×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Pad recommendations.
5

Pad recommendations.

Pad recommendations.

(OP)
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

RE: Pad recommendations.

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.

RE: Pad recommendations.

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

RE: Pad recommendations.

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

Richard A. Cornelius, P.E.
WWW.amlinereast.com

RE: Pad recommendations.

(OP)
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

RE: Pad recommendations.

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.

RE: Pad recommendations.

(OP)
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

RE: Pad recommendations.

"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.

RE: Pad recommendations.

(OP)
Yes that's the correct conversion. (ouch)

That's excellent news.  Thanks!

Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com

RE: Pad recommendations.

I would suggest self levelling grout to get a level surface

RE: Pad recommendations.

(OP)
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

RE: Pad recommendations.

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.

RE: Pad recommendations.

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

Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources