1Civil Engineering 463Geotechnical Engineering LaboratoryLab #2: GradationJuly 25th, 2017MembersMiranda McNeillyMallika GudaDouaa RedhaAli JasimVicky LauIntroduction2a. The sieve analysis, or the gradation test, is a practice or procedure used to assess the particle sizedistribution, which is also called gradation of a granular material. The grain size distribution is often ofcritical importance to the way the material performs in use. A sieve analysis can be performed on anytype of non-organic or organic granular materials, including sands, crushed rock, clays, granite,feldspars, coal, soil, a wide range of manufactured powders, grain and seeds, down to a minimum sizedepending on the exact method. Being such a simple technique of particle sizing, it is one of the mostcommon.b.The grain size distribution of soils is a very important parameter which lets us to classify the soils in most basicform. Sands and gravels are two such types. From the complete grain-size distribution curve, we can obtain twotypes of information which is:1. Grading characteristics, which indicate the uniformity and range in grain-size distribution.2. Percentages (or fractions) of gravel, sand, silt and clay-size. (Terzhagi & Peck, 1996)By grain size distribution, we get to understand the initial engineering properties such as permeability, shearstrength, compressibility etc. As of today, we do not have a single great parameter that can define an entiregrain size distri ...
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