Concrete Volume

[Fat Pat]

Do any of you fine folk know what VOLUME a 20 KG bag of pre-mixed concrete occupies?

I have a small project on the go, and part of it is to fill a hole in a concrete floor, and it has just occurred to me that I have no idea, and don't fancy making multiple return trips to the hardware store!

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

I haven't made a new post before, so this is all very exciting!

[bitingmidge]

Congratulations on losing your thread-virginity!!

I just happen to have a couple of bags lying around (ready to weigh down my next super-light experimental bench structure I guess :rolleyes: ), and in the fine print it says:

10 kg of this product spreads to 320 x 320 (0.10 square metres) to a depth of 50mm.

I'd be guessing that you could get a 20kg bag to stretch to 100mm deep, which means .10 sq metres x .1m = .01 cubic metres.

Double check by running a tape over the bag and multiplying depth x height x width. If the answer is close you'll know it's correct!

Cheers,

P

[Daddles]

Pat, I've used premix many times over the years and can tell you this as gospel - the amount you need will either be half what you mixed or twice what you mixed. Don't try to second guess it before hand because the job will warp itself to satisfy this immutable law of nature.

Richard

[simon c]

I don't know about pre-mixed, but for mixing up 1000 litres of 4.2.1 you need 1800kg agg & 350 cement & 200kg water. So dry weight of 2150kg. If you have 20 kg, it would give you 10 litres of compacted wet concrete. So I agree with midge.

But it will say on the side of the bag.

If it is quick set concrete, then it may be different as quickset has a lot more cement and therefore needs proportionately more water.

Simon

[ozwinner]

If it is quick set concrete, then it may be different as quickset has a lot more cement and therefore needs proportionately more water.

Simon
I thought they left out the gypsum to make cement set quicker??


Al :confused:

[Daddles]

I thought they left out the gypsum to make cement set quicker??


Al :confused:

Ah ha. Once again, we have the Official Thread Hijacker giving a serious reply to a thread. :eek: Is this a developing trend? :confused: Is this hallowed position in danger of being brought into disrepute? :eek:

Oh Al, Al. Please return to the path of light and illogical reason :D

Is there a pancake recipe involving premix? I dated a lady who seemed to think so - some of her pancakes still form part of an artificial reef off Glenelg :eek:

Cheers
Richard

[ozwinner]

Sorry.

[bitingmidge]

Been laying bricks again haven't you Al??

Sorry ;)

P :D

[Rusty]

If I may presume...quite obviously, if there is not enough volume, you won't be able to hear the concrete.

Doesn't that feel better, now?;)

[ozwinner]

Been laying bricks again haven't you Al??

Sorry ;)

P :D
I have.
I think Im addicted. :o
Pass me another brick man.....

Ohhh, thats soooo much better.

Al :D

[Daddles]

Oh gawd, I don't know who's sicker. You lot or me for joining in.

Richard

[Cliff Rogers]

Tall and tan and young and lovely, The girl from Ipanema goes walking, And when she passes
each one she passes goes "a-a-ah!"
When she walks she's like a samba that, Swings so cool and sways so gentle, That when she passes
each one she passes goes "a-a-ah!"
Oh, but I watch her so sadly, How can I tell her I love her? Yes, I would give my heart gladly
But each day when she walks to the sea, She looks straight ahead not at me
Tall and tan and young and lovely, The girl from Ipanema goes walking, And when she passes
I smile, but she doesn't see, She just doesn't see, No she doesn't see....
</PRE>
"a-a-ah!" :D

If you want the cords, they are here....
http://www.bossanovaguitar.com/antonio_carlos_jobim/chords_lyrics/the_girl_from_ipanema.html

[Iain]

:confused: :confused: :confused:
Smoking those funny cones again?
Sounds a bit like the green horse story.

[Fat Pat]

I feel blessed....my first NEW post and it has been high-jacked. I sort of guessed that pancakes would make an appearance though, but skimpy little bikinis on South American beaches weren't expected ;)

Keep it coming fellas, beats the alternatives of the political blogs I scan by miles!

Anyway, no-one felt the need to furnish info about waterproofing my concrete. Is "BondCrete" the go, or is there some other goop that will work?

Let me know, then highjack away.

[Cliff Rogers]

[QUOTE=Fat Pat]...Anyway, no-one felt the need to furnish info about waterproofing my concrete. Is "BondCrete" the go, or is there some other goop that will work?....QUOTE]

BondCrete is for making new concrete stick to old concrete as far as I know.
What do you want to waterproof it for? Is there water under the slab(?) that you a filling the hole in?
There are a multitude of goops that can be used as a moisture barrier.
If it's under some other sort of flooring, timber, lino, etc, you can use plastic sheeting.
If it is to be a bare concrete floor, there are some sealers that are meant for sealing masonary/tile floor so they don't stain & they will work too.
Then there is/are a variety of 2 pack products that will give you a hard, wear resistent coating. I don't have any names so I can't help you.

In another thread, Midge mentioned a specialy painted workshop(?) floor....
http://www.woodworkforums.ubeaut.com.au/showthread.php?p=123502

maybe he can help.

[bitingmidge]

Thanks Cliff,

I reckon if I hadn't been thinking of those girls, I might have picked up that Pat's question "how much volume to a bag" was code for " how do I make waterproof concrete?


Is "BondCrete" the go, or is there some other goop that will work?

Maybe and yes.

.....but do you want to make concrete waterproof, or do you want to make waterproof concrete??

What do you want to do with it??

Cheers,

P :D

[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?

[bitingmidge]

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


:D :D :D

[ozwinner]

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 :D

[craigb]

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.

[Cliff Rogers]

].... 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. :D


Back to my mushies now!!

P


:D :D :D
Wanta see if we can get this thread closed too?

Look out Al!!!!! (insert maniacal laugh here):D <!-- / message --><!-- sig -->

[Cliff Rogers]

Ok, now Im confused :confused:


Al :confused:
<!-- / message --><!-- sig -->
Read these 2 links, it will become clearer.... eventually.....:D
http://www.woodworkforums.ubeaut.co...ad.php?p=123968
http://www.woodworkforums.ubeaut.co...09&postcount=12 (http://www.woodworkforums.ubeaut.com.au/showpost.php?p=123909&postcount=12)

[Fat Pat]

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?

[Termite]

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.

[Fat Pat]

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

[bitingmidge]

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!!)

:D :D :D

[Daddles]

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. :D

Cheers
Richard

[Termite]

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.

[Fat Pat]

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!

[Iain]

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