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Atterberg Limits Liquid Limit & Plastic Limit of Soils Topic N.

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Presentation on theme: "Atterberg Limits Liquid Limit & Plastic Limit of Soils Topic N."— Presentation transcript:

1 Atterberg Limits Liquid Limit & Plastic Limit of Soils Topic N

2 Atterberg Limits Liquid Limit (LL) Plastic Limit (PL) Shrinkage Limit (SL) Moisture contents Used for classification, Comparisons, identification. Topic N

3 Figure 1: Soil States Plasticity Index SolidSemi-SolidPlastic Liquid Shrinkage Limit Plastic Limit Liquid Limit Moisture Content LowHigh

4 Plasticity Index (PI) Numerical difference between LL and PL PI = LL - PL Range of water content Figure 1 Topic N

5 Liquid Limit Test (Apparatus) Porcelain mixing dish Spatula Grooving tool Number 40 sieve Figure 2 & Table 1 Topic N

6 Figure 2: Liquid Limit Device Topic N

7 Table 1: Measurements (LL) Topic N

8 Adjustment of Device (LL) Cup drops freely when crank is turned? Measure cup drop – 1.00 cm Topic N

9 Test Procedures (LL) Grind grams of dried soil Sieve soil Mix in distilled water Place soil on device Make groove in soil (Figure 3) Record number of drops Scrape soil Topic N

10 Figure 3: Liquid Limit Test Topic N

11 Flow Curve (LL) Logarithm of the number of drops and water content Straight line Select point with 25 drops= LL Figure 4 Topic N

12 Figure 4: Flow Curve (LL) Topic N Log of number of drops LLWater Content

13 Plastic Limit Test (Apparatus) Hard flat surface Porcelain mixing dish Distilled water Number 40 sieve 1/8 inch welding rod Balance Drying oven Topic N

14 Test Procedure (PL) Grind grams Sieve soil Mix distilled water Roll 10 grams out into a coil Cut into 6-8 pieces Knead soil Topic N

15 Calculation (PL) Average Water content from 3 trials. Topic N

16 Non-Plastic When LL or PL tests cannot be performed – Non-Plastic (NP) PL=negative – NP Topic N

17 Figure 5: Data Sheet Topic N


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