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| I have an old home slab that we plan to use for parking of cars and light trucks. Attached is a picture of the slab. It is 28 ft wide and 110 ft long. Halfway down the slab there is a crawl space that is 28 ft long and 4.5 ft wide and 4 ft deep. There is a 2'x2' access in the slab to get to the crawl space.There is 5 1/2" of concrete over the top. The sidewalls of the crawl space are concrete blocks on a foundation. The second picture is inside the crawl space. Will 5 1/2 in of concrete with a bridge length of 4 1/2' hold up cars and light pickup trucks? The slab is about 50 years old and I don't know if there is any reinforcing in the concrete.
I am trying to decide if the crawl space need to be filled in and concrete poured to support the existing slab.
 (IMG_20231028_092114352_HDR (full).jpg)
 (IMG_20231227_122709091 (full).jpg)
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 IMG_20231028_092114352_HDR (full).jpg (143KB - 128 downloads)
IMG_20231227_122709091 (full).jpg (97KB - 134 downloads)
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How far can you bridge concrete?
