FINENESS
So we need to determine the fineness of cement by dry sieving as per IS: 4031 (Part 1) – 1996.The principle of this is that we determine the proportion of cement whose grain size is larger then specified mesh size.
The apparatus used are 90µm IS Sieve, Balance capable of weighing 10g to the nearest 10mg, A nylon or pure bristle brush, preferably with 25 to 40mm, bristle, for cleaning the sieve.
Sieve shown in pic below is not the actual 90µm seive.Its just for reference.
Procedure to determine fineness of cement
i) Weigh approximately 10g of cement to the nearest 0.01g and place it on the sieve.
ii) Agitate the sieve by swirling, planetary and linear movements, until no more fine material passes through it.
iii) Weigh the residue and express its mass as a percentage R1,of the quantity first placed on the sieve to the nearest 0.1 percent.
iv) Gently brush all the fine material off the base of the sieve.
v) Repeat the whole procedure using a fresh 10g sample to obtain R2. Then calculate R as the mean of R1 and R2 as a percentage, expressed to the nearest 0.1 percent. When the results differ by more than 1 percent absolute, carry out a third sieving and calculate the mean of the three values.
Reporting of Results
Report the value of R, to the nearest 0.1 percent, as the residue on the 90µm sieve.
If you have a query, you can ask a question here.
GOOD
what should be the permissible value of R. to check the fineness of cement, as per IS. for cement to be std. or of good quality ?
If weight retained on sieve is less than 10% of initial weight of cement taken then its considered well grounded cement
the cement which passes through 90microns sieve is the good quality of cement
required 99% cement from 90 maicron sieves forr good quality cement.
As per IS For a good quality cement, the weight of residue retain on 90micrn sieve should not exceed 10percent
Dear sir
We have studied that while doing the fineness of cement not more than 10% cement retained on the 90 micron sieve , but when i studied Is 4031 part -1 , i did not see in code these words. so sir please justify me is it is right or wrong ? if right then give me the attachment of code.
With Regards
Vivek Bharti
thank you for this information.
CAN U PROVIDE REFRENCE, IN WHICH CODE..????
In which code the 10% limit is mentioned ? can you answer this question ?
what is maximum or minimum limit of fineness by dry sieve?
and what is clause no. there limit is mention?
How can you calculate fineness modulus of cement from its given fineness percentage of 99% from no. 200 sieve? No other data is available