Providing a Watertight Construction Joint by Surface Preparation? 1

[sswan60]

I'm looking for some type of reference that supports producing a watertight construction joint by sandblasting or water jetting the surface of the first pour to 1)remove laitance, 2)provide roughness, and 3)enable the new pour to bond directly to the first pour's exposed aggregate.

My application is liquid manure storage structures, usually 6' - 12' in depth with 8" - 12" thick concrete walls. Most states require waterstops in such joints which some consider unnecessary.

Thank you.

 

[ATSE]

Use a waterstop.

 

[Ron]

Agree with ATSE

 

[dik]

I often use bentonite 'rod'... works like a charm and easier to apply than most poly water stops.

Dik

 

[JedClampett]

Sure, anything that is more work some contractors/engineers will think is unnecessary. How much manure "juice" would you want in your house?

 

[oldestguy]

Don't forget that concrete shrinks. That's why there are either sawed joints or, as in your case, separate pours to make a place for shrinkage, rather than some random cracks developing.

 

[Everynameistaken]

I agree a water stop is required.

What about a sealant groove detail on the inside?

Does anyone have a good detail for sewage exposure?

For potable water we often use backing rod and sika "goop" to fill the void, but for sewage exposure not sure this detail works?

 

[MotorCity]

Curious....what state documents require waterstops? I believe all states have adopted IBC, is it in there?

 

[JedClampett]

EPA Title 40 CFR 265.193