Cold joint in a basement wall exposed to high water table

[chekre]

Hello

When pouring a basement wall of 300mm a problem occured in the batch plant which led to a concrete delay of 5 hours (half of the basement wall was poured). A cold joint was formed as noticed in the picture. The basement wall is resisting a soil pressure as well as a high water table. While the flexural reinforcement is more than enough while checking the shear friction, my main concern is at the time where the construction finishes and the operations of dewatering stopped. This joint will have to be exposed to a permanent water pressure which may let the water infiltrate inside the parking. To be noted that the shoring syatem consists of a temporary diaphragm wall and a reinforced concrete basement wall. The D wall is waterproofed. So the risk of infiltration is limited but would like to hear your opinions.

 

[MotorCity]

No picture attached. I share your concern about water infiltration (even without a high water table). Since the wall is already poured and I assume a waterstop was not installed in the joint, I recommend that you chip out a vertical groove along the cold joint and inject a polymer/resin/epoxy/urethane that expands in the presence of water and seals the joint. Hopefully you have a perimeter wall or foundation drain that will also help mitigate the water issue.

 

[chekre]

Here is the picture.

 

[SlideRuleEra]

Seal the joint, as recommended by MotorCity
Install bentonite waterproofing panels to the exterior of the concrete.

Since the wall is already in place, some of the preparation steps cannot be performed. Follow the installation instructions as closely as possible:

Bentonite Waterproofing System

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[darthsoilsguy2]

with properly applied waterproofing you should be fine. make sure they are putting a waterstop in. don't have a good angle on it but don't see one sticking out.

 

[chekre]

Thank you for the comments.

 

[BAretired]

Has the slab on grade been designed to resist upward pressure from the high water table?

BA

 

[chekre]

There is no slab on grade. It is a mat foundation supported by tension piles.