CVG-2107 (Chapter 2) 3

CVG-2107 (Chapter 2) 3 - Prof. M. Fall - Uniersity of...

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Prof. M. Fall - Uniersity of Ottawa Prof. M. Fall - Uniersity of Ottawa 3 USDA system for determining soil separates Coarse grained soils Soil components Grain Size Determination Boulders 200 mm + Cobbles 200 mm to 63 mm Gravel Sand Coarse Medium Fine 0.5 to 2 mm 0.25 to 0.5 mm 0.07 to 0.25 mm Mesurable and barely discernable to eye 63 mm to 2.4 mm Mesurable and visible to eye Mesurable and visible to eye Mesurable and visible to eye 2. Main soil categories Mesurable and visible to eye Mesurable and visible to eye Fine grained soils Silt, clays The subdivision of fine grained soils is not based on the size of the grains but on the plascicity criteria ( chapter 4 ) 2. Main soil categories Generally, there is a mix of several soil categories, with however one dominant category) Then, in the description of the soil category, the name of the dominant category will be used in combination with an adjective describing the minority category Clayey sand (sand, majority; clay, minority ) Sandy
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This note was uploaded on 03/21/2011 for the course GNG 4124 taught by Professor Soils during the Spring '11 term at Uni. of Nottingham Ningbo.

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