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Unformatted text preview: passing each sieve opening size verses the sieve opening size (particle diameter). Winter 2013 2 CIVE 153 – Earth Engineering Grain Size Analysis Figure 2: Mechanical Sieve Analysis Department of
Engineering When inspection indicates that a sample contains an excessively high portion of silt and clay that results in the soil clumping, the soil is prewashed using the No. 200 (75µm) sieve before sieving through the nest of stacked sieves. The determination of grain size distribution by sieve analysis is limited to those materials larger than the No. 200 (75µm) sieve. For uses such as soil classification, this is sufficient since grain size distribution is not used to classify fine‐grained soils. Winter 2013 3 CIVE 153 – Earth Engineering Grain Size Analysis Department of
Engineering APPARATUS AND MATERIALS 1. Sieves 2. Brush for cleaning sieves 3. Balance ‐ sensitive to 0.01 g 4. Oven 5. Wash Sieve 6. Splitter 7. Various Pans (for measuring material amounts) PROCEDURE Sample Preparation 1. Using the quartering pan subdivide your sample until you get one sample that weighs approximately 1500g. 2. Determine and record the weight of your sample – “Initial Total Wt.” (leftover material can be placed back in the pan). a. Once the sample has been sieved through the nest of sieves (coarse material), the “fines” remaining in the sieve pan will be weighed and recorded. This is the material passing the No. 4 sieve – “Total Fines Wt”. 3. Using the small splitter, take all fine material passing the No. 4 sieve and split until an aprox. 100g sample is achieved (+/‐ 5grams). Record weight – “Fine Total Wt. before washing” 4. Wash 100g (aprox.) sample over a No. 200 (75µm) wash sieve until wash water is clear. Decant excess water, and place sample in oven to dry @ 110° +/‐ 5°C. Winter 2013 4 CIVE 153 – Earth Engineering Grain Size Analysis Department of
Engineering Sieve Analysis...
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