If we use PPC cement for slab what is the problem?

You would like to use the PPC cement for the RCC slab?

Certainly you can go ahead.

No issues at all with the slab strength .

Only one issue which you need to bear in the mind is that the setting process of PPC is usually slower than the OPC.

This means that the rate of gaining strength is lowered in case of PPC.

This translates to one important change on site as compared to the OPC :

Removal of the formwork shall have to be delayed by at least 50% of the time period permitted for OPC.

If you remove the centering of the slab after 7 days in OPC, this shall have to be done after 10 days .

Similarly please go through the striking off schedule for the slab, beams for different spans and revise this accordingly.

One positive aspect of using PPC for slab is that the micro cracks which you see on the fresh poured slab with OPC 53, can be avoided.

Hope you got the basic concept.