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If left unaddressed, these slab cracks can allow moisture to work its way down from the surface and into the concrete, further expanding the crack and deteriorating the area around it. It’s important to ensure the integrity of these coatings and prevent slab cracks from telegraphing through to the surface and compromising the finish. These interior or exterior slab coatings serve many purposes, either decorative or for safety.
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It’s important to add tensile strength across cracks with products like carbon fiber to resist this movement.Ĭoncrete slabs and coatingsOftentimes, contractors need to fill and reinforce slab cracks because a coating will be applied to the surface such as that found on a pool deck, garage floors as well as commercial floors. Some contractors repair concrete with more concrete, but this method only fills the crack and does not provide any tensile strength, only the bond strength, which is not strong enough to resist the typical movement. Permanently holding the crack together with high strength, non-corrosive carbon fiber reinforcement products such as RHINO Carbon Fiber Concrete Crack Lock will ensure that the slab cannot pull apart once it’s filled. If the weak point is not addressed, the lack of reinforcement and movement in the slab causes it to fail. However, the slab may still break open along the weak point - the fractured concrete along the crack itself where small hairline fractures often appear but are sometimes hard to see. Filling and bonding the slab back together with a high strength epoxy is a great way to seal the crack. Repair methods and solutionsCommon ways to repair a slab are to surface fill or inject with epoxy or polyurethane. This not only translates into health problems for inhabitants, but also damage to any organic materials such as furniture within proximity. In a basement environment, soil gases such as radon and moisture can migrate through these cracks and the excess moisture seeping through can lead to mold and mildew problems. In residential structures, cracks and movement in slabs are problematic, especially when covered with finished surfaces such as tile or hardwood. Solutions with carbon fiber, however, provide a more permanent fix as the material is used to repair, reinforce and strengthen not just the damage and crack itself, but the affected area resulting in a fail-proof solution.Ĭommon problems with concrete slabsIn commercial projects, depending on how concrete slabs were constructed, cracks can appear from lack of steel, poor concrete mix, insufficient thickness, settlement, hydro-static pressure or ground movement. Oftentimes cracks in slabs are repaired by epoxy injection or filling the surface of the crack, and while that may appear to fix the problem, these repairs usually fail and result in call-backs or further problems. Concrete slabs can crack or damage for a variety of reasons depending on how they are used and how they were constructed. Slab repairs are often overlooked and contractors may even shy away from discussing slab cracks due to the lack of permanent solutions. The week joint of the cold slab may still crack, but with the rebar connecting the two portions of the slab, the cement will not shift and form a displaced fracture of the cement.The cracks in this garage floor have been stabilized with RHINO Carbon Fiber Concrete Crack Lock and it is now ready for a coating.Ĭoncrete slabs serve a variety of purposes, however when it comes to providing a permanent or lasting solution for cracks, options sometimes appear slim. After the second portion of the concrete is poured, the rebar serves as a connection between the two slabs. If the second portion of the pour will be more than two or three hours after the first portion the rebar should be set in the first portion while it is still wet. Place reinforcing rods between the first portion of the slab and the new pour. If successful, this blending of the two concrete pours will provide the strongest slab that is the least likely to crack. How hard, or setup, the first pour of concrete has become will determine if this is possible. Use a concrete vibrator to work the two sections into a single mix of concrete as much as possible. Mix the concrete from the earlier portion of the pour with the fresh concrete, if possible. Repairing Cold Joints While Pouring Cement