STANDARD
- IS:4031 (Part5) 1988.
OBJECTIVE
- To determine the initial and final setting times of cement.
APPARATUS
- Vicat apparatus conforming to IS: 5513-1976.
- Balance of capacity 1kg and sensitivity 1 grant.
- Gauging trowel conforming to IS: 10086-1982.
PROCEDURE
- Unless otherwise specified this test shall be conducted at a temperature of 27 ± 2°C and 65 ± 5% of relative humidity of the Laboratory.Prepare a paste of 300 grams of cement with 0.85 times the water required to a give a paste of standard consistency IS: 4031 (Part 4)1988.
- The time of gauging in any case shall not be less than 3 minutes not more than 5 minutes and the gauging shall be completed before any sign of setting occurs.
- Count the time of gauging from the time of adding water to the dry cement until commencing to fill the mould.
- Fill the vicat mould with this paste making it level with the top of the mould.
- Slightly shake the mould to expel the aft.
- Immediately place the test block with the non-porous resting plate, under the rod bearing the initial setting needle.
- Lower the needle and quickly release allowing it to penetrate in to the mould.
- In the beginning the needle will completely pierce the mould.
- Repeat this procedure until the needle fails to pierce the mould for 5 ± 0.5mm from the bottom.
- Record the period elapsed between the time of adding water to the cement to the time when needle fails to pierce the mould by 5 ± 0.5mm as the initial setting time.
Final Setting Time
- Replace the needle of the vicat apparatus by the needle with an annular ring.
- Lower the needle and quickly release.
- Repeat the process until the annular ring makes an impression on the mould.
- Record the period elapsed between the time of adding water to the cement to the time when the annular ring fails to make the impression on the mould as the final setting time.
REPORT
- Report the initial setting time and final setting time in minutes.
PRECAUTION
- The time of gauging in any case shall not be less than 3 minutes not more than 5 minutes.
DETERMINATION OF INITIAL AND FINAl. SETTING TIME
IS: 4031 ( Part 5 ) 1988
| Description | Units | Test I | Test 2 | Average |
| Actual test temperature | C | |||
| Weight of cement(W) | gms | |||
| Consistency(P) | % | |||
| Quantity of water to be added (0.85xPx300)/l 00 | ml | |||
| Time of adding water to cement | Hours | |||
| Time at initial setting | Hours | |||
| Total time taken for initial setting | minutes | . | ||
| Time at final setting | Hours | |||
| Total time taken for final setting | minutes | |||
| Initial Setting Time . 30 minutes (Minimtim) Specified Limit: Final Setting Time – 600 minutes (Maximum) |
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| Remarks: | ||||
DETERMINATION OF INITIAL AND FINAl. SETTING TIMES
IS: 403I ( Part 5 ) 1988
Brand of Cement : Date of sampling :
Grade of Cement : Date of testing :
Batch No :
| Description | Units | Test I | Test 2 | Average |
| Actual test temperature | C | |||
| Weight of cement(W) | gms | |||
| Consistency(P) | % | |||
| Quantity of water to be added (0.85xPx300)/l 00 | ml | |||
| Time of adding water to cement | Hours | |||
| Time at initial setting | Hours | |||
| Total time taken for initial setting | minutes | . | ||
| Time at final setting | Hours | |||
| Total time taken for final setting | minutes | |||
| Initial Setting Time . 30 minutes (Minimtim) Specified Limit: Final Setting Time – 600 minutes (Maximum) |
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| Remarks: | ||||