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IDAHO STATE UNIVERSITY COLLEGE OF ENGINEERING DEPARTMENT OF CIVIL ENGINEERING. LIME-FLY ASH (LFA) STABILIZATION OF PAVEMENT SUBGRADE SOILS. Research sponsored by. IDAHO TRANSPORTATION DEPARTMENT. Prepared by Meron Y. Araya Praveen Katamanin. Advisors

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lime fly ash lfa stabilization of pavement subgrade soils

IDAHO STATE UNIVERSITY

COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL ENGINEERING

LIME-FLY ASH (LFA) STABILIZATION OF PAVEMENT SUBGRADE SOILS

Research sponsored by

IDAHO TRANSPORTATION DEPARTMENT

Prepared by

Meron Y. Araya

Praveen Katamanin

Advisors

Dr Manoocher Zoghi (Chair of Civil & Environmental Engineering Dept, ISU)

Dr Jim Mahar (Prof)

Dr Arya Ebrahimpour (Prof)

April 8, 2009

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LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

Presentation Outline

Introduction

Scope of Work

Research Soil Characterization

Soil Stabilization Methodology

Results

Conclusions and Recommendations

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

1 introduction history of development lime caoh cao fly ash class c class f

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

1. Introduction

History of Development

Lime (CaOH, CaO)

Fly Ash (Class C, Class F)

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

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LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

2. Background

Lime stabilization

Fly Ash stabilization

Lime-Fly Ash (LFA) stabilization

Reduced Plasticity

Higher strength

Increased CBR values

Lower thickness of pavement

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide5

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

3. ResearchSoil Characterization

Geologic setting of Eastern Idaho

Soil properties based on USDA soil Survey

McDole Series

Research Soil

Silt soil

Other Soil units in Pocatello

Pocatello Silt loam

Delphic Silt

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide6

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

ResearchSoil Characterization, Cont’

  • Idaho soil distribution dominated by Silt soil
  • Research soil is representative of Southeast Idaho soil distribution
  • Best suited soil for LFA stabilization

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide7

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • Location of the site

Courtesy City of Pocatello

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide8

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • Location of the site

Courtesy City of Pocatello

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide9

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

3. ResearchSoil Characterization

Soil properties considered

Plasticity Index (PI)

Proctor Compaction test

Gradation

Soil PH

Unconfined Compression Test (UCC)

California Bearing Ratio (CBR)

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide10

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide12

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • Summary of Properties of Untreated Soil
    • Very deep and well drained
    • Wind-blown deposits
    • Slope/stream wash on to Flood plain
    • Liquid Limit ranges between 20 to 30%
    • Plasticity Index ranges between 5 to 12%
    • Soil classified as ML/A-7-6
    • Low plasticity soil

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide13

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • Summary of Properties of Untreated Soil
    • Low active clay content
    • Fairly low undrained shear strength
    • Alkaline
    • Low strength soil
    • Susceptible to moisture content change
    • Ideal for Lime-Fly ash treatment

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide14

IDAHO STATE UNIVERSITY

COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL ENGINEERING

4. Soil Stabilization

Mechanism of stabilization

Pozzolanicreation of pozzolans (Al2O3, SiO2) with lime (CaOH, CaO) in the presence of water

Lime and Fly Ash Proportion

Lime to Fly Ash ratio – 1:2 and 1:3

Lime-Fly Ash percentage by dry weight

LFA – 2%, 3%, 4%, 6%, 8%,10% and 12%

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

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LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

4. Soil Stabilization

Soil properties considered

Plasticity Index (PI)

Proctor Compaction test

Soil PH

Unconfined Compression Test (UCC)

California Bearing Ratio (CBR)

Subgrade Modulus – R Value

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

5 results and conclusion atterberg limit test

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

5. Results and Conclusion

Atterberg Limit Test

slide17

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • 5. Results and Conclusion
  • Standard Proctor Compaction Test

Figure 3 – Standard Proctor Compaction Curve for treated and Untreated Soil

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide18

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • 5. Results
  • Soil pH Test

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

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LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • 5. Result
  • California Bearing Ratio (CBR) Test

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

5 result

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

5. Result

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

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LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

5. Result, cont’

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide22

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

5. Result, cont’

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide23

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • 5. Results, cont’
  • Correlation between CBR and Subgrade Modulus

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide24

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • 5. Result, cont’
  • Correlation between CBR and Subgrade Modulus

NOTE –

Correlation between CBR and R-value was made based on: CBR = 1500 Mr

Mr = 1155 + 555 R

(Papaginannakis, 2008)

(Pavement Design and Materials)

Figure 4 Correlation Curve among LFA percentage, Unsoaked CBR and R-Value

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

slide25

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • Conclusions and Recommendations
  • LFA stabilization increased CBR value significantly
  • Improve soil strength
  • Reduces Plasticity
  • Reduced pavement thickness
  • Improved Subgrade Modulus values

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

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LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

  • 6. ConclusionandRecommendations, cont’
  • LFA stabilization (CBR > 16)
  • Lime stabilization (CBR > 21)
  • Fly Ash stabilization (CBR > 23)
  • Economic impact
  • Environmental impact
  • Type of soil
  • Purpose of stabilization
  • Availability of materials

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING

thank you

LIME-FLY ASH STABILIZATION OF SUBGRADE PAVEMENT SOIL

Thank you !!

Questions ?

IDAHO STATE UNIVERSITY, COLLEGE OF ENGINEERING

DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING