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11 Cards in this Set
- Front
- Back
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Soil Horizons (top to bottom) |
O-Organics: plant residues A-surface: organics and mineral matter B-subsoil: contains physical/chemical alterations of parent soil c-parent rock: rock parent material |
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What are Histosols |
deep organic soil (peats,muck, decomposed plant remains)-upper 32 inches of soil |
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What are Spodisols |
discolored soil from aluminum, humus, and iron. Has weird spots all over. |
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What are Ultisols |
transition of color. Light to dark, have markers of intense leeching (caused by drainage in the soil) |
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What are Entisols |
All white soil-no strata. Includes no evidence of any development. |
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AASHTO-American Association of State Highway and Transportation Officials. |
used for highway work Soil classification requires: grain size analysis, liquid limit, plasticity index |
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USCS-Unified soil classification system |
ASTM D 2487- 3 classifications of soil and 15 subgroups Used by federal agencies and engineers Soil classification requires: grain size distribution, liquid limit, and plasticity index |
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the theory behind the liquid limit and plasticlimit |
used mainly on silts and clays. Soils retain water when moist- these tests are used to measure that. These tests are used to make sure the soil can withstand moisture content and still remain strong. |
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liquid limit |
the dividing line between plastic and semi solid state |
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plastic limit |
the dividing line between semisolid and solid states |
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plasticity index |
LL-PL High PI: clay Low PI: silt PI=0: not clay or silt |
