×
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 & Concrete Placement Times

Grout & Concrete Placement Times

Grout & Concrete Placement Times

(OP)
I have a situation where a contractor placed cementious grout after the 90-minute bath to placement time. I, as the EOR, was not aware of this until a list was provided from 4 months prior. The 28-strength sample was taken after placement, and had 5460psi.

The final strength is more than I need or specified. What other problems should I be concerned about that may require additional investigation.
-Would inadequate consolidation be an issue?
-Uneven curing?
-Anything?

Thanks!

RE: Grout & Concrete Placement Times

(OP)
The title for concrete was because it made me curious for that as well and there is probably more information on that topic. (?)

RE: Grout & Concrete Placement Times

What is the application for the cementitious grout - block filling, baseplate bearing, wall panel ?

RE: Grout & Concrete Placement Times

(OP)
The grout was used to reinforce existing hollow CMU. The wall will be supporting decent point loads from columns above as well as some bearing walls for a two-story commercial space. So block filling in this application, but the question is more of a general for future considerations.

RE: Grout & Concrete Placement Times

EE...keep in mind that the compressive strength testing done from samples taken in the field is to check the mix design, not the in-place concrete. The connection is by inference only, assuming reasonable placement, consolidation and curing methods were employed. If not, the lab strength and the field strength might not be close together.

The most common problem with cell fill is consolidation. Have the contractor check to see that the cells are properly filled using a variety of non-destructive methods....(infrared thermography, GPR, sounding, etc)

RE: Grout & Concrete Placement Times

Was the slump measured when the compressive strength samples were taken after grouting the wall? There is no time limit for transit mixed grout provided the slump requirements are met. See ACI 530.1-08 article 3.5A.

RE: Grout & Concrete Placement Times

As Ron indicated, it's my experience that the insitu strength (not field cured) can be twice the lab strength with infilled CMU's. Placing slump would be more critical.

Dik

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