DIFFERENCE BETWEEN OPC AND PPC CEMENT

 Difference between opc cement and ppc cement

OPC is ordinary portland cement ,where as ppc termed as portland pozzolona cement, in simple terms if we add pozzolona material into ordinary portland cement it is portland pozzolona cement 

Then what is pozzolona material ?

flyash from thermal powerplant, slag from steel plants , rice husk ash from rice industries etc were called pozzolona 

why pozzolona added to cement?

pozzolona materials added for different purpose and used according to project wise eg slag cement(slag ppc) used in specific areas where the soil has high sulphate content , in chennai elevated metro project (vannarapettai to wimco nagar) for piling works slag cement is used because of high sulphate content in soil. 

like wise in your building construction if the soil has high sulphate content using slag cement will be of good use 

why in market mostly ppc( flyash based cement )only we are getting?

Indian standards(IS) codes allows 35% replacement of  flyash in cement .The environmental factor and govt policy supports usage of flyash ,Due to above factors cement companies were producing mostly ppc(flyash based) cement

Advantages of ppc cement

* Low heat of hydration  means heat in cement will be less than opc
*Higher durability of concrete ,plastering ,brick work because of less voids
*workable concrete ,plaster due to fineness of pozzolona material 
*Better cohesion with aggregates 
*long term strength of ppc (after 90) days will be more than opc cement 
*environment friendly etc 

Disadvantages 

* Initial strength will be lesser than opc cement
* setting time will be more
*different type of ppc (slag,flyashbased ,rice husk etc) have different properties hence lay man can not use blindly.expert material/quality engineer  advice needed 

Note ;The cement brand is for image purpose only, not recommending any brand
V.SUDHAKAR BE,MBA,LLB,AMIE,FIV
CHARTERED AND PROFESSIONAL ENGINEER
QVR INFRA CONSTRUCTION (OPC) PVT LTD 
9444991031