Dowel Bar Oil / Epoxy / Plastic Sleeves
Dowel Bar Oil / Epoxy / Plastic Sleeves
(OP)
So I am designing a concrete pad via ACI360. For a unreinforced concrete pad it recommends dowel rods at joints with oil used as a bond breaker from the concrete. I have searched online for a standard on what type of oil / epoxy / sleeves to use, but nothing is coming up.
Can anyone point me in a direction? Or is per the dowel rod manufacturer's recommendation? Dowel rods are constructed at a steel shop correct? So would they even know?
-Riversidean
Can anyone point me in a direction? Or is per the dowel rod manufacturer's recommendation? Dowel rods are constructed at a steel shop correct? So would they even know?
-Riversidean





RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
Mike Lambert
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
A steel shop would not know the purpose or the specifics of dowel use...just how to fabricate them. They should be smooth, round rod made of hardened steel. They should be sized in accordance with AASHTO requirements and spaced accordingly.
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
There are also many kinds of dowel assemblies, including plate dowels. These assemblies will work as long as they are used within their limits.
Be sure all dowels are parallel and do not put dowels near corners - the result of violating that will be restraint which will cause cracking and failure of the slabs. Keep dowels at mid-height or slightly lower (so any cracking will appear at the bottom, not the top of the slabs.)
The subgrade under unreinforced slabs needs to be adequate and stable.
If the slab is exposed, be sure the joints are sealed.
When placing the concrete, attend to curing to avoid curling as the top surface dries. Failure to do so increases the appearance of cracks and reduces durability.
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
Can you point me to a section Ron? I'd like to check this out. I've got AASHTO but I'm not well versed in it and it's a rather large document.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
In good humor I curse ACI / ASTM for not having a standard on dowel bar oil / release. Although that might make for great material for another circular they could sell....
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
You can use petroleum jelly as well.
If life gets really tough, go to the local grocery store, buy some Crisco and use that. You can also soak a piece of your kraft paper grocery bag in vegetable oil and wrap it on the dowel. Will work as well as any other. If your grocery store only uses plastic bags, wrap one of those on the dowel.....
My point is that this is not rocket surgery...break the bond...that's all.
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
It comes in various tape widths, of which I have used 2" wide on numerous UNbonded PT repair projects.
Denso Petrolatum Tapes link
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves
RE: Dowel Bar Oil / Epoxy / Plastic Sleeves