×
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

Semi-low density Concrete

Semi-low density Concrete

Semi-low density Concrete

(OP)
An 18 m span post-tensioned beam in a 40 year old above grade open air parking garage requires repair due to soffit delamination caused by corrosion of bottom bars. The corrosion was caused by past leakage at an expansion joint which has been fixed several years ago. The original concrete was semi-low density at 115 pounds per cubic foot (pcf), according to the original drawings which we have. The added weight of the normal density repair concrete versus the semi-low density concrete is not an issue, since the weight of repair concrete is very small relative to the total load. We know that special care is required because of the un-bonded tendons.

Question:

Is there any significant compatibility issue with using normal density concrete at 145 pcf for the repair of the beam that has 115 pcf concrete?

RE: Semi-low density Concrete

I foresee no issues. The difference stems primarily from aggregate selection I believe. If it were normal weight concrete, we wouldn't go to any great lengths to match the aggregates.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

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