Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 88 views

    Atterberg's Limits: College of Engineering Civil Engineering Department Soil NCE 412

    Uploaded by

    Mark
    The document discusses different soil consistency states based on moisture content including solid, semi-solid, plastic and liquid. It covers the Atterberg limits of liquid limit, plastic limit and shrinkage limit which define the boundaries between these states. Measurement methods for each limit are presented along with definitions of plasticity index, liquidity index and how to use a plasticity chart for soil classification.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd

    Atterberg's Limits: College of Engineering Civil Engineering Department Soil NCE 412

    Uploaded by

    Mark
    88 views29 pages
    The document discusses different soil consistency states based on moisture content including solid, semi-solid, plastic and liquid. It covers the Atterberg limits of liquid limit, plastic limit and shrinkage limit which define the boundaries between these states. Measurement methods for each limit are presented along with definitions of plasticity index, liquidity index and how to use a plasticity chart for soil classification.

    Original Description:

    Original Title

    Lecture_4_-_Consistancy_of_Soil_-_Atterberge_Limits

    Copyright

    © © All Rights Reserved

    Available Formats

    PPT, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document discusses different soil consistency states based on moisture content including solid, semi-solid, plastic and liquid. It covers the Atterberg limits of liquid limit, plastic limit and shrinkage limit which define the boundaries between these states. Measurement methods for each limit are presented along with definitions of plasticity index, liquidity index and how to use a plasticity chart for soil classification.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    88 views29 pages

    Atterberg's Limits: College of Engineering Civil Engineering Department Soil NCE 412

    Uploaded by

    Mark
    The document discusses different soil consistency states based on moisture content including solid, semi-solid, plastic and liquid. It covers the Atterberg limits of liquid limit, plastic limit and shrinkage limit which define the boundaries between these states. Measurement methods for each limit are presented along with definitions of plasticity index, liquidity index and how to use a plasticity chart for soil classification.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    of 29

    COLLEGE OF ENGINEERING

    Civil Engineering Department

    Soil Mechanics
    NCE 412

    Atterberg's
    Limits

    Lecture 4
    Week 2
    Content

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

    Soil consistency 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:


    SOLID at very low moisture content
    LIQUID at very high moisture content
    Soil Consistency - Atterberg Limits

    Depending on Moisture Content soil can be


    divided into:
    - 1. Solid
    Shrinkage Limit (SL)
    Moisture Content (w)

    2. Semi-Solid
    LI = 0
    Plastic Limit (PL)
    Liquidity Plasticity Index
    3. Plastic Index (LI) (PI) = PL - LL
    Liquid Limit (LL)
    LI = 1
    + 4. Liquid
    Questions?!

    20:00 min
    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

    w1=44

    w2=39

    Group Work
    Calculate Flow Index
    N1=20 N2=30

    Flow Index
    Liquid Limit - Measurement

    Second Method

    Fall Cone Method BS1377


    Liquid Limit - Measurement

    Liquid Limit (LL) at d = 20 mm


    Questions?!

    45:00 min
    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


    Questions?!

    75:00 min
    Plasticity Index - Definition

    Plasticity Index is the difference between


    the liquid limit and plastic limit of a soil.

    PI = LL – PL
    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?!
    Questions?!

    90:00 min
    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
    Questions?!

    90:00 min
    Soil Consistency - Atterberg Limits

    Depending on Moisture Content soil can be


    divided into:
    - 1. Solid
    Shrinkage Limit (SL)
    Moisture Content (w)

    2. Semi-Solid
    LI = 0
    Plastic Limit (PL)
    Liquidity Plasticity Index
    3. Plastic Index (LI) (PI) = PL - LL
    Liquid Limit (LL)
    LI = 1
    + 4. Liquid
    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
    Questions?!

    120:00 min

    You might also like