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Procedure for Sieve analysis of Fine Aggregates

Er. Parbhakar Dwivedi
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Theory:

There are three types of harmful substances normality found in aggregates. Firstly there are impurities which interfere with the hydrate; on of cement organic matter found in natural aggregates are Products of decay of vegetable matter and is in the form of humus. All organic matter is not harmful and it is best to check its effects by making cube tests. In case of doubts, however, it is advisable to conduct a test described below to find out whether the organic matter is in sufficient quantity as to Warrant further tests. Even if the test indicates that the organic matter is in large quantities the Aggregate is rejected only when the cube test with the aggregate in question shows lesser strength as Compared with the cube strength of the same mix proportions but made with known quality as aggregate. The second category consists of coatings which prevent development of good bond between Aggregate and cement paste. This category comprises of clay and slit clay is a material of size below 0.002 mm and silt size varies between 0.002 mm to 0.06mm. These materials may be in the Form of coating or in loose form. In both the cases, the presence of large percentage of fine materials is harmful because of their fineness, resulting in the larger surface Area. Silt and fine dust increases the amount of water for given workability there is a field method of determine volumetrically the Percentage of fine material. If the percentage exceeds 6% by volume, then more accurate test (sedimentation method) as explained in IS: 2386 (part II) should be conducted. The limits prescribed be IS are applicable to this sedimentation test. Normally if the field test indicates percentage of silt exceeding 6% by volume then it is advisable to wash the sand. All the tests for the impurities as mentioned in IS: 2386 (PART II) have not been reproduced this manual. Only procedure for field method of field method of determining silt content has been mentioned below.

Aim: To determine the properties of Fine aggregate for size and distribution by calculating Fineness modulus and deciding Grading Zone.

Apparatus: Drying Oven, IS Sieves 10mm, 4.75mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron, 150 mm, and pan. Weigh scale to the accuracy of 1g, Brush, Metal trays etc.

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Procedure for Fine Aggregate:

  • Sample of sand 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 1 kg of sample and dry it in oven at temp of 100-110 deg C.
  • Dried sample shall be then weighed (1 kg preferably) and sieved successively on sieves starting with 10mm and then through 150 micron.
  • Each sieve shall be shaken at least for two minutes on clean tray until no more trace passes.
  • Motion shall be varied like back and forth, left to right, circular clockwise and anti- clockwise and with frequent jarring.
  • Material shall not be forced through the mesh. Lumps in fines shall be broken against the wall of sieve
  • 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 weighed separately.

Calculations:

  • Fineness Modulus: Add values of Cumulative % Retained on each sieve and divide by 100. (Normally accepted limit of FM is value between 2.2 to 3.2. Higher value of FM indicates coarser sand whereas lesser value indicates finer one).

Permissible Limit:

S. No. IS Sieve Designation Permissible value % passing (Grading Zone - II)
1 10mm 100
2 4.75mm 90-100
3 2.36mm 75-95
4 1.18mm 55-90
5 600 micron 35-59
6 300 micron 8-30
7 150 micron 0-10

Reporting:

  • Calculate F.M. of the material and decide Grading Zone of material.

FORMAT FOR SIEVE ANALYSIS FOR FINE AGGREGATE IN SEPARATE TOPICS

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