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No real data...just hunches. There was a paper a long time ago that stated that the 4x8 size generated higher breaks but that was probably due to the fact that the tested 4x8s and 6x12s equally during casting, i.e. they did both in 3 lifts, not 3 lifts for 6x12s and 2 lifts for 4x8s as is...

I agree with msucog. The smaller size samples are actually easier to protect and do not get "thrown" around. Also, it's interesting to note that the rationale behind the three 4x8s versus two 6x12s is not really based on any data. There are hunches and a lot of people have data on correlating...

Make sure you keep in mind what you are combining the GGBS with. As an example, cements in Canada and US are different in chemistry. US cements are low alkalis and Canadian cements are typically higher in alkalis. The net effect, higher alkali cements activate slag better than lower alkali...

An easy check for quick compatibility (disregarding the asr, shrinkage, pumpability issues, etc.), compare the aggregates relative densities (formerly specific gravities under ASTM) and the dry-rodded unit weight. If similar, some comfort can be given to the switch. Still would want to see the...

Delvo would be an excellent product for this situation (and no I don't work for deGussa). I would not recommend a normal retarder unless it is monitored like a hawk through production as cement chemistry does and will change thus influencing the effectiveness of a normal retarder, not to...

This is a common issue and to get to the root of it would require many man hours. There have been numerous good points made that I completely agree with but I'll take a stab at clarifying a few things. First, we need to incorporate some statistics here. Discussing a few points in space is...