×
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

Slag set time in cold weather

Slag set time in cold weather

Slag set time in cold weather

(OP)
Can someone tell me how much slag affects the set time of concrete?

I asked for 15%-25% slag replacement because Type II cement is not readily available in the area. This is for a digester tank containing wastewater. But the concrete supplier does not want to use slag because it is harder to obtain than flyash and he said the outside temperature is 33degrees F.

How does slag compare with flyash in terms of set time?

RE: Slag set time in cold weather

No question about the retarding effects or slow strength gain when you are using fly ash and slag. The cool weather temperatures magnify the effects, no matter what the concrete temperature at placement.

Even though you may get a 28 day cylinder strengths specified, the actual site concrete at that time may be substantially lower because testing lab cylinder curing is not meant to be representative of the site curing. It just can take lower to cure and obtain the desired properties.

Slag could be a little difficult to get in some areas because it is really a waste product that has found a performance home, but not an economic niche in all areas.

RE: Slag set time in cold weather

(OP)
but how does cure time compare between slag and fly ash?

RE: Slag set time in cold weather

look at ciria report 93 and 660 I believe on formwork striking times and thermal cracking. this is very useful in looking at water retaning structures. setting time for replacement mix is increased not sure without referencing reports difference between fly and slag though there is a diff.

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