×
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

Cylinders or cubes

Cylinders or cubes

Cylinders or cubes

(OP)
I've a feeling this will fall into the "studid" question category but ....

I'm an owner's rep watching a small construction project.  Reinforced CMU with concrete tie beams at the top of the walls.  Footing and slab-on-grade concrete was tested with 4 X 8 cylinders; fill cell grout with cubes.

The tec made cubes of the pea-rock concrete used for the tie-beams.  When I asked the tech about it he said they "always make cubes for pea-rock concrete".

I'm thinking it's concrete so it should have cylinders for testing.  When should cylinders be used and when should cubes be used?  

Thanks

 

RE: Cylinders or cubes

Were the beams formed or were they filling conventional CMN bondbeams/lintels?

Grout is alawys used to fill CMUs and the "cubes" should be formed with CMUs to allow the excess water to be absorbed since the specified slump is in the range of 8" - 11", as compared to the much lower slump specified for concrete. Since grout strength is not critical, is more important for it to be at or slightly above the strength of the CMU. The purpose of the grout is to tranfer the loads between the steel and the masonry units.

Grout in non-abdorptive molds give very misleading results.

If the "tie beam" is really a masonry bond beam the strength is not as critical as complete filling and bond, the grout would be more appropriate.

Dick

RE: Cylinders or cubes

(OP)
They are formed tie beams - 8 X 16 mostly - with top and bottom bars and stirrups; some are 8 X 32 beams (no cmu below)

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