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.
If you have a query, you can ask a question here.
sir
i m student of structure. this material is too much helpfull to me specially in the course of concrete technology,
plz explain for me that what is air set in cement and what are their disadvantages
i want to know that what is the effect on setting of cement if we add fly ass in concrete
sir as i have knowledge about fly ash so it is cemetious material so it is used to reduce the precetage of cement and it have very good strength about real cement but real cement also added in it ?amjad barohi
A INITIAL SETTING TIME OF 2 HR IS IT OK. AND FINAL SETTING TIME OF 3HRS.
dear Bolaji;
This depend on the properties of the cement under subject. OPC of 45 min as minimum and max of 10 hours of final could be acceptable.
initial setting time should not more than 30-40 min for ordinary portland cement,and final setting time is aprox 600 min
i would really like to know in details the importance of carrying out the tests for consistency of cement,initial and final setting time of ordinary portland cement(o.d.c.) before using the cement.if the cement does not meet up with standard by a small margin,can the cement be used for any other purpose,specify if so.
Daer Sir;
I think you need to confirm IS requirements with EN 196-3 as the initial setting penetration is somewhat little different from what you published.
Thanks
Dear Sir,
What is the relation between setting time and grade of cement?. How the setting time varies with different grade of cement?
Thanks in advance.
can u send me the different test conducted on cements and concrete and their permissible limits of the tests conducted
what is the initial and final setting time of nanocement?
Dear Sir, How to calculate IST for concrete. Actually as per IS 8142-1976 penetration resistance of 3.43 N/mm2 for 25 mm(I’m using 2 needle one for IST & another for FST. How to convert that needle to N/mm2 25 mm depth plz explain)
Dear sir, I find a real and solid defination of final setting time. so plz give me some defination of final setting time
i want bulk density theory
can you send me, what are the test conducted for concrete? please
final setting time for opc 540min
what is standard consistency of cement paste ?
Initial setting time of ordinary portland cement 30 min, and final setting time is 600 min.(10 hr).
The Standard Cement Consistency of cement in Between 25% to 30% because in SP -23 they have given in Most of test W/C ratio is 0.37 to 0.42
what is the importance of initial setting time and final setting time ??
how is the rate os setting of portland cement controlled in manufacturing process?
how is the standard consistency expressed ?
can any one help me plz for ansar
amal it is expressed in ml
sir what is the difference between OPC and PPC?
initial setting time of ordinary portland cement 30 min, and final setting time is 600 min.(10 hr). ok
Initial setting time is very importent, some time requared for hardning of concretebecause, other wise very difficult to transfer the concrete one place to other,its sets immidiatly. so west the concrete
if i mix admixture as a compound(pudlo) with concrete then easily transfer concrete one place to another place.