dear,

what Ted told is absolutely write . I have faced the same problem with low AR and with slightly increase in MgO in Clinker.

Hi Ted

Your suggestion is absolutely useful. I will try and see what happen. So thanks for your help.

With best regards

phanminh

I think break down such a big  boulder  that would see that inside will be very difficult. Probably in order to break down the  boulder, it is necessary to climb a very high building, for example - Empire State Building and throw it down. Such work can made only the Mighty Mouse.

Hi 

Here is chemical composition of the boulder, what do you think about this? might be it made from the midle ring, right?