Gradation of a soil is determined by reading the grain size distribution curve produced from the results of laboratory tests on the soil.
2.
Its grain size distribution is : 52 % under 10 microns; 33 % 10 microns to 30 microns, 15 % above 30 microns.
3.
This change will introduce some form of grain size distribution, which will have a significant impact on the ultimate physical properties of the material.
4.
The results of a sieve analysis are plotted as a grain size distribution curve, which is then analyzed to determine the soil gradation of the particular soil.
5.
The engineering properties of soils are affected by four main factors : the predominant size of the mineral particles, the type of mineral particles, the grain size distribution, and the relative quantities of mineral, water and air present in the soil matrix.
6.
If the soil has 5 12 % by weight of fines passing a # 200 sieve ( 5 % # 200 < 12 % ), both grain size distribution and plasticity have a significant effect on the engineering properties of the soil, and dual notation may be used for the group symbol.
7.
"' Abnormal "'or "'discontinuous grain growth "', also referred to as "'exaggerated "'or "'secondary recrystallisation grain growth "', is a grain growth phenomenon through which certain energetically favorable grains ( crystallites ) grow rapidly in a bimodal grain size distribution.
8.
A disturbed sample is one in which the structure of the soil has been changed sufficiently that tests of structural properties of the soil will not be representative of in-situ conditions, and only properties of the soil grains ( e . g ., grain size distribution, Atterberg limits, and possibly the water content ) can be accurately determined.
9.
In addition, because the source of sediment ( i . e . land, ocean, or organically ) is often correlated with how coarse or fine sediment grain sizes that characterize an area are on average, grain size distribution of sediment will shift according to relative input of land ( typically fine ), marine ( typically coarse ), and organically-derived ( variable with age ) sediment.
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