INITIAL AND FINAL SETTING TIME TEST OF CEMENT

AIM:

To determine the initial and the final setting time of cement as per IS: 4031 (Part 5) – 1988.

APPARATUS:

Vicat Appratus
Fig:- vicat apparatus

i) Vicat apparatus conforming to IS: 5513 – 1976
ii) Balance, whose permissible variation at a load of 1000g should be +1.0g
iii) Gauging trowel conforming to IS: 10086 – 1982

PROCEDURE:

i) Prepare a cement paste by gauging the cement with 0.85 times the water required to give a paste of standard consistency (see Para 1.2).
ii) Start a stop-watch, the moment water is added to the cement.
iii) Fill the Vicat mould completely with the cement paste gauged as above, the mould resting on a non-porous plate and smooth off the surface of the paste making it level with the top of the mould. The cement block thus prepared in the mould is the test block.

A) INITIAL SETTING TIME

Place the test block under the rod bearing the needle. Lower the needle gently in order to make contact with the surface of the cement paste and release quickly, allowing it to penetrate the test block. Repeat the procedure till the needle fails to pierce the test block to a point 5.0 ± 0.5 mm measured from the bottom of the mould.
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.

B) FINAL SETTING TIME

Replace the above needle by the one with an annular attachment. The cement should be considered as finally set when, upon applying the needle gently to the surface of the test block, the needle makes an impression therein, while the attachment fails to do so.

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.

Observation Table:

REPORTING OF RESULTS:

The results of the initial and the final setting time should be reported to the nearest five minutes.

Limit : 

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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