Fineness test of Cement

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1. Punjab Tianjin University Of Technology Lahore. Department : Civil Engineering Technology Name: MUHAMMAD UMAR Roll-N0: 18 CT -06 Semester: Course: Civil Engineering Material  

2. Practical No: 01 TOPIC : Fineness Test of Cement

3. WHAT IS FINENESS OF CEMENT? Fineness of cement is property of cement that indicates particle size of cement and specific surface area. And indirectly effect heat of hydration . IMPORTANCE OF FINENESS OF CEMENT 1) Fineness of cement affects hydration rate hence the rate of strength gain. 2) The smaller the particle size, the greater the surface area-to-volume ratio, and thus, the more area available for water-cement interaction per unit volume. 3 ) Therefore  finer cement reacts faster with water and the rate of development of strength and corresponding heat of hydration is high.

4. 4) Fineness is a measure of how even each granules are, leading to  a greater surface area & greater the surface area more the adhesion . 5) Bleeding can be reduced by increasing fineness. However, Increased fineness can also lead to the requirement of more water for workability, resulting in a higher possibility of dry shrinkage . 6) Fineness test is used to check the proper grinding of cement and measures the surface area of the cement particles per unit mass.

5. Apparatus :

6. Purpose: The purpose of this test is to find out the quality of coarse material present in cement .It is an indirect test of fineness of cement. Procedure for finding Fineness test of cement: 1) Take a sample of cement and rub the cement with your hands. The test sample should be free of lumps. 2) Now Take 100g of cement and note it as  W1 . 3) Pour 100g of cement in 90 µm sieve and close it with the lid. 4) Now place the sieve in Sieve shaking machine. You can also shake the sieve with your hands by Agitating the sieve in planetary and linear movements for 15 minutes .

7. 5) Next, weight the residue retained on the 90 µm sieve as  W2 . Then calculate the percentage of Weight of cement-retained on Sieve. 6) Repeat the above experiment with three different samples of cement and average the values for accurate results . The fineness of Cement Formula:

8. SERIAL NUMBER WEIGHT OF SAMPLE W1 (Grams) WEIGHT OF RESUIDE W2 (Grams) FINENESS % 01 90 5 94.44 02 90 4 95.56 03 90 7 92.22 Observation’s and Calculation’s: Result: Average fineness of cement is 94.07%. It’s means cement have good fineness.

9. Precaution’s: 1) Sample should be taken dried. 2) Sieving to be done with wrist action to prevent losses. 3) Weighing to done very accurately. 4) Use fresh cement. 5) Sieves which are used in practical must be clean. 6) Use plastic gloves because cement is not good for human skin .

10. THANKS FOR YOUR ATTENTION