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 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.
h
I recommend this book for general mix info, I have it at work:
http:/
RE: Sulfate Resistance Comparison of slag, silica fume, fly ash
RE: Sulfate Resistance Comparison of slag, silica fume, fly ash
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.