In bored piles construction the concrete used for the piles is sent for to lab for testing.?

Question

When happen to the piles when the concrete fail the lab test?

Answer 1

You have to add more piles

Answer 2

This does not automatically mean that the concrete in the lab cylinders is representative of the concrete in the piles. Take a look at how the cylinders were cured. Were they mistreated (bumped, spilled, etc.) on their way to the lab? Were proper techniques used (ASTM Standards) when sampling the concrete and fabricating the specimens? If all else fails, perhaps some non-destructive in-situ testing can be performed on the piles to evaluate their strength. Also, an engineering analysis might need to be performed to see if the existing strength of the concrete piles will be adequate for design.

Answer 3

Hopefully you have designed your piles so you can have a weaker break then specified and still be usable. But sometimes, the pile has to be abandoned in place, with maybe a new pile augered into the ground and the pile cap re-designed. This can also happen if your augered pile does not reach the required depth, or you hit an impervious rock fragment that you can't bore through.

Answer 4

There are a few possibilities. Additional piles may be required. If the test failure is not too far off, and engineering analysis shows that the pile is still useable, then it can be incorporated into the work. But the contractor takes a pay cut.