×
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

Slump of Pump Mix Concrete!

Slump of Pump Mix Concrete!

Slump of Pump Mix Concrete!

(OP)
Where can I find the allowable slump for pump mix concrete using high range water reducer? We have specified a slump of 4"+/-1" at normal condition - 4000 psi and 5000 psi concrete (cast in place parking garage). Concrete mix design indicates 8" of slump. I would appreciate help.

RE: Slump of Pump Mix Concrete!

The slump of the concrete is contractor's item which depends on the site requirements and method of placement. When contractor need higher slump then specified they request the supplier to use superplastisizer to increase slump. Supplier maintain the slump prior to addition of superplasisizer.

RE: Slump of Pump Mix Concrete!

Using a high range water reducer (and ideally, a viscosity modifier to keep aggregate in suspension), you may end up with anywhere from 8" to something which is too fluid to be measured by slump testing. Since slump is simply a QA measure for water-cement ratio and workability, once the WRA is added, you can't really test for these.

Your admix supplier and ready mix supplier/designer should be able to provide advice.  On small jobs, you may be able to add the admixtures after checking an initial slump (depending on admix).  On large jobs, the supplier should provide test data on the mix design as part of submittals.

RE: Slump of Pump Mix Concrete!

(OP)
Thanks both of you.

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