new look, a decorative concrete overlay will create a new finish that covers minor surface damage like cracks, imperfections and discoloration. The overlay creates a durable finish and long-lasting bond with the original concrete that will not chip, crack or peel.

Can old concrete be resurfaced?

Concrete resurfacing is a way to make damaged or dated concrete look new again. A concrete coating is applied over the old surface, offering a variety of color, texture and pattern options. This type of decorative refinishing can be done on driveways, patios, pool decks and even indoor floors.

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