Damping Test of Concrete & Steel Tube

[Clive S]

Very interesting. Have you thought about the concrete shrinking and so not adhering to the tube ?

[Tenson]

SBR reduces shrinkage compared with water, so hopefully it won't be a problem. However for my real build I will source expanding cement, or at least 'non-shrink' variety.

You can also get synthetic cement such Polycrete (Granite Resin Mortar) which is supposedly good at damping and really stiff.

https://www.vubaresinproducts.com/ep...ir-mortar.html

[Voicecoil]

Very interesting. Have you thought about the concrete shrinking and so not adhering to the tube ?

You could maybe add a very little bit of aluminium powder? this will cause the concrete to foam a bit.