Presentation on seive analysis on coarse and fine aggregate.pptx

Seive analysis

1. Sieve Analysis Of Coarse And Fine Aggregates Presented By: Rituraj Saikia,Wasif Akhtar M.Tech civil 1 st semester

2. Sieve Analysis : Coarse Aggregate Introduction For any RCC structure, concrete play major part of civil construction. The serviceability and durability of any structure depends upon the proportion of ingredients use in concrete and their physical properties. The various ingredient use in cement concrete construction cement, Coarse and fine aggregate and water. One of the important test of coarse aggregate is determination of particle size distribution through sieve analysis

3. The apparatus set of seieves , weighing balance, enamel tray, pan, Sample of aggregate under test. According to IS.383.2016 Sieve use are 50 mm ,40 mm ,20 mm ,16mm,12.5mm,10 mm ,4.75 mm and pan.

4. Procedure : Take 1 kg of given sample Arrange the sieve size in the order according to IS 383 :2016 Percentage retained and percentage passing through each sieve are weighted and noted

5. IS Sieve (mm) Total weight retained on each sieve(gm)   Percentage of Total weight retained on each sieve(x)   Cumulative Percentage of Total weight retained Percentage Passing(Y) 50         40         20         16         12.5         10         4.75         pan         OBSERVATION SHEET Y= 100 - Cumulative Percentage of Total weight retained  

6. Analysis and Conclusion : The percentage passing so obtained shall than be compared with the permissible values given in Table 7 of IS.383:2016. Since the grading of the Coarse aggregate greatly influences the concrete mix. Therefore it is important that the correct experimental procedure as per Indian standard code 383.2016 should be followed.

7. SIEVE ANALYSIS OF FINE AGGREGATE Purpose : To determine the Grading Zone of Fine Aggregate

8. Apparatus set of sieves weighing balance enamel tray pan Sample of aggregate under test. According to IS.383.2016 Sieve use are 10mm, 4.75 mm ,2.36mm ,1.18 mm ,0.6mm,0.3mm,0.15 mm and pan.

9. Procedure : Take 1 kg of Dry sample Arrange the sieve size in the order according to IS 383 :2016 Percentage retained and percentage passing through each sieve are weighted and noted

10. IS Sieve (mm) Total weight retained on each sieve(gm)   Percentage of Total weight retained on each sieve(x)   Cumulative Percentage of Total weight retained Percentage Passing(Y) 10         4.75         2.36         1.18         0.6         0.3         0.15         pan         OBSERVATION SHEET Y= 100 - Cumulative Percentage of Total weight retained  

11. Analysis and Conclusion : The percentage passing so obtained shall than be compared with the permissible values given in Table 9 of IS.383:2016. Since the Zone of Fine aggregate greatly influences the concrete mix. Therefore it is important that the correct experimental procedure as per Indian standard code 383.2016 should be followed.

12. Fineness Of Cement By Blaine Air Permeability Test

13. Aim Of The Experiment: The aim is to determine the fineness or surface area per gram of the cement as per IS code 4031(P2):1999 The fineness of cement is measured as specific surface. Specific surface is expressed as the total surface area in square meters of all the cement particles in one kilogram of cement. The higher the specific surface is, the finer cement will be. Principle :

14. The Apparatus: Blaine Air permeability apparatus Balance Timer Environmental Condition: Temperature= 27±2ºc Humidity= 65%(max)

15. Procedure : Determination of the density of the cement by using a device such as a pycnometer and Le- chatelier flask. Determination of the Bed volume: Apply a very thin film of light mineral oil to the cell interior. Place the perforated disc on the ledge in cell. Place two new filter paper discs on the perforated disc. Fill the cell with mercury. Level the mercury to the top of the cell with a glass plate. Remove the mercury from cell and it,  M 1 . Remove the top filter paper from the permeability cell and compress a trial quantity of 2.80 g of cement into the space above filter paper to the gauge line in the cell. Place the other filter paper above the cement bed. Fill the remaining space in the cell above the filter paper with mercury. Level the mercury to the top of the cell with a glass plate and remove mercury from the cell and weigh it,  M 2 .

16. Calculate the volume occupied by the cement bed in the cell from the following equation. V = (M 1 -M 2 )/D , D = Density of mercury

17. C. Determination of apparatus constant: To determine the apparatus constant (K),we place a standard cement sample so as to give the cement bed of porosity e=0.500.Now calculated the weight of standard cement W=(1-e) ρ o V Place the perforated disc on the ledge at the bottom of the cell and place on it a new filter paper disc. Place the weighed quantity of standard cement, W, in the cell taking care to avoid loss. Tap the cell to level the cement. Place a second new filter paper disc on the levelled cement. Compress the cement with the plunger until the plunger collar is in contact with the top of the cell. Attach the permeability cell to the manometer tube with an air tight connection and slowly evacuate the air in the manometer U-tube until the liquid reaches the top mark, then tightly close the valve. Start the timer when the bottom of the meniscus reaches next to the top mark and stop the timer when the bottom of the meniscus reaches the bottom mark. Record the time t and temp. of test. Repeat the whole procedure on two further samples of the same reference cement. Calculate the average time of the three determinations. Then calculate the apparatus constant using the formula given below.

18. D. Determination of Fineness: It is done by same procedure as used in to determine the apparatus constant, but this time using the cement whose fineness is to be calculated. Now calculated the fineness of cement by using the formula:

19. Where, So is the specific surface of the reference cement (cm²/g), e porosity of the bed of cement under test, e o porosity of the bed of reference cement, t measured time for the cement under test(s), t o mean of the three times measured on the reference cement(s), p density of the cement under test (g/cm³), p o density of the reference cement (g/cm³). ɳ air viscosity at the test temperature taken from Table 1. ɳo air viscosity at the mean of the three temperatures (Table 1) for the reference cement.

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