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What Causes This Type of Crack?

What Causes This Type of Crack?

What Causes This Type of Crack?

(OP)
The enclosed pictures show the lower edge of a pile-supported slab. Along part of the edge, the lower corner is showing a horizontal crack. What might cause this type of cracking? Corner reinforcement too close to the corner? Wet soil providing too much of a temperature gradient for the concrete as it cures?

Would love to hear the expert's thoughts...

Thanks!


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RE: What Causes This Type of Crack?

I'll go with too early form removal. There are some black dots, likely holes, below the crack. Likely some projections like nail heads, inside the form.

RE: What Causes This Type of Crack?

Did the formwork move slightly after final filling when the concrete was curing, but still green?

Is there a bulge in the footing or is that an optical / camera error. What does it look like in line?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: What Causes This Type of Crack?

What is the extent of the cracks going into the cap? Have you broken out a damaged bit to find out if it is limited to the corner alone? Is this only occurring in the wet soil?

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

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