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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 100-200 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 30-50 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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