Underwater Cement

   / Underwater Cement #1  

rScotty

Super Member
Joined
Apr 21, 2001
Messages
9,525
Location
Rural mountains - Colorado
Tractor
Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
I need to repair some cement structures in my pond. It's going to involve attaching some clean cement blocks to some clean cement culvert - and then the whole thing will be put in the pond to stay. There won't be much stress on it, at least there won't be as long as the cement holds it all together. Does anyone have a recommendation on what type of cement to use for this kind of work?
thanks,
rScotty
 
   / Underwater Cement #2  
Any mix with portland cement can be poured under water, and cures harder than air cured - one of the tricks is keeping it from moving til it sets. In a pond the water should be still enough for that NOT to matter... Steve
 
   / Underwater Cement #3  
I had to use Sodium bentonite clay around the drain pipe.
 
   / Underwater Cement #4  
Hydraulic cement. Edited hydraulic cement is Portland Cement. As stated above by BukitCase.
Age got the best of me on this one. Forgetful sometimes.
 
Last edited:
   / Underwater Cement #5  
Moving/placing a cement structure is more concerning than the hydraulic aspect. Cement has low tension strength unless reinforced.

Used a product called surewall, a high strength, fiber reinforced surface bonding cement successfully on several repair projects. Great adhesive strength, waterproof and tensile strength to prevent cracking. Downside it’s more expensive than cement.
You could coat over a cement project to make stronger.

Be sure to clean your mixing/handling tools before letting it set. Like I said high adhesion.
 

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