Macaroni and Cheese; Rice and Baked FishStaples – Provision + Food from Animals e.g. ... plasticity, or fat clays. 100 clay silt,' sandy clay clay clay Cam siity clay icam sandy clay Icam sandy loam Cam silt loam percent sand Ioa my sand sand sift . They absorb water and expand (swell), as much as ten percent or more when wet, and crack (shrink) when dry. The terms all have to do with the soil particle size. The multi-mix principle is based on the premise that a mixture of foods eaten together will complement each other to ensure an adequate intake of essential nutrients. Strain Stress Strength Toughness = area under curve. Average NC clays CL Lean clay Average NC silts ML Lean silt Very heavy/sticky/plastic clays CH Heavy clay Very heavy/sticky/plastic silts MH Heavy silt . The range of specific gravity (G s) was recorded from 2.67 to 2.75. By blending, potters could vary the color and texture of their clays as well. Clay has super fine particles that cling together and prohibit water and nutrient movement, while sand has course particles which allow water and nutrients to leach too rapidly. The term fat and lean are sometimes used to distinguish between highly plastic and slightly plastic soils. 84.5 to 80.5 Brown, moist sandy silt and silty sand. Fat clay was encountered near the bottom of B-13 at a depth of approximately 27 feet and a layer of lean clay was encountered in Test Pit TP-2 at a depth of approximately 10 fe et. Because of the variability of soils it is not appropriate to use typical values in design, tests are always required. L= Low Plasticity (Lean for Clay) (LL <50%) H= High Plasticity (Fat for Clay, Elastic for Silt) (LL ≥ 50%) (e.g. However, engineers define (in construction) soil as any earth material that can be moved without blasting, while geologists define as rocks or sediments altered by weathering. LABORATORY CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES TXDOT DESIGNATION: TEX-142-E CONSTRUCTION DIVISION 2 – 7 LAST REVIEWED: SEPTEMBER 2014 2.5 Organic Clay—Organic clay is a soil that would be classified as a clay except that its LL after oven drying (dry sample preparation) is less then 75% of its LL before oven drying (wet sample preparation). Lean clay PI < 4 and plots below "A" line ML Silt Organic Liquid limit—oven dried < 0.75 OL Organic clay Liquid limit—not dried OL Organic silt Silts and Clays. Fine-grained soil groups include lean clay (CL), silt (ML), organic clay/organic silt with liquid limit less than 50 (OL), fat clay (CH), elastic silt (MH), and organic clay/organic silt with liquid limit 50 or more (OH). 2. When clay is moist, it is very pliable, and can easily be moved and manipulated. high quality pottery clay) – Heavy Clay – Lean clay – Silt lSoil Condition – Wet – Optimum – Dry lStabilization Agents – Cement – Lime – Lime/Fly Ash – Cement/Slag. 88.5 to 84.5 Brown moist sandy silt with lenses of silty sand. In engineering practice, soil plasticity is determined by observing the different physical states that a plastic soil passes through as the moisture conditions change. Clay Bodies Rarely do potters use a single, sedimentary clay as a working clay. Organic Clay Lean Clay (PI = 10-30) Peat; FLOW CHART; Elastic Silt (PI = 5-40) UNIFIED SOIL CLASSIFICATION SYSTEM; FIELD IDENTIFICATION OF COARSE and FINE GRAINED SOILS ... CH- Fat Clay- LL>50 & plots above the "A" line. USCS Soil-class Description Cohesion (kPa) Friction angle (°) GW well-graded gravel, fine to coarse gravel 0 40 GP poorly graded gravel 0 38 GM silty gravel 0 36 GC clayey gravel 0 34 GM-GL silty gravel 0 35 GC-CL clayey gravel with many fines 3 29 SW well-graded sand, fine to coarse sand 0 38 SP poorly graded sand 0 36 SM silty sand 0 34 ... Low Plasticity Clay/Silt Mixtures. have LLs ranging from 10 to 30 and PIs ranging from 4 to 7 are called low plasticity clay/silt mixtures. Highly Organic Soils. 3.8 Field specifications To control the soil properties of earth constructions (e.g. Dilatancy or Shaking Test. Silt vs Clay . On the other hand, for the second boring, fat clay with sand, clayey gravel, sandy lean clay, and fat clay were respectively observed within the following ranges: 0-2.4 m, 2.4-3 m, 3-4.3 m, and 4.3-21.3 m. The lean clays were encountered at depths of 0.6 to 1.8 m, extending to depths ranging from about 3.7 to 6.1 m (T258-81: 2004). Clay – Clay is made up of tiny particles so it stores water well, but because of its tight grasp on water it expands greatly when moist and shrinks significantly when dry. Two issues must be addressed regarding the problem of strength degradation: (1) the

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