Does Marble plaster delaminate if pool drained?

[tomfrh]

I am currently renovating our old marble plaster pool. The marble plaster has been sandblasted.

I have heard marble plaster can delaminate if a pool is left empty for too long.

Does anyone have experience with this? How long before it delaminates if its going to do so? Why does it delaminate? Is it the drying shrinkage?

 

[Texas Splash]

Tom, since your post has gone so long with no answer, I'm going to tag @onBalance to see if he can help with your questions. Thanks for posting.

 

[tomfrh]

Since asking my question ive found a couple of
sections which have delaminated and become drummy.

I read on another forum that it is due to thermal movement of the plaster layer, ie when the plaster changes temperature too quickly, causing it to grow (or shrink) at different rate to the underlying concrete, resulting in bond failure between the materials.
This makes sense, as it has occurred only in thicker areas (which could presumably develop a larger thermal expansion force due to increased cross section), and has occurred in areas where the sun in shining on the plaster.

This makes sense, as it has occurred only in thicker areas (which could presumably develop a larger thermal expansion force due to increased cross section), and has occurred in areas where the sun in shining on the plaster.

thinner areas which are by now very dry remain well attached to the concrete.

I also spoke to the pebble plasterer will do our resurfacing. He said marble plaster delamination happens “all the time”, with the best protection being to refill the pool.

 

[proavia]

It sounds like you are going to replaster. If that is correct, are they not going to do a full chip out? I would want all the old plaster removed as that would insure there were no hidden areas that were delaminated. At the very least, any areas that are showing signs of delaminating need to be fully removed. Also, I believe a bond coat should be applied before new plaster is applied.

 

[onBalance]

My observations have indicated that a "thin" plaster coat often delaminates.