Difference between initial setting time and final setting time

INITIAL SETTING TIME

The time period elapsing between the time, water is added to the cement and the time, the needle fails to pierce the test block by 5.0 ± 0.5 mm measured from the bottom of the mould, is the initial setting time.

The initial setting is the time when the chemical reaction between cement and water starts (paste starts losing its plasticity) and it should be not less than 30 minutes without an additive.

FINAL SETTING TIME

The period elapsing between the time, water is added to the cement and the time, the needle makes an impression on the surface of the test block, while the attachment fails to do so, is the final setting time.

The final setting is the time when the chemical reaction between cement and water is finished (The time at which cement completely loses its plasticity and became hard is a final setting time of cement)  and for Ordinary Portland Cement, The Final Setting Time is 600 min.

Type of cement
Initial setting time Min. (minutes)
Final setting time MAX.
(Minutes)
 
 
Ordinary Portland cement (OPC) 33 GRADE 30 600  
Ordinary Portland cement (OPC) 43 GRADE 30 600  
Ordinary Portland cement (OPC) 53 GRADE 30 600  
Portland Pozzolana Cement (PPC) 30 600  
Portland Slag Cement (PSC)  30 600  
Portland Slag Cement (PSC)  30 600  
Rapid Hardening Portland Cement (RHPC) 30 600  
High Alumina cement 30 600  
Low heat cement 60 600  
Masonry cement 90 1440  

Watch the video given in the link below, for better understanding and detailed explanation

Difference between Initial Setting Time & Final Setting Time

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