Sieve Analysis of Coarse Aggregates

Scope

The scope of sieve analysis is to get or provide information about the particles size distribution of coarse aggregates.

Coarse Aggregates

Coarse aggregates are those aggregates that are retained on a 4.75mm sieve when they are sieved through 4.75mm.

Standard

ASTM C136-05

Significance

The process of dividing aggregates in the fraction of the same size particles is called sieve analysis and it is used to check the aggregate suitability for construction according to our requirement.

Standard Sieve Sizes for Coarse Aggregates

  • 80mm
  • 40mm
  • 20mm,
  • 10mm
  •  4.75mm

Apparatus

  • Different size of sieves
  • Sieve shaker
  • Steel trays
  • Electronic weighting machine
  • Brush for cleaning sieves

Procedure

  1. Arrange the sieve in such pattern that the large size sieve on top whiles the least size at bottom.
  2. Now take the sample as you required by method of quartering or sample splitter.
  3. Then place the entire coarse aggregate sample on the top sieve and start shaking it. The minimum time for manual shaking is around 15 minutes.
  4. Determine the weight of material retained on each sieve by placing the retained sample in pan.
  5. Then calculate the percentage retained and percentage passes.

Calculation and observation

Sieve size(mm)Weight retained (g)Cumulative weight retained (g)Cumulative Percent retainedPercent Passing
     
     
     
     
     
     
     
     
     
     
     
     

You can easily download this calculation sheet by clicking here:

πΆπ‘’π‘šπ‘’π‘™π‘Žπ‘‘π‘–π‘£π‘’ %π‘Ÿπ‘’π‘‘π‘Žπ‘–π‘›π‘’π‘‘ = (π‘π‘’π‘šπ‘’π‘™π‘Žπ‘‘π‘–π‘£π‘’ π‘Ÿπ‘’π‘‘π‘Žπ‘–π‘›π‘’π‘‘ π‘€π‘’π‘–π‘”β„Žπ‘‘ / π‘‡π‘œπ‘‘π‘Žπ‘™ π‘€π‘’π‘–π‘”β„Žπ‘‘) βˆ— 100

π‘ƒπ‘’π‘Ÿπ‘π‘’π‘›π‘‘ % π‘ƒπ‘Žπ‘ π‘ π‘–π‘›π‘” = 100 – πΆπ‘’π‘šπ‘’π‘™π‘Žπ‘‘π‘–π‘£π‘’ % π‘ƒπ‘’π‘Ÿπ‘π‘’π‘›π‘‘ π‘Ÿπ‘’π‘‘π‘Žπ‘–π‘›π‘’π‘‘

 Finally, calculate the fines modulus by using the following formula.

F. M = Ξ£ cumulative % retained / 100

Precautions

  1. The sample should be taken by quartering.
  2. The sieve analysis process must be done carefully to prevent of the spilling of aggregate material.
  3. Remove the retained weight carefully with the help of brush.

Practical Application

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