INITIAL AND FINAL SETTING TIME OF CEMENT

INITIAL AND FINAL SETTING TIME

Initial setting time

Cement → 200g - 300g

Stop clock --->water→ 85% by wt. of cement

Normal consistency of cement paste = 0.85P

A cement paste is prepared by mixing of water 0.85 times of cement which has 

consistency 0.85P.

 Stop clock is started with mixing of water & when the penetration of square needle remains 30-35mm from top level, stop the clock at this penetration & consider the time, known as Initial setting Time of Cement.

NOTE:

Initial setting time for various types of cement are given below 👇👇👇

 O.P.C. → 30mm

Quick setting Cement → 5 min

Low Heat cement → ≮ 1 hours

Final Setting Time

Attachment is replaced with annular callar (dia-5mm) with same cement mould. Continue the stop clock & pinch up by annular collar with gap duration. When the annular collar penetration is only up to 0.50mm, note down that time considered as Final setting time of cement.

NOTE:

Final setting time of various types of cement are given below 👇👇👇

OPC → 10h

Quick setting cement → 30min

Low Heat Cement → 10h