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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.

For homeowners, it’s better to dry grind concrete. Dry grinding is the method described above and can be done by experienced DIYers for smaller projects. Wet grinding requires a big volume of water, a way to collect the slurry created by the water and dust, and an environmentally-safe place to dispose of the slurry. In general, only professionals do wet grinding.  

Labor and pouring adds between $8 and $18 per square foot to your total for concrete delivery. Especially for larger projects, it’s usually a good idea to hire a professional concrete delivery company when it comes to installing concrete surfaces even though it will undoubtedly cost more to hire a pro to do the work for you.

Yes, you can pour a concrete slab on dirt, but only if you follow specific requirements. A wooden frame is a must, and the soil layer used for the base must be wet enough, thick enough, and compact enough to support the weight of the concrete slab. Consult with a concrete contractor to ensure you have the base you need.