strange concrete failure

[4000sposse]

This looked strange to me, this concrete failed in two relatively small spots at the surface, and has some cracking connecting the spalled/broken concrete. This driveway has radiant heat, I suspect a connection between the radiant heat and this broken concrete.

Anyone seen what causes this?

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[mjr6550]

This looked strange to me, this concrete failed in two relatively small spots at the surface, and has some cracking connecting the spalled/broken concrete. This driveway has radiant heat, I suspect a connection between the radiant heat and this broken concrete.

Anyone seen what causes this?

Click to Enlarge

25.05 KB

I noticed that cracks converge at those two spots. This could be caused by shrinkage or expansion if the concrete was poured tight to an object like a pipe manifold, large stone or old broken piece of concrete, etc.