Initial setting time of cement
The period 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 mold, is the initial setting time.
The initial setting is the time when the chemical reaction between
cement and water begins (the paste begins to lose its plasticity) and should
not be less than 30 minutes without additives.
Final setting time of cement
The period 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 the chemical reaction between cement and water ends (the
time at which the cement completely loses its plasticity and hardens is the
final setting time of cement) and for ordinary Portland cement, the final setting time is 600 minutes or 10 hours.
Initial and final setting time of various types of cements are given as :-
Differences between:
Whole Circle Bearing vs Quadrantal Bearing
Lintel level vs Sill level vs Plinth level
Construction Joint vsExpansion Joint
Site Engineer vs SiteSupervisor
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