Stabilization of Local Expansive Subgrade Soil using Marble waste powder with Lime

Table of Contents

1. INTRODUCTION

1.1. Background

1.2. Problem statement

1.3. Objective

1.4. Justification

1.5. Scope of the work

1.6. Methodology of the report

1.7. Organization of the report

2. LITERATURE REVIEW

2.1. Distribution of expansive soil

2.1.1. Worldwide distribution of expansive soil

2.1.2. Distribution of expansive soil in Ethiopia

2.2. Mineralogical composition of expansive soils

2.3. Identification

2.3.1. Field identification

2.3.2. Laboratory identification

2.4. Damaging effect of expansive sub-grade soils

2.5. Mitigating the effect of expansive sub-grade soils

2.5.1. Soil replacement

2.5.2. Surcharge loading

2.5.3. Pre-wetting

2.5.4. Moisture control

2.5.5. Compaction control

2.5.6. Grouting

2.5.7. Mechanical stabilization

2.5.8. Chemical stabilization

2.5.9. Lime stabilization

2.5.10. Marble waste powder stabilization

3. METHODOLOGY

3.1. Materials used for testing

3.1.1. Expansive subgrade soil sample

3.1.2. Lime

3.1.3. Marble Waste Powder

3.1.4. Availability of marble waste powder in Ethiopia

3.2. Preparation and designation of test samples

3.3. Test procedure

3.3.1. Atterberg limits test

3.3.2. Grain size analysis test

3.3.3. Specific gravity test

3.3.4. Compaction test

3.3.5. California bearing ratio test

3.3.6. Twenty four hour free swell test

3.3.7. Unconfined compressive strength

3.3.8. One-dimensional swell consolidation

4. RESULTS AND DISCUSSION

4.1. Property of Bole-arabsa condominium project-13 untreated soil

4.1.1. Particle size analysis

4.1.2. Laboratory compaction test

4.1.3. Specific gravity of soil solids by water pycnometer

4.1.4. Atterberg limits

4.1.5. Classification

4.1.6. Free swell index

4.1.7. Unconfined comprehensive strength

4.1.8. California Bearing Ratio

4.2. Effect of lime on soil PH

4.3. Effect of stabilizer on Atterberg limit test

4.4. Effect of stabilizers on moisture density relationship characteristics

4.5. Effect of stabilizers on unconfined compressive strength (UCS) of soil

4.6. The effect of stabilizers on 24hour free swell index (FSI)

4.7. Effect of stabilizers on California Bearing Ratio (CBR)

4.8. Effect of stabilizers on swelling pressure test

5. CONCLUSIONS

6. RECOMMENDATION

Objective and Thematic Scope

This study aims to investigate the stabilization of local expansive subgrade soils by utilizing marble waste powder in combination with lime to minimize pavement damage and identify the optimal mix proportions for enhancing engineering properties.

• Stabilization of expansive subgrade soils using industrial byproducts (marble waste powder and lime).
• Characterization of untreated and treated soil through index and mechanical laboratory tests.
• Evaluation of engineering properties including CBR, UCS, and swelling potential.
• Development of a sustainable and cost-effective waste disposal and soil improvement strategy for road construction in Ethiopia.

Excerpt from the Book

Summary of Chapters

1. INTRODUCTION: This chapter outlines the thesis background, problem statement, research objectives, scope, and the methodology employed for the study.

2. LITERATURE REVIEW: This chapter provides an overview of expansive soils, their worldwide and local distribution, damaging effects, and various existing mitigation measures.

3. METHODOLOGY: This chapter details the materials used, experimental designs, standard testing procedures, and parameters adopted for both treated and untreated soil samples.

4. RESULTS AND DISCUSSION: This chapter presents the laboratory test findings, providing a detailed analysis and discussion regarding the performance of the stabilized soils.

5. CONCLUSIONS: This chapter summarizes the findings regarding the impact of marble waste powder and lime on the index and engineering properties of the soil.

6. RECOMMENDATION: This chapter offers suggestions for practical application and outlines directions for future research on the stabilization of expansive soils.

Keywords

marble waste powder, lime, expansive soil, CBR, UCS, swelling pressure, MDD, OMC, stabilization, subgrade, pavement, soil mechanics, civil engineering, geotechnical engineering, Addis Ababa.

Frequently Asked Questions

What is the core focus of this research?

The research focuses on the stabilization of weak, locally sourced expansive subgrade soils using a combination of marble waste powder and lime to prevent pavement damage.

What are the primary fields covered in this document?

The document covers geotechnical engineering, soil stabilization techniques, road construction materials, and environmental waste management practices.

What is the main objective of this study?

The main objective is to characterize the behavior of stabilized versus non-stabilized expansive soils and to determine an optimal mix ratio of marble waste powder and lime to enhance engineering characteristics.

Which scientific methods are applied in this work?

The study employs a range of standard laboratory tests, including Atterberg limits, Proctor compaction tests, CBR, unconfined compressive strength, and one-dimensional swelling pressure tests.

What topics are discussed in the main body?

The main body discusses the background of expansive soils, their mineralogical properties, existing mitigation techniques, the specific material testing procedures, and an analysis of how stabilizers affect soil density, strength, and swelling potential.

Which keywords best characterize this work?

Key terms include marble waste powder, expansive soil, CBR, UCS, swelling pressure, soil stabilization, and subgrade material.

What was the identified optimal mix ratio?

The study concluded that the optimal mix for the specific local expansive soil is 87% soil, 10% marble waste powder, and 3% lime.

How does the addition of marble waste powder affect soil properties?

The study indicates that proper addition of the stabilizers increases Maximum Dry Density (MDD), enhances CBR values, and significantly reduces the plasticity index and swelling pressure of the expansive soil.