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ASR Mitigation in Concrete
2

ASR Mitigation in Concrete

ASR Mitigation in Concrete

(OP)
Hello,

I am currently a field engineer and we are pouring foundations in which the the supplier is using 20% class f fly ash to mitigate ASR. THe back up plan is to use lithium nitrate. Currenly their mix will use 542 lbs cement and 141 lbs class f fly ash. In the case of the back up plan, do they use 542 lbs cement, 141 lbs class c fly ash and lithium nitrate? THe back up plant is unable to hold class f so that is the reason behind lithium nitrate. Our specs state that class f or lithium nitrate must be used to mitigate asr

RE: ASR Mitigation in Concrete

Yes, the lithium nitrate can be used in conjunction with fly ash.

Your portland cement percentage is still a bit high to mitigate ASR.  You might consider using ground granulated blast furnace slag cement (GGBFS).  While you will get a retarded strength gain (as you will with fly ash also), it will help quite a bit with the ASR issue.
 

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