Thread: Concrete Volume

Nope, you weren't paying attention.... his third para reads....

Additionally, if it is going into the ground, what would you recommend as a suitable waterproofing agent to be mixed into the concrete?

Thanks again!

I thought I'd answered that in the blank bit before I said "Cheers"!

For the record, NOTHING. Concrete itself doesn't need waterproofing just because it's in the ground, in fact a goodly dose of dampness for quite some time will assist in reducing shrinkage. (Not that shrinkage is likely to be a problem with one bag of mix which hasn't been wet too much.)

Back to my mushies now!!

P

Originally Posted by Cliff Rogers

Nope, you weren't paying attention.... his third para reads....

Additionally, if it is going into the ground, what would you recommend as a suitable waterproofing agent to be mixed into the concrete?

Greens Pancake mix??

Al

If you don't want any ground moisture coming up through your concrete, well then stick some Forticon plastic between the ground and the said lump of concrete.

Originally Posted by bitingmidge

].... I thought I'd answered that in the blank bit before I said "Cheers"!...

You call 3 more questions an answer??? Granted, you did address the question, eventually, I just had to have my 2 bobs worth.

Originally Posted by bitingmidge

Back to my mushies now!!

P

Wanta see if we can get this thread closed too?

Look out Al!!!!! (insert maniacal laugh here)

Originally Posted by ozwinner

Ok, now Im confused :confused:


Al :confused:

Read these 2 links, it will become clearer.... eventually.....
http://www.woodworkforums.ubeaut.co...ad.php?p=123968
http://www.woodworkforums.ubeaut.co...09&postcount=12

OK chaps, sorry for the confusion.....here is what I want.

I am placing an object into into the floor of my house, and filling the surrounds with concrete. I have a hole in my slab, ready for such a task, and the object in question is metal. I will have to break the plastic sheeting to dig this hole, and so my waterproof membrane below my slab will be compromised. The watertable isn't too far from the ground level, so to avoid rising damp troubles (and to stop metal object rusting from outside to in) I wish to waterproof the mix I put into the hole. Concrete itself isn't waterproof, so this should stop the damp issue cold.

Hopefully this is clear to you helpful folk.

Anyone wish to guess what I may be placing in the hole?

Make sure your post is galvanised, then coat it with a bituminous coating. Bondcrete can be used in your concrete mix, check their website for details. Also paint the edges of your old concrete with Bondcrete for better adhesion and maybe waterproofing the joint.
Apart from providing a seal for your concrete, the membrane also causes a glazed type of surface on the underside of your concrete slab when it is poured, thus adding to waterproofing.

Mr Termite,

it isn't a galv. post that I'm putting in. Also, I had a look at Bondall's website, and they don't recommend Bondcrete in a situation where the concret may always be wet. That shouldn't really be a problem below a slab, but it would be a bit hard to rip the item out in 5 years if it starts rusting out.

Cheers

Originally Posted by Fat Pat

I will have to break the plastic sheeting to dig this hole, and so my waterproof membrane below my slab will be compromised. The watertable isn't too far from the ground level, so to avoid rising damp troubles.....(snip)..

Anyone wish to guess what I may be placing in the hole?

It's not your ex is it?? :eek:

OK, it's a bit of buggering round, but dig round under the slab till you expose enough of the plastic to turn it down into the hole a bit. Line the hole with the same stuff and TAPE the joint. (This will also take a bit of buggering round, you'll need to fold the stuff into the hole, but try to keep it in one piece to avoid taping everywhere.

All the waterproof admixture in the world won't help if you have a high water table, becuase you are creating a "dry" joint in the concrete, the new stuff WILL shrink microscopically at best, and osmosis will do the rest.

Try to keep the new brew as dry as possible, the less water the smaller the probablility of shrinkage.

Good luck,

P (Rising Damp??? I have a leak every morning!!)

Pat, I wouldn't bother putting in a safe. Just bung your money in a shoe box under your bed and buy a Rotweiler - unless, of course, you are married to Amanda Vanstone.

Cheers
Richard

Originally Posted by Fat Pat

it isn't a galv. post that I'm putting in.

Well it should be because one vital component of rusting is oxygen and if oxygen can get to your steel then it doesen't take much moisture to form rust, eg fingerprints on a shiny chisel.

G'day Midgey,

no it's not my Ex, that was too many years ago, and the hole is too small. It's also too far from the edge of the house to be feasible. I think the option of lining the hole is the best bet, and using good old duct tape to hold it in place until the mud sets is best.

Daddles, you win. I juswt don't want the B###ard rusting out! And having been robbed a few times in the past, I don't feel like re-applying for a passport again! The Rottie is a good option, but not with a 3-month old little girl.

....Amanda Vanstone, now there is a fine specimen of a woman. Do you reckon her husband considers himself the luckiest bloke in the world? He now has twice the woman he originally married!

Amanda is spoken for, one member of this forum absolutely adores but I can't for the life of me remember who it was........