Experimental Study of Expansive Soil Stabilized with Terrazyme

DOI : 10.17577/IJERTV5IS010627

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  • Total Downloads : 720
  • Authors : M. Baby, A. Gowshik, A. V. Karthick Rajeshwar, M. Mohanasundram
  • Paper ID : IJERTV5IS010627
  • Volume & Issue : Volume 05, Issue 01 (January 2016)
  • DOI : http://dx.doi.org/10.17577/IJERTV5IS010627
  • Published (First Online): 02-02-2016
  • ISSN (Online) : 2278-0181
  • Publisher Name : IJERT
  • License: Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 International License

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Experimental Study of Expansive Soil Stabilized with Terrazyme

M. Baby

P.G. Student,

Department of Structural Engineering, SRG Engineering College,

Nammakal.

Abstract – In this experimental study, a step is taken to stabilize the black cotton soil for the construction of roads and buildings. A bio-enzyme called Terrazyme is used to stabilize the expansive soil. In this study, black cotton soil stabilized with Terrazyme of different dosages of 200ml/3m3, 200ml/2.5m3 and 200ml/2m3 are tested after the curing period of 0 days, 14 days and 28 days.

Keywords Terrazyme; Bio-Enzyme; Black Cotton Soil;

  1. INTRODUCTION

    Black cotton soil mostly present in the districts of Tamil nadu like Salem, Ramanathapuram, Coimbatore etc. Black co f

    1. Gowshik, A. V. Karthick Rajeshwar

      M. Mohanasundram4

      U.G Student, Department of Civil Engineering, Chennai Institute of Technology,

      Chennai.

      7

      Optimum moisture content

      %

      22.80

      8

      CBR Value %

      Soaked

      1.20

      Un soaked

      2.88

      9

      Swelling Pressure

      124

      10

      Uniform confined strength

      3.57

      11

      Coefficient of permeability

      1.6 * 10-8cm/sec

    2. Bio-enzyme

    The enzyme used for this experiment to stabilize the black cotton soil was Terrazyme.

    tton soil is good for agriculture because it is highly ertile.

    But it is not suitable for the construction of roads and foundation due to its instability. Black cotton soil is highly potential for shrinkage and swelling. Hence it is called as expansive soil. Even 5 cm rain can damage the roads and make unpassable.So it is necessary to stabilize the black cotton soil. When the expansive soil is up to a limit or small depth, the soil can be stabilized by replacing the soil with non-expansive soil. But when the black cotton soil is up to a greater depth, then the replacement is impossible. The other method to stabilize the black cotton soil is mixing the soil with chemical stabilizer.in this study, Terrazyme, a bio-enzyme is used to stabilize the black cotton soil. Terrazyme is a commercially available enzyme which improves the stability of the soil.

  2. MATERIALS

    1. Black cotton soil

      The black cotton soil which was used for this experiment was collected from sankari which is located in the district of Salem.

      S.No

      Properties

      Value

      1

      Specific Gravity

      2.67

      2

      Atterbergs limits

      Liquid limit %

      60.2

      Plastic limit %

      32

      Plasticity index

      28.2

      Shrinkage limit %

      10.2

      3

      Grain size distribution

      Gravel %

      0

      Coarse sand %

      8.57

      Fine sand %

      18.20

      Silt and clay %

      73.23

      4

      IS classification

      CH

      5

      Free swell index %

      72.00

      6

      Max dry density

      15

      S.No

      Properties

      Value

      1

      Specific Gravity

      2.67

      2

      Atterbergs limits

      Liquid limit %

      60.2

      Plastic limit %

      32

      Plasticity index

      28.2

      Shrinkage limit %

      10.2

      3

      Grain size distribution

      Gravel %

      0

      Coarse sand %

      8.57

      Fine sand %

      18.20

      Silt and clay %

      73.23

      4

      IS classification

      CH

      5

      Free swell index %

      72.00

      6

      Max dry density

      15

      Table 1 Properties Of Black Cotton Soil

      Table 2 Properties of Terrazyme

      Properties

      Value

      Boiling Point

      212°F

      Specific Gravity

      1.05

      Solubility

      100%

      Appearance

      Brown liquid

      Odour

      Non-obnoxious

      1. Amount of Terrazyme

        The amount of Terrazyme varies from 200ml/3.5m3 to 200ml/2m3

        For specimen 1

        200ml for 3.0 m3 of soil = 1.56 * 3.0 *1000

        = 4680 kg of soil For 1 kg = 0.051 ml of enzyme

        For specimen 2

        200ml for 2.5m3 of soil = 1.56 * 2.5 * 1000

        = 3900 kg of soil For 1 kg = 0.051 ml of enzyme

        For specimen 3

        200ml for 2.0 m3 of soil = 1.56 * 2.0 * 1000

        = 3120kg

        For 1 kg = 0.064 ml of enzyme

        Table 3 Amount of enzyme

        200ml/m3 of soil

        ml/kg of soil

        3.0

        0.042

        2.5

        0.051

        2.0

        0.064

        UNCONFINED COMPRESSION

        STRENGTH KN/M2

        200ml/m3 of soil

        ml/kg of soil

        3.0

        0.042

        2.5

        0.051

        2.0

        0.064

        UNCONFINED COMPRESSION

        STRENGTH KN/M2

        9

        8

        7

        6

        5

        4

        3

        2

        1

        0

        9

        8

        7

        6

        5

        4

        3

        2

        1

        0

  3. EXPERIMENTAL RESULTS

        1. Results on stabilized black cotton soil

          1. Atterberg limits

            The experiment gives the results of consistency limit for various proportions of black cotton soil with Terrazyme.

            0 days

            0 days

            7 days

            7 days

            14 days 28 days

            14 days 28 days

            Dosage

            Liquid limit

            Plastic limit

            Plasticity index

            Untreated

            60.2

            32

            28.20

            200ml/3.0m3

            59

            31.50

            27.50

            200ml/2.5m3

            57.78

            30.79

            26.99

            200ml/2.0m3

            56.53

            30.09

            26.44

            Dosage

            Liquid limit

            Plastic limit

            Plasticity index

            Untreated

            60.2

            32

            28.20

            200ml/3.0m3

            /td>

            59

            31.50

            27.50

            200ml/2.5m3

            57.78

            30.79

            26.99

            200ml/2.0m3

            56.53

            30.09

            26.44

            Table 4 consistency limits

            UNTREATED 200ML/3M3

            200ML/2.5M3 200ML/2M3

            UNTREATED 200ML/3M3

            200ML/2.5M3 200ML/2M3

          2. Standard proctor test

    For black cotton soil with different proportions of Terrazyme, standard proctor test was conducted and resulted below

    4. CBR test

    California Bearing Ratio test was conducted for different proportions of black cotton soil with Terrazyme. The mould is kept in water for 4 days and tested.

    Table 7 California bearing ratio

    Dosage

    0 day

    7

    days

    14

    days

    28

    days

    Untreated

    1.20

    200ml/3.0m3

    1.21

    1.33

    2.42

    5.23

    200ml/2.5m3

    1.23

    1.68

    2.60

    5.42

    200ml/2.0m3

    1.25

    1.95

    2.92

    5.67

    Dosage

    0 day

    7

    days

    14

    days

    28

    days

    Untreated

    1.20

    200ml/3.0m3

    1.21

    1.33

    2.42

    5.23

    200ml/2.5m3

    1.23

    1.68

    2.60

    5.42

    200ml/2.0m3

    1.25

    1.95

    2.92

    5.67

    Table 5 standard proctor test

    Dosage

    Optimum moisture content %

    Maximum dry density (g/cm3)

    Untreated

    22.80

    1.5

    200ml/3.0m3

    22.20

    1.542

    200ml/2.5m3

    21.90

    1.586

    200ml/2.0m3

    21.80

    1.612

    3. Unconfined compression test

    Unconfined compression strength of black cotton soil with Terrazyme was evaluated as follows

    Table 6 unconfined compression strength

    Dosage

    0

    days

    7

    days

    14

    days

    28

    days

    Untreated

    3.57

    3.82

    4.07

    4.69

    200ml/3.0m3

    4.04

    5.15

    5.80

    6.98

    200ml/2.5m3

    4.68

    5.58

    6.40

    7.90

    200ml/2.0m3

    5.28

    6.49

    7.09

    8.72

    0

    0

    0 days

    7 days

    14 days

    28 days

    0 days

    7 days

    14 days

    28 days

    untreated 200ml/3m3 200ml/2.5m3 200ml/2m3

    untreated 200ml/3m3 200ml/2.5m3 200ml/2m3

    5. Swelling pressure

    Swelling pressure test was conducted using consistometer and resulted and tabulated below.

    Table 8 Swelling pressure

  4. CONCLUSION

    CBR %

    CBR %

    6

    6

    5

    5

    4

    4

    3

    3

    2

    2

    1

    1

    SWELLING PRESSURE KN/M2

    140

    120

    100

    80

    60

    40

    20

    0

    SWELLING PRESSURE

    0 days 7 days 14 days 28 days

    SWELLING PRESSURE KN/M2

    140

    120

    100

    80

    60

    40

    20

    0

    SWELLING PRESSURE

    0 days 7 days 14 days 28 days

    • It is found that the value of liquid limit decreases from60.2% to 56.53% and the plastic limit also decreases from 32% to 30.09%

    • The UCS value increases from 3.57% to 8.72% when compared to actual soil with 4 weeks of curing.

    • It is founded that the CBR value increases from 1.20

      % to 5.67 %.

    • This experiment shows that the Swelling pressure reduces from 124 KN/m2 to 85.2 %

    • Maximum dry density increases from 1.5 g/cm3 to 1.612 g/cm3.

    • Optimum moisture content decreases from 22.80% to 21.80%

    • Hence the clayey property of expansive soil is changed.

    Dosage

    Swelling pressure

    Untreated

    124

    200ml/3.0m3

    120

    200ml/2.5m3

    108

    200ml/2.0m3

    85.2

    Dosage

    Swelling pressure

    Untreated

    124

    200ml/3.0m3

    120

    200ml/2.5m3

    108

    200ml/2.0m3

    85.2

    REFERENCES

    1. Faizal ali, Stabilization Of Residual Soil Using Liquid Chemical (2012), Civil Engineering Department, Faculty Of Engineering, national Defence Ministry Of Malaysia, Kuala Lumpur Malaysia.

    2. Brazetti.R and Murphy.S.R (2000), General Usage Of Bio-Enzyme Stabilizers In Road Construction In Brazil, 32nd annual meeting on paving Brazil, October 2000.

    3. Marasteanu.M.O, Hozalski.r, clync.t.r & velasquez.r,(2005),Preliminary Laboratory Investigation of Enzyme Solution as a soil stabilizer,minnesta department of transportation, research services.

    4. Das.B.M,Principles of Geo technical Engineering,5th Edition,California State University, Sacramento

    5. Das.B.M,Advanced Soil Mechanics, New York: taylor and francis, pp.123-178.

    6. Brooks (2009),Effect Of Swelling On Black Cotton Soil By Stabilizing Rice Husk Fly Ash

    7. Joydeep Sen & Jitendra Prasad Singh, Stabilization Of Black Cotton Soil Using Bio-Enzyme For A Highway Material.

    8. Bajpai.P,(2014),Non-Conventional Soil Stabilization Techniques The Way Forward To An Aggregate Free Pavement And A Cost Effective Method Of Road Construction,International Journal Of Scientific And Engineering Research.

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