×
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

Broken Concrete Footing Can Being Repaired?

Broken Concrete Footing Can Being Repaired?

Broken Concrete Footing Can Being Repaired?

(OP)
Proposed 4-story Building is supported by isolated footing rest on Bored Piles. A newly concrete footing was found to be inadequate due to  low strength test results, so the consultant decided to remove the concrete. However, our project manager refused to do so, instead, he proposes to remove only portion of the concrete that seems weak which is located 1/3 of the thickness upper part of footing to keep lower part remain. Then using special cementious material and adhesive chemical and fill up concrete up to the required level. My question is, Does it satisfy to rectify the structural integrity of the footing? Please, any expert on this to give your opinion is highly appreciated.Thanks a lot.

RE: Broken Concrete Footing Can Being Repaired?

What the project manager is proposing is possible, but would require some additional design considerations, including doweling of the existing concrete to tie to the new concrete.

Unless this is an exceptionally large footing, I would recommend against this approach.  You will only have one opportunity to fix the problem...don't shortcut the process.

RE: Broken Concrete Footing Can Being Repaired?

(OP)
Ron,
   Thanks a lot..But one more thing to clarify. The shape of footing is triangle with equal three sides having dimensions of 3.2 m. Upper portion appears to be weak which is about 1/3 of thickness of 1.15 m. Our project manager wants to break the upper part only and rectify the concrete using cementious material and adhesive chemical for bonding between the old and new concrete. To me, once you break a concrete especially footing using jack hammer, that will harmful to structural integrity of the structure. Do you have different opinion on this? Please reply.

RE: Broken Concrete Footing Can Being Repaired?

allanex50...you are correct.  Utilizing a jackhammer to remove partial depth in concrete can and does introduce microcracking in the underlying concrete.  Sometimes it "repairs" itself (autogenous healing from unhydrated cement particles); however, the potential damage is done.

You might allow it if the contractor does a full scale load test to twice the design load after the repairs are complete.

RE: Broken Concrete Footing Can Being Repaired?

Agree with Ron.  This approach is foolish.  Just pull it out and start over.

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