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  1. rayhines

    Is Buoyancy of Wet Concrete an issue?

    Thanks Dick, the reason the concrete is only to the top of the pipe is that the pipe will act as a spoon drain, after I cut some slots in the top of it. It is behind a basement retaining wall. The idea is that any ground water that meets the wall is directed down to the pipe and runs away to...
  2. rayhines

    Is Buoyancy of Wet Concrete an issue?

    Thanks Mike, all I can do is put some concrete blocks at set intervals to keep it down, i will try to block outlet and fill with water. Any idea how much it will tend to lift? Given the high viscosity of the concrete - 80 slump, I thought the uplift effect may not be significant? ie the...
  3. rayhines

    Is Buoyancy of Wet Concrete an issue?

    Hi, I found this thread that speculated on the effective buoyancy of a vessel floating in wet freshly poured concrete: thread167-14699 though no final conclusion. I have setup a 4 inch pvc pipe in a trench with a specific fall which i want to maintain. Pipe is propped on bricks. I am going...

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