Final setting time of cement Test

Final setting time 

 Aim :-  

To determine the final setting time of cement .

Objective :-

It is the time at which cement starts hardening and completely loses its plasticity is known as final setting time.

Apparatus:- 

1. Balance :-The permissible variation at a load of 1000 g shall be ± 1.0 g.
2. Vicat Apparatus – Vicat apparatus should confirm to IS : 5513-1976.
3. Stop Watch
4. Gauging or Mixing Trowel
5. Glass Plate
6.  Enamel tray
7. Needle for Final setting time
8. mould

References :-

As Per  IS: 4031 (Part 5) – 1988.  The initial and final setting time of cement is calculated using the VICAT apparatus conforming to IS: 5513 – 1976.

Procedure :-

• Procedure for preparation of cement paste

1. Consistency of cement shall be tested before conducting a test to find out % of the water required by the weight of cement as normal consistency of cement (P).
2. Take about 400 gm of cement and add water about 0.85x P (P is % water required for normal consistency of cement)
3. Mix water with cement quickly in a short time about 3 min to 5 min. Start the stopwatch at the instance when water added to the cement. Record this time (T1).
4. Now, fill this prepared cement paste in Vicat apparatus mould having a diameter of 80 mm and a height of 50 mm resting on non –porous glass plate. Properly fill and smooth off the top surface of mould and level it.

• Procedure of final Setting Time of Cement

1. For finding the final setting time of cement, replace the needle or plunder with the annular attachment and conduct the experiment.
2. The cement is finally set when the needle is applied gently on the mold and makes an impression but attachment fails to do so, note the time as T3.

Conclusion:-

when the needle fail to make impression  then recorded  time is called final setting time .