Judging the quality of clinker

Various methods of judging the quality of cement clinker are available. As a rule, several are applied. 

Ono s theory, on which the "Ono Method" is based, succinctly set forth in 1981 by Ono (pp. 200-204) and restated in 1995, appears to have a wide and growing acceptance, judging by the numerous research reports by Asian and South American micros-copists and the increasing use of the method in North America. Whether called the "Ono Method" or not, the principal variables in clinker quality control are maximum temperature, time at high temperature, rates of heating and cooling, and the nature of the raw feed. 

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