×
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

Set Retarding Admixture - Cons?

Set Retarding Admixture - Cons?

Set Retarding Admixture - Cons?

(OP)
Living in the south, set retarding admixtures are frequently proposed in mix designs. Moving into the fall/winter, I have some projects where I don't think a retarding admixture will be needed (due to temperature). I don't know much about the negatives of using retarding admixtures.

The PCA Design and Control of Concrete Mixtures recommends only using retarding admixtures in "extreme cases". That makes me believe that there are some negative aspects and we should not allow them unless they are absolutely necessary. Input regarding the cons of using retarding admixtures is appreciated!

RE: Set Retarding Admixture - Cons?

I'm in Arizona, so it's pretty hot here, too. And we don't get that proposed (set retarding mixtures) very often, so I don't know what their motivation is in your neck of the woods. But I don't like any admixtures beyond our standard (water reducing, air entraining, maybe a super p for good measure) setup.
It's like medications. Maybe you can mix viagra and ambien, but maybe it turns into something horrible. I don't want to find out.

RE: Set Retarding Admixture - Cons?

JedC:
You mean it gets as hard as concrete after 7 and 28 days??? I think you are mixing metaphors here, not concrete. I thought Viagra had a 4 hour time limit of some sort. And then, I think the retarder idea (additive) has to do with another aspect of this other process, and they don’t call that premature set-up either. This damn engineering and construction business is gettin confuseder by the minute. I think I’ll go home and see if my girlfriend wants to mix some cement. smile

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