Setting Time Test Of Cement
Setting time of the cement is tested in order to check its deterioration due to storage .
Setting time of the cement is further referred as initial setting time and final setting time .
Initial Setting Time Test
Initial setting time test is regarded as the time which is measured from the instant water is added into the cement upto the time it starts loosing its plasticity .For OPC initial setting time is approximately 30 minutes .
In order to perform this test 500 gm of cement is guaged with .85P (i.e. 85% of the water required to prepare the cement paste of standard consistency is used ) and the paste formed is filled in the mould .
Initial setting time is taken as the time in which square needle of size 1 mm penetrates into the mould upto depth of 33 to 35 mm from the top .
Final Setting Time Test
Final setting time is regarded as the time which is measured from the instant water is added into the cement upto the time it completely looses it's plasticity and attain sufficient firmness.
In order to find the final setting time mould is prepared same as above .
Final setting time is taken as the time in which needle at the centre of the annural collar is able to make the impression over the mould but annular collar fails to do so.
For opc final setting time is approximately 10 hours.
Setting time of the cement is further referred as initial setting time and final setting time .
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| source :CivilArc |
Initial Setting Time Test
Initial setting time test is regarded as the time which is measured from the instant water is added into the cement upto the time it starts loosing its plasticity .For OPC initial setting time is approximately 30 minutes .
In order to perform this test 500 gm of cement is guaged with .85P (i.e. 85% of the water required to prepare the cement paste of standard consistency is used ) and the paste formed is filled in the mould .
Initial setting time is taken as the time in which square needle of size 1 mm penetrates into the mould upto depth of 33 to 35 mm from the top .
Final Setting Time Test
Final setting time is regarded as the time which is measured from the instant water is added into the cement upto the time it completely looses it's plasticity and attain sufficient firmness.
In order to find the final setting time mould is prepared same as above .
Final setting time is taken as the time in which needle at the centre of the annural collar is able to make the impression over the mould but annular collar fails to do so.
For opc final setting time is approximately 10 hours.
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