Test To Check Initial And Final Setting Time Of Cement
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INITIAL AND FINAL SETTING TIME
We need to calculate the initial and final setting time as per IS: 4031 (Part 5) – 1988. To do so we need Vicat apparatus conforming to IS: 5513 – 1976, Balance, whose permissible variation at a load of 1000g should be +1.0g, Gauging trowel conforming to IS: 10086 – 1982.
Procedure to determine initial and final setting time of cement
i) Prepare a cement paste by gauging the cement with 0.85 times the water required to give a paste of standard consistency.
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 ± 0.5mm 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 ± 0.5mm 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.
I self varun bhardwaj fron mmmec gorakhpur. I WANT TO CHECK CIEMENT BY TESTING BECAUSE THIS IS MY PROJECT IN CIEMENT
initial time is 30 minutes and final setting time is 600 minutes….
answer me following,,,
1) Importance of the test. with reference to chemical composition of cement and its hydrolysis properties?
2) normal results expected?
3)use of retarders?
4) use of additives to change setting time and its importance?
5) results of deviation of actual results from expected results?
At what time does initial or final setting time start and end?and how do you give the results to students?
why need of this test
my project on the high volume fly ash mortar so we need to check cement. we are using ppc cement but the intial and final setting time of ppc cement different from opc cement.could it possible.
I am also planning to do a project on high volume flash .pls help me
Well i need help for structural analysis??
Sir,I am engineer.But i want to know difference between “port land cement and ordinary port land cement”also which are better cement for High rise building?
Sir, i m doing job in SGS INDIA PVT. LTD. as an inspection engineering. So i want to know that hw can i check the cement concrete ratio on site. Pls tell me the process of checking c/c ratio.
what is the errors these practicals
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