Cracks in concrete fall into two general categories : static and moving. Static cracks are hairline flaws that only affect the concrete surface. In most cases, they require little or no repair. Moving cracks, also called active cracks, are more serious. These cracks often are structural in nature and continue through the entire depth of the concrete. There are several causes, including insufficient spacing and sequencing of control joints, not isolating new concrete from old, and improper subgrade compaction.
If we encounter moving cracks, we typically repair them before resurfacing the slab. Even though we use the most sophisticated materials and cutting-edge techniques to fix cracks, there are no guarantees that the cracks will not reform and mirror through to the overlay. When the existing concrete slab is veined with large cracks we usually recommend replacing the slab with new concrete instead of repairing.
If the concrete has static cracks (very shallow cracks that do not affect the integrity of the concrete ), in most cases, repairing them can be avoided with normal surface preparation.
These are the two most common static cracks that we encounter:
=> Craze Cracks: craze cracking, also called random map cracking, is a series of fine random cracks caused by shrinkage of the surface mortar. They are irregular in shape and and typically cover a small area.
=> Plastic Shrinkage Cracks: occur usually 1 to 3 feet apart and show up within the first 24 hours after concrete placement. They are caused by a rapid loss of water from the surface of fresh concrete before it has set.
Concrete surface preparation may require patching holes and repairing cracks. Patching can be done effectively with most cement grouts and mortars. Patches, however, do not always blend in color with the rest of the floor, and they do not always accept concrete stain in the same manner as the concrete.
If the repairs are small and few in number, they may not stand out, or artists' tints and faux finishing techniques may be used to disguise them. Even if they do stand out, such as large patching from plumbing repairs or upgrades, the look is usually acceptable.
But to remove all signs of patching, a concrete overlay is usually required, and a concrete overlay is always required to remove all signs of crack repairs. For this reason, cracks are usually left alone, unless they present a structural concern. Regardless, cracks almost always add to the look of acid-stained concrete by providing a more natural stone appearance. Many customers actually want cracks with their stained concrete.
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For PA: Philadelphia, Langhorne, Yardley, Newtown, Doylestown, New Hope, Morrisville, Wayne, Bryn Mawr, Haverford, Lansdale, Blue Bell,
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