Dare Concrete - Outer Banks, North Carolina
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Concrete Repair

Crack Repair

Surface Repair

Structure Repair

 

 

 

 

 


CRACK REPAIR

For centuries, concrete has been known and used for its properties of strength, durability and ease of use. And while problems with the use of concrete are typically cosmetic – hairline cracks, chipping or spalling, etc. – usually due to too much water in the concrete mix, and finishing techniques. It is commonly seen in flatwork (slabs, driveways and sidewalks) the appearance of cracks, originated by settlement due to an improper compacted sub-base. The concrete surface becomes uneven and separation occurs. Structural cracks are usually a cause of inadequate construction techniques, proper joint spacing and reinforcement. Shrinkage cracks are related to the concrete hydration process, quality of the mix design - the water cement ratio in the mix, etc. That’s little consolation for the owner, who has to deal with the problem. Permanently repairing cracks in poured concrete is a challenge for do-it-yourselves and pros alike. In most cases, cracks under 1/8 inch wide don’t pose a structural threat; they may look bad, but they may also give water, insect and possibly radon a path into the home or building. Caulking the crack is a temporary fix, because caulk won’t stop water that’s under pressure. Undercutting a keyway with a cold chisel and a hand-drilling hammer, then patching with hydraulic cement, is slow, hard work. Waterproofing the crack can be done through epoxy or urethane injection, which is also known as chemical grouting. Epoxy injection is best if the crack is dry. Under wet conditions, polyurethane, which uses a resin activated by water, can be used. By injecting epoxy or polyurethane resin under pressure into cracks, concrete structures can be glued back together again. The next step would be waterproof the surface, preventing water from permanently going through the surface. Various methods are used in external dampproofing and waterproofing. These include liquid membranes, applied by spray, roller or trowel. The liquid, which may range from polyurethanes to polymer modified asphalt, cures into a rubbery coating on the surface. The waterproofing step is usually done in basement and foundation walls, parking lots with multiple levels, and building decks and balconies, where water leakage represents a big problem. Patching and resurfacing the concrete surface after the crack is repaired, would be a cosmetic alternative to beautify and add value to the property. Click here for Resurfacing Options – Overlay Systems.

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