Forces acting on pipe submerged in drying cement

[robkm]

I need to analyse what's 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.

 

[sir-pinski]

There are a few other forces that should be considered when analyzing the situation of a hexagon pipe submerged in drying cement.

Firstly, there will be a shear force acting on the pipe due to the viscosity of the cement. As the cement dries and becomes more solid, it will create a resistance against the movement of the pipe, resulting in a shear force. This force will also increase with depth as the cement becomes denser.

Secondly, there may be a lateral force acting on the pipe due to the expansion of the cement as it dries. This expansion can cause the cement to push against the sides of the pipe, creating a lateral force.

To calculate these forces, you will need to consider the dimensions and properties of the pipe and the cement, as well as the depth of the pipe in the cement. This will involve using equations for buoyancy, hydrostatic pressure, shear force, and lateral force. It may also be helpful to consult with a structural engineer for a more thorough analysis.

Overall, it is important to consider all of these forces when analyzing the situation of a submerged pipe in drying cement to ensure the structural integrity of the pipe and the stability of the surrounding cement.