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Procedure for Sieve Analysis of Coarse Aggregates

Er. Parbhakar Dwivedi
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Aim: To determine the properties of Coarse aggregate for size and grading distribution for Nominal 20mm or10 mm metal

Apparatus: Drying Oven, IS Sieves 40 mm, 20 mm, 16 mm, 12.5 mm, 10mm, and pan. – for Analysis of 20 mm metal, IS Sieves 20 mm, 16 mm, 12.5 mm, 10 mm, 4.75 mm ,2.36mm & pan

- for Analysis of 10 metal, Weigh scale to the accuracy of 1g Brush, Metal trays etc.

3 images

Procedure:

  • Sample of aggregate shall be collected as given earlier.
  • Sieves shall be cleaned and arrange in sequence in descending order. Pan shall at the lower most end and Lid on top.
  • Take around 5 kg of sample and dry it in oven at temp of 100-110 deg C.
  • Dried sample shall be then weighed (5 kg preferably) and sieved successively on sequence of sieves starting with 40mm and then through 4.75mm (For 20 mm down aggregate size) and through 2.36 mm (For 12.5/10 mm down aggregate size)
  • Each sieve shall be shaken at least for two minutes on clean tray until no more trace passes.
  • Each sieve shall be shaken at least for two minutes on clean tray until no more trace passes.
  • Material shall not be forced through the mesh. But for coarser than 20mm particles, placing is permitted (passing particles through sieve opening manually).
  • Sieves shall be brushed from underneath of mesh and pass on to the next.
  • On completion of sieving, material retained on each sieve is to be weighing separately.

Reporting:

  • The cumulative % by weight of the total sample passing each sieve, to the nearest whole number.
  • The % by weight of the total sample passing one sieve and retained on the next smaller sieve to the nearest 1 decimal.
  • Check for permissible limits for passing.

Permissible:

IS Sieve Designation PERCENTAGE PASSING FOR SINGLE-SIZED AGGREGATE OF NOMINAL SIZE
63mm 40mm 20mm 16mm 12.5mm 10mm
(1) (2) (3) (4) (5) (6) (7)
80mm 100 - - - - -
63mm 85 – 100 100 - - - -
40mm 0 – 30 85 – 100 100 - - -
20mm 0 – 5 0 – 20 85 – 100 100 - -
16mm - - - 85 – 100 100 -
12.5mm - - - - 85 – 100 100
10mm 0 – 5 0 – 5 0 – 20 0 - 30 0 – 45 85 – 100
4.75mm - - 0 – 5 0 – 5 0 – 10 0 - 20
2.36mm - - - - - 0 – 5

FORMAT FOR SIEVE ANALYSIS FOR COARSE AGGREGATE IN SEPARATE TOPICS

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