About 145 degrees Fahrenheit.
Concrete can reach temperatures of up to 572 degrees Fahrenheit (300 degrees Celsius) before it begins to lose its structural integrity and strength. After this point, it may start to crack, spall, or experience other detrimental effects.
If the correct concrete mix is used and laid properly, hot weather should not make concrete crack. Instead, it is the freeze-thaw cycle that makes concrete crack.
Could be a thermostatically controlled heating source embedded in the concrete, or it may be that the concrete is absorbing heat from the sunlight to which it's exposed.
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Yes. I know that firsthand.
A little bit, but not much. If it is really hot, and then really cold, then your cement will crack.
Yes, concrete has form of "salvatory" element in it's mixture which can conduct heat or cold. Like on a sunny afternoon, the concrete becomes hot; likewise, on a cold night, the concrete becomes cold.
It might be possible to melt concrete if lava in contact with it was hot enough. But it is more likely that concrete would decompose and become "crumbly" before it "melted" when heated.
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Either avoid walking on the concrete, or make sure your feet are always wet. This will help protect you from the burn of the concrete. Just make sure to dip them in the water every now and then.
When installed properly and correctly, a copper line from heating system can be used to heat concrete slab.