Raj Sahu
198 posts
TimePosted 29/07/2009 06:56:32
Raj Sahu says

Setting Time

Dear Dr.Clarke,

In  a white cement setting time and flouride content are coming as given below,

Sample-1, IST = 100 minutes, FST = 160 minutes, Flouride = 0.22% ,Blaine= 416 m2/kg , SO3=3.07%

Sample-2, IST = 50 minutes, FST = 105 minutes, Flouride = 0.35%, Blaine =411 m2/kg , SO3 = 3.43%


It is very difficult to understand that in spite of increasing flouride content in sample No-2, setting time is coming around 50 minutes lower than the sample number-1.Could you please explain the possible reasons of lower setting time in cement No.-2 in comparison to sample No-1?


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Michael Clark
312 posts
TimePosted 29/07/2009 09:53:17

Re: Setting Time

Yes, it is difficult to understand in terms of the fluoride content alone. Also the surface areas are similar. It is possible that sample 2 is over-sulphated. Could this be a false set rather than a true set?