To determine initial setting time

-Steps:

1. A cement paste of standard consistency is prepared using water content determined earlier
2. A needle of 1mm2 cross sectional area is fixed to appratus and released
3. Check penetration
4. When needle penetrate to 5mm from bottom , initial set have taken place
5. Initial set is the time elaspsed since water has added to cement
6. Minimum of 45 minutes for OPC