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There isn't a winner when comparing expanding foam versus concrete for fence posts. Both have benefits and drawbacks, depending on your budget and priorities. Expanding foam may be a better choice if you want a more eco-friendly solution that cures faster. Concrete is more affordable and durable than expanding foam, yet it is harder to work with and takes longer to cure. 

In terms of durability, concrete driveways can last more than 50 years when properly maintained, compared to the typical 30 years for an asphalt driveway. However, the durability depends on the climate, base material and thickness, and thickness of the concrete or asphalt used. The longevity of concrete or asphalt driveways also depends on how well it’s maintained and the amount of wear and tear it endures.

When pouring a new concrete slab, you should consider how additional costs will affect your total, including reinforcements, decorative enhancements, finishing, and curing. It's also important to consider local laws regarding the grade, drainage, and permits for installing concrete on your property. Speak with your professional about the ideal thickness for your slab, and also consider whether you’ll need drainage for slab longevity.

You should put gravel that is 3/4 to 1 inch under a concrete slab. However, depending on the project, local building codes may dictate the proper gravel size and shape. Some concrete slabs that do not hold significant weight may have a subbase of sand. Also, keep in mind that the subbase you choose will affect the cost of your concrete patio, walkway, or driveway.