Term
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Definition
pieces of rocks with occasional particles of quartz, feldspar and other minerals
Grain Size > 2mm |
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Term
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Definition
made of mostly quartz and feldspar
Grain size 2mm to .06mm |
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Term
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Definition
microscopic soil fractions that consist of very fine quartz grains and some flake shaped particles that are fragments micaceous minerals
Grain size .06mm to .002mm |
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Term
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Definition
mostly flake shaped microscopic and submicroscopic particles of mica, clay minerals etc
particles which develop plasticity when mixed with a limited amount of water
Grain size <.002mm |
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Term
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Definition
1. Silica tetrahedron
2. Aluminum octahedron
basic units of clay minerals, create sheets with net negative charges on surface which attract water molecule dipoles |
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Term
| Mechanical Analysis of Soil |
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Definition
determination of the size range of particles present in a soil
1. Sieve Analysis
2. Hydrometer Analysis |
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Term
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Definition
| consists of shaking the soil sample through a set of sieves that have progressively smaller openings |
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Term
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Definition
| based on the principle of sedimentation of soil grains in water; particles settle at varying velocities depending on their shape, size and weight |
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Term
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Definition
| diameter in the particle size distribution curve corresponding to 10% finer D_10 |
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Term
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Definition
C_u = D_60/D_10
high C_u means low uniformity |
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Term
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Definition
| C_c = D_30^2/(D_60 * D_10) |
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Term
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Definition
soil in which most of the soil grains are the same size
characterized by a high slope within a given region on a particle distribution plot |
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Term
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Definition
soil in which the particle sizes are distributed over a wide range
characterized by a low slope on the particle size distribution plot extending over a wide range of sizes
C_u of 4 for gravels, 6 for sands
C_c of 1 to 3 for gravels and sands |
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Term
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Definition
| soil with a combination of two or more uniformly graded fractions |
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