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No, wet concrete will not bond to dry concrete without an additional bonding agent. The common alternative is adding a sand or gravel layer under a concrete slab to enhance bonding and create a stable foundation. The right choice depends on the height and thickness of your two slabs, local laws, and the use of the specific concrete slab.

Unfortunately, concrete cracks happen, so there’s no surefire way to avoid them long-term. To slow down the cracking, apply a sealant every two to three years and use sand rather than salt to melt snow or ice. Using salt speeds up the freeze-thaw cycle, which may increase the likelihood of cracking. Additionally, keep vehicles and heavy machinery off of your concrete, as the weight can lead to more cracking.

Yes, you should seal your exposed aggregate concrete to keep it protected from the elements and reduce the risk of cracking and concrete spalling. You’ll need to invest in the cost of resealing your concrete about every three years to keep it in good condition. Unsealed exposed aggregate concrete is susceptible to water damage, stains, chips, cracks, and abrasion. Sealers are available in various finishes and levels of gloss. Outdoor exposed aggregate concrete should be sealed with a non-yellowing, UV-resistant sealer to preserve the look of the finish.

In most cases, you will need a building permit for cement work on your property. You need a permit for any project that adds a permanent foundation on your property—which, in most cases, includes even a flat slab of concrete poured directly on the ground. Building permits for concrete projects usually cost between $100 and $500, although this can get higher for larger projects. You can always ask your cement company if a permit is necessary for your project, and the expert will typically pull the permit for you to save you time and energy.