TABLE OF CONTENTS
DECLARATION......................................................................................................i
APPROVAL...........................................................................................................ii
ACKNOWLDGEMENTS.......................................................................................... iii
ABSTRACT..........................................................................................................iv
LIST OF FIGURES............................................................................................... vii
LIST OF TABLES ............................................................................................... viii
LIST OF ACRYONMS/ABBREVIATION ....................................................................ix
CHAPTER ONE ...............................................................................................1
1.1 INTRODUCTION............................................................................................ 1
1.1.1 Background................................................................................................ 1
1.2 Problem Statement........................................................................................ 2
1.3 Objectives of the study .................................................................................. 2
1.3.1 Main objective ............................................................................................ 2
1.3.2 Specific Objectives ...................................................................................... 2
1.4 Scope........................................................................................................... 3
1.5 Justification................................................................................................... 3
CHAPTER TWO ..............................................................................................4
LITERATURE REVIEW....................................................................................4
2.0 Introduction.................................................................................................. 4
2.1 Strength ....................................................................................................... 4
2.2 Moisture content ........................................................................................... 4
2.3 Shrinkage/swelling......................................................................................... 4
2.4 Shrinkage/swelling......................................................................................... 5
2.5 The role of sub-grade .................................................................................... 6
2.6 Soil stabilization ............................................................................................ 8
2.6.1 Types of stabilization .................................................................................. 9
2.7 Previous studies on soil stabilization using other means than cement and lime. .11
vi
CHAPTER THREE .........................................................................................14
METHODOLOGY...........................................................................................14
3.0 Introduction.................................................................................................14
3.1 Materials......................................................................................................14
3.1.1 Soil...........................................................................................................14
3.1.2 Coffee husk ash.........................................................................................14
3.2 Tests that were carried out ...........................................................................15
CHAPTER FOUR ...........................................................................................16
RESULT ANALYSIS AND DISCUSSION.........................................................16
4.0 Introduction.................................................................................................16
4.1 Result analysis .............................................................................................16
4.1.1 Particle size distribution..............................................................................16
4.2.2: Plasticity index .........................................................................................18
4.2.3 Maximum Dry Density ................................................................................18
4:2.4 California Bearing Ratio..............................................................................19
CHAPTER FIVE.............................................................................................20
CONCULSIONS AND RECOMMENDATIONS .................................................20
5.1 CONCLUSIONS .............................................................................................20
5.2 RECOMMENDATIONS....................................................................................20
REFERENCES .....................................................................................................21
APPENDICES .....................................................................................................24
APPENDIX I: PHOTOS TAKEN..............................................................................24
APPENDIX II: LAB TESTS....................................................................................25
ABSTRACT This project report titled “evaluating the effect of coffee husk ash used as a soil stabilizer” majorly aimed at reducing the cost of soil stabilization in that the usage of a cheaper alternative stabilizing agent was undertaken by assessing the properties of soil free of CHA and a mixture of soil and CHA of varying amounts. The tests carried out on its properties including grading, Atterberg limits, MDD, and CBR tests which proved that the properties of the soil improved with increasing amounts of CHA up to the optimum of 10% and past that the properties deteriorated as fully elaborated in this report.
