Forces acting on pipe submerged in drying cement

[robkm]

I need to analyse whats going on when a hexagon pipe is submerged in drying cement.

The pipe is hollow with a thickness and is hexagon shape, where the hexagon is pointing up. It is submerged in standard cement, where the top point of the hexagon is about 100mm from the suface.

I understand when the cement is poured in, buoyancy forces act on the pipe pushing it up. Hydrostatic pressure is also acting on the pipe, imncreasing with depth. is there anything else needed to be considered and how would you calculate the forces.

thanks for any feedback

[LeonStanley]

Pretty sure there is negligible contratction during the curing process. Also with temperature change, the expansion and contraction coefficients of concrete are very similar to steel, and would not usually present a problem to plastic pipes. I have observed that copper pipes are usually wrapped in foam or fabric - but I think that is due to them often being used to convey hot liquids. If the pipe is tied down to say the steel reinforcment, it will not float upwards during the vibration process when the concrete is being poured.