×
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

Void around the center bar of an Auger Cast Grout pile

Void around the center bar of an Auger Cast Grout pile

Void around the center bar of an Auger Cast Grout pile

(OP)
We have done 24" Auger Cast Grout piles. The piles have a center bar and a cage bar. The piles were over poured by 3 feet (as designed). During chipping the extra 3-feet we found a void around the center bar at the bottom of the extra grout.

The contractor said this is typical. They claimed that the center bar draws water which causes the void.

Has anyone seen this before? and is it really that common?

RE: Void around the center bar of an Auger Cast Grout pile

Not seen, but I surmise while inserting it that it dragged grout along with it and of course that grout had to come from some place.

RE: Void around the center bar of an Auger Cast Grout pile

If the void is caused by bleed water rising through the concrete then it means that you need to modify your mix design.

RE: Void around the center bar of an Auger Cast Grout pile

Sounds to me like the grout had started to cure before the center bar was inserted.

Mike Lambert

RE: Void around the center bar of an Auger Cast Grout pile

(OP)
Very interesting. One more idea from a coworker, the center bar had dirt on it.

The contractor proposed plan is to clear around the center bar going deep until the grout is well placed around the bar, then fill the void with some sika product. They are very confident that this is limited.

At this point, there is no way to verify that this condition is not repeated. For small voids, I have no doubt the pier will perform. The problem is there is no way to verify (other than testing it, which could not be done.)

Any recommendations?

RE: Void around the center bar of an Auger Cast Grout pile

Retrograde is correct. The mix most likely needs special admixtures.
Check out Specrete or common VMAs available from BASF, Euclid...

RE: Void around the center bar of an Auger Cast Grout pile

Steel does not "draw" water. The void is either a void from lack of consolidation or from bleed water. The size of the void, its orientation and its surface characteristics will tell the source of the issue.

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! Already a Member? Login


Resources

White Paper - Considerations for choosing a 3D printing technology
The adoption of 3D printing into major companies’ product development life cycles is a testament to the technology’s incredible benefits to consumers, designers, engineers and manufacturers. While traditional production methods have limitations in manufacturability, 3D printing provides unparalleled design freedom due to the additive method of building parts layer by layer. Download Now

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