×
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

Sulfate Resistance Comparison of slag, silica fume, fly ash

Sulfate Resistance Comparison of slag, silica fume, fly ash

Sulfate Resistance Comparison of slag, silica fume, fly ash

(OP)
Does anybody know how cement with Class F flyash, Slag, and Silica Fume compare in sulfate resistance? Does anybody have links to such comparisons?

RE: Sulfate Resistance Comparison of slag, silica fume, fly ash

I quickly checked a PCA reference I have:

I got the following from a chart of scm additions  considered to give high resistance (under ASTM 1012-95 expansion criteria at 6 months or 1 year) to sulfate attack. Listed from higher resistance to lower using Type 1 cement and with the given percentage of scm, (but all considered high resistance).

1. 20% Class F Fly Ash
2. 35% Slag
3. 6% Silica Fume
4. 15% Metakaolin

Other suggestions were to use type 2(moderate) or 5(high resistance) cement, and lower the w/cm ratio.  Don't use high calcium fly ash for sulfate resistance. Search around on PCA's site for more in depth information on sulfate resistance.

http://www.cement.org/tech/cct_durability.asp#links

I recommend this book for general mix info, I have it at work:
http://www.cement.org/bookstore/profile.asp?store=&pagenum=1&pos=2&catID=&id=155

RE: Sulfate Resistance Comparison of slag, silica fume, fly ash

I use 50% slag cement and type II cement.  We can't get quality fly ash in PA.  Look in ACI 318 or 350 Chapter 4.  They give guidelines.  Also look in ACI 350.  Silica Fume is good but unnecessary if you use 50% slag cement.

RE: Sulfate Resistance Comparison of slag, silica fume, fly ash

If you have project in mind, check out the ready-mix producers to see who has the experience and what materials are readily available and able to be used properly.

Nothing is worse than specifying a mix type and find out the local producer does not have the facilities (extra silos, batching controls, etc.) and knowledge to reliably produce what is specified.

If you are in a major market, you should have little trouble because of the vertical integration of the cement industry and increased interest in performance and technical support.

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