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Question:

I am curious, how much weight would 6 inches of reinforced concrete support using the standard portland cement?

I am just curious, if I were to use 6 inches of reinforced concrete, making a 'domed tunnel' 100 feet long, how much weight would it be able to support on top? I know a dome can take a lot of weight, but what would be the math formula for figuring this out?Reinforcement would be 5/8quot; steel re-bar creating a skeletal structure to inject cement into and around.

Answer:

To get the math done for this you would need the math and or engineering sections. They would also need the psi rating of the concrete and the diameter of the tunnel. Chances are six inches would only be thick enough for a small tunnel.
Portland cement reinforced will have a maximum sustained tensile strength of 2500 PSI. Monolithic dome construction utilizes Gunite which is the same material used for swimming pools, and can withstand 5000 PSI or greater as it must support water's weight of approx. 8 lbs per gallon.

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