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!

*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.

Jobs

Cracking in Post tension slab

Cracking in Post tension slab

(OP)
I have project that has a longitudinal crack in the PT slab The crack runs along a single curved strand line near the longitudinal center of the rectungular slab (280'x100'). The crack is <1/16" wide and is not vertically offset. The crack runs the entire width of the slab and.

The slab is ~10" thick and contains regularly spaced strands which span the longintudinal direction (16k/ft) and curved bulk strands along the column lines in the transverse direction (~425 k) A drive lane and parking area are located above with no unusual loading near the crack line.

Any thoughts as to the source of the cracking? Is it better to repair with an elastic sealant or rigid epoxy?  

RE: Cracking in Post tension slab

1. We need more info, ie bonded/unbonded, restraint layout, type of slab, photo's, ect.

2. After you have established that the cracking is not structural and this is not a movement joint created by the slab, then I would recommend a  cementitious grout that closely matches your concrete used for the PT slab.
 

A clear conscience is usually the sign of a bad memory

RE: Cracking in Post tension slab

S22...the crack is too narrow to use anything cementitious.  It is most likely a shrinkage crack  that occurred prior to stressing the strands.

I would use a semi-rigid epoxy.  W.R. Meadows Company makes one...I'll see if I can get the specifics.

RE: Cracking in Post tension slab

Thanks fo the pick up ron, 1/16 of an inch did compute well in my head.  

A clear conscience is usually the sign of a bad memory

RE: Cracking in Post tension slab

S22--here's the material I was thinking of.  I've used it before in residential applications for interior slabs.


http://www.wrmeadows.com/wrm00055.htm

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close