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Presentation transcript:

Civil Engineering Department Atterberg's Limits Prof Neelam Belani Assistant Professor Civil Engineering Department IT,NU

Content Soil Consistency Atterberg Limits Plasticity Index Liquid Limit Plastic Limit Shrinkage Limit Plasticity Index Liquidity Index Plasticity Chart

Soil Consistency Soil consistence provides a means of describing the degree and kind of cohesion and adhesion between the soil particles as related to the resistance of the soil to deform or rupture Soil Behave Like: SOILD at very low moisture content LIQUID at very high moisture content

- + Soil Consistency - Atterberg Limits Depending on Moisture Content soil can be divided into: Solid Semi-Solid Plastic Liquid - Shrinkage Limit (SL) LI = 0 Moisture Content (w) Plastic Limit (PL) Liquidity Index (LI) Plasticity Index (PI) = PL - LL Liquid Limit (LL) LI = 1 +

Liquid Limit - Definition Liquid Limit (LL) is defined as the moisture content at which soil begins to behave as a liquid material and begins to flow (Liquid limit of a fine-grained soil gives the moisture content at which the shear strength of the soil is approximately 2.5kN/m2)

Liquid Limit - Measurement First Method Casagrande Apparatus ASTM D-4318

Liquid Limit - Measurement Liquid Limit (LL) at N = 25

Liquid Limit – Flow Index

Liquid Limit - Measurement Second Method Fall Cone Method BS1377

Liquid Limit - Measurement Liquid Limit (LL) at d = 20 mm

Plastic Limit - Definition The moisture content (%) at which the soil when rolled into threads of 3.2mm (1/8 in) in diameter, will crumble.

Plastic Limit - Measurement First Method ASTM D-4318 PL = w% at d 3.2 mm (1/8 in.)

Plastic Limit - Measurement Second Method Fall Cone Method BS1377 Plastic Limit (PL) at d = 20 mm

Plasticity Index - Definition Plasticity Index is the difference between the liquid limit and plastic limit of a soil. PI = LL – PL

Question!! Plasticity Index - Definition PI (%) = 4.12 IF (%) PI (%) = 0.74 IFC (%) Question!! Which PI is more reasonable for construction projects? The high one or the low one?!

Shrinkage Limit - Definition The moisture content, in percent, at which the volume of the soil mass ceases to change

Shrinkage Limit - Definition

Shrinkage Limit - Measurement

- + Soil Consistency - Atterberg Limits Depending on Moisture Content soil can be divided into: Solid Semi-Solid Plastic Liquid - Shrinkage Limit (SL) LI = 0 Moisture Content (w) Plastic Limit (PL) Liquidity Index (LI) Plasticity Index (PI) = PL - LL Liquid Limit (LL) LI = 1 +

Liquidity Index - Definition

Plasticity Chart - Definition Casagrande (1932) studied the relationship of the plasticity index to the liquid limit of a wide variety of natural soils. He proposed a plasticity chart

Organic Inorganic Silt Clay