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Shrinkage limit

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Muni Raja B

The document defines the shrinkage limit of cohesive soils as the water content at which further moisture loss will not cause a decrease in volume. It describes the ASTM test method for determining the shrinkage limit, which involves measuring the mass and volume of a soil sample before and after drying to calculate the water content at which shrinkage ceases. The shrinkage limit is the point where the soil phase changes from a saturated solid to an unsaturated solid on the soil-water phase diagram.

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SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION- D247) Volume of soil Moisture content LL PL SL Definition: The shrinkage limit of cohesive soils is defined as the water content at which further loss of moisture will not cause a decrease in volume.
SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION-D247) Definition: The shrinkage limit of cohesive soils is defined as the water content at which further loss of moisture will not cause a decrease in volume. Shrinkage Limit = Wi- W ゐ = 1 2 2 100 = 1 2 100 Initial water content Change in water content Shrinkage limit= ( 12 2 )100 1 2 100 Va Vw Vs Wa= 0 Ww Ws Initial phase diagram Final phase diagram Ws Ww Vw
SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION-D247) 44mm 12.7mm Soil volume= Vi Soil Mass= Mi Soil volume= Vf Soil Mass= Mf Soil volume= V1 Soil Mass= M1 Soil volume= V2 Soil Mass= M2 Mercury volume= Vm Empty mould volume= Ve Dry Soil volume Vf= Ve - Vm Shrinkage limit= ( 12 2 )100 1 2 100
SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION-D247) Shrinkage limit = ()粒 2 100 Shrinkage limit = ( 粒 粒 1 )100 Shrinkage limit = 粒 粒 = 1 SR= Shrinkage Ratio Other Formulae S r = ゐ

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Shrinkage limit

  • 1. SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION- D247) Volume of soil Moisture content LL PL SL Definition: The shrinkage limit of cohesive soils is defined as the water content at which further loss of moisture will not cause a decrease in volume.
  • 2. SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION-D247) Definition: The shrinkage limit of cohesive soils is defined as the water content at which further loss of moisture will not cause a decrease in volume. Shrinkage Limit = Wi- W ゐ = 1 2 2 100 = 1 2 100 Initial water content Change in water content Shrinkage limit= ( 12 2 )100 1 2 100 Va Vw Vs Wa= 0 Ww Ws Initial phase diagram Final phase diagram Ws Ww Vw
  • 3. SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION-D247) 44mm 12.7mm Soil volume= Vi Soil Mass= Mi Soil volume= Vf Soil Mass= Mf Soil volume= V1 Soil Mass= M1 Soil volume= V2 Soil Mass= M2 Mercury volume= Vm Empty mould volume= Ve Dry Soil volume Vf= Ve - Vm Shrinkage limit= ( 12 2 )100 1 2 100
  • 4. SHRINKAGE LIMIT (ASTM-2007 TEST DESIGNATION-D247) Shrinkage limit = ()粒 2 100 Shrinkage limit = ( 粒 粒 1 )100 Shrinkage limit = 粒 粒 = 1 SR= Shrinkage Ratio Other Formulae S r = ゐ