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05jb1lect2grad

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Aggregate Properties - Gradation
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   NCAT 1 Aggregate Properties Gradation   NCAT 2 * Uniformly graded - Few points of contact - Poor interlock (shape dependent) - High permeability * Well graded - Good interlock - Low permeability * Gap graded - Only limited sizes - Good interlock - Low permeability Types of Gradations   NCAT 3 Aggregate Gradation ã  Use 0.45 Power Gradation Chart ã  Blend Size Definitions  – maximum size  – nominal maximum size ã Gradation Limits  – control points  – restricted zone   NCAT 4 Example: 4.75 mm sieve plots at (4.75)  0.45   = 2.02   Sieve Size (mm) Raised to 0.45 Power 0 20 40 60 80 100   0 1 2 3 4 Percent Passing 0.45 Power Grading Chart

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Jul 23, 2017
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