Monitor 90 Micron Sieve in Cement

We are monitoring the cement fineness by 45 micron only but not by 90 micron. How important to monitor 90 micron residue in cement. Explain. Also in our clinker the MgO is around 4.3 %. We would like to produce OPC 43 grade cement , but it is failing in auto clave test. Is there any alternative available to produce OPC 43 grade with this much MgO in clinker.

 

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