×
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

Grout to Rock Bond Strength
2

Grout to Rock Bond Strength

Grout to Rock Bond Strength

(OP)
I am working on the foundation reinforcement design that currently has a few rock anchors holding it in place, we need to add more micropiles (3" dia. DYWIDAG 150ksi  bar). The original foundation drawing is pretty vague and does not have specs shown for the anchor rocks or the grout used, However the geo specifies working bond strength between rock-grout interface as 62psi. Do you think it is ok to assume the same bond strength for the proposed DYWIDAGs or it can be something higher? Does the bond depend on the type of the grout or rather the type and quality of the rock?
Thanks.

RE: Grout to Rock Bond Strength

see FHWA-SA-97-070 Micropiles.  Table 5-2

RE: Grout to Rock Bond Strength

Bond almost entirely depends on the rock, as opposed to the grout.  Grout should be specified at f'c > 3000psi.  This should prevent any failures due to the grout.

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