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 time when chemical reaction between cement and water is start (paste starts losing it’s plasticity) and it should be not less than 30 minutes without 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.

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 Min.
(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
Masonary cement 90 1440

 

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