CEMENT TEST INITIAL AND FINAL SETTING TIME

CEMENT TEST  INITIAL AND FINAL SETTING TIME

AIM

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

APPARATUS

                               VICAT APPARATUS

i) Vic-at 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

1) Prepare a cement paste by gauging the cement with 0.85 times  the  water  required  to  give  a  paste  of  standard consistency

2) Start a  stop-watch,  the  moment  water  is  added  to  the cement.

3)   Fill  the  Vicat  mould  completely  with  the  cement  paste gauged as above,

4)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.

5) The cement block thus prepared in the mould is the test block.

 

A) INITIAL SETTING TIME

1) Place the test block under the rod bearing the needle.

2) Lower the needle gently in order to make contact with the surface of the cement paste and release quickly

3) Allowing it to penetrate the test block.

4) Repeat the procedure till the needle fails to pierce the test block to a point 5.0 ± 0.5mm measured from the bottom of the mould.

5) The time period elapsing between the time

6) Water is added to the cement and the time,

7) The needle fails to pierce the test block by 5.0 ± 0.5mm measured from the bottom of the mould, is the initial setting time.

 

B) FINAL SETTING TIME

1) Replace  the  above  needle  by  the  one  with  an  annular attachment

2) The cement should be considered as finally set when, upon applying the needle gently to the surface of the test block,

3) The   needle   makes   an   impression   therein, while   the attachment fails to do so.

4) The period elapsing between the time, water is added to the cement and the time,

5) The needle makes an impression on the surface of the test block

6) While the attachment fails to do so, is the final setting time.

 

REPORTING OF RESULTS

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

 

 

 

CEMENT PASTE OF STANDARD CONSISTENCY TEST

TYPES OF SOIL TESTS IN CONSTRUCTION