Pad recommendations. 5

[itsmoked]

I have a small pad 6ft by 2ft of solid, as in stable, brick work rising from a concrete pad, about 3ft tall. The top surface is not level with various high and low areas measured in about an inch.

There are surrounding wood sill-plates surrounding the area of discussion.

I would like to level the 6ftx2ft area with concrete. It can only be about 1 to 1-1/2" thick. It will ultimately be required to support 3,000 pounds sitting on a stand with four legs.

Will this be too thin a layer of concrete?

Any suggestions or recommendations?

Alternative solutions?

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[concretemasonry]

Too thin for good construction.

Usually 4" would be a better thickness, depending on the loacation of the support legs relative to the outside dimensions.

 

[cvg]

I think you are talking about placing a grout leveling pad and 1 inch thick would be ok.

 

[dicksewerrat]

Maybe shorten the legs and add concrete to make the 4 inches?

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[itsmoked]

Thank you for the swift responses.

Here's a picture to help the discussion.
The hammer is for scale.

http://www.box.net/shared/static/v79r3gfj5u.JPG

Notice the back trench and the right rear corner. About half an inch uneven. The four legs will have to be in the four corners and will be subject to these deformities.

If I go for 4 inches I will be up the drywall - a poor situation.

Maybe a polyester filled concrete?
Epoxy? Ouch $$$

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[Zambo]

The work looks good, if simple. Not sure what will happen to the wood cill plates in future, depends if any dampness expected.

For your one and a half tonne weight (am I correct? not sure about pounds) assuming you have decent size baseplates I would just put some chicken mesh down and then use a 3:1 sand/cement screed.

 

[itsmoked]

Thanks Zambo. That was what I was hoping to do.

Yes one and one half tons.

The feet will have plates to spread the weight a little but we're still talking 200lbs/in²

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[Zambo]

"but we're still talking 200lbs/in2" hmm...

Am I correct I get about 1.4N/mm2? You should easily achieve 15N/mm2 with your screed.

 

[itsmoked]

Yes that's the correct conversion. (ouch)

That's excellent news. Thanks!

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[csd72]

I would suggest self levelling grout to get a level surface

 

[itsmoked]

Say more.. Never heard of it. Where do I get it? Just in time I might add. LOL

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[csd72]

http://www.foxind.com/product.asp?sheet=22

http://www.devcon.com/devconfamilyproduct.cfm?familyid=133

http://www.loctite.com/int_henkel/loctite_mx/binarydata/pdf/LT3355v4_MROflooringgrout.pdf

There are lots of them around.

Basically they are a very runny grout that self levels under gravity. You will need to provide a timber box around it to stop it flowing out.

Any of these above grouts should be fine for loads up to about a ton, above that, check with the manufacturer.

 

[itsmoked]

Thanks csd72; and thanks for the links! I'll check it out.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com