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This is to certify that the research work, "effect of sodium sulphate on engineering properties of laterite soil" by ---, Reg. No. EE/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.

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PROJECT DESCRIPTION: This work "effect of sodium sulphate on engineering properties of laterite soil" research material is a complete and well researched project material strictly for academic purposes, which has been approved by different Lecturers from different higher institutions. We made Preliminary pages, Abstract and Chapter one of "effect of sodium sulphate on engineering properties of laterite soil" visible for everyone, then the complete material on "effect of sodium sulphate on engineering properties of laterite soil" is to be ordered for. Happy viewing!!!


Laterite is one of the major materials used in highway pavement construction. Its properties are affected by some environmental factors which may make it unsuitable for highway pavement construction. This research was aimed at investigated the effect of sodium sulphate ( NaSO4) on engineering properties of  lateritic soil in highway construction.
Laterite soil sample was collected from a burrow pit and it was overdried for about 24hours. The sample was divided in four portions after being properly mixed in laboratory. The first portion was not contaminated with any salt, it serve as a control sample(sample A) while the remaining three portions were contamination with 20kg, 30kg and 40kg of NaSO4 and were labeled D,E, and F respectively. The sample were allowed to stand for 7days before they were subjected to the following laboratory test: particle size analysis, Atterberg limits, Bristish standard compaction and califonia bearing Ratio (CBR) tests.
The result showed that the effect of sodium sulphate solution has strong influence on the engineering properties of the laterite soil when compared with the control soil sample.
The influence caused reduction in the strength of the soil and there by rending it Unsuitable for Civil Engineering construction.

Title Page                                                                                                                       i
Declaration                                                                                                                          ii         
Certification                                                                                                                         iii        
Dedication                                                                                                                            iv
Acknowledgement                                                                                                                        v         
Abstract                                                                                                                                vi
Table Contents                                                                                                                    vi-viii
List of Tables                                                                                                                        ix-x     
List of Figures                                                                                                                      ix
1.0      Introduction                                                                                                                        1-2
1.1      Statement of the Problem                                                                                   2         
1.2      Aim and objective of the Study                                                                          2
1.3      Justification                                                                                                              3         
1.4      Scope of the Study                                                                                                            3         
1.5      Methodology                                                                                                          3-4    
2.0      Literature Review                                                                                                  5-6
2.1      Origin of Laterites                                                                                                  6
2.1.1 Definition of Laterite                                                                                             7
2.1.2              Formation of Laterite                                                                                            7-8
2.1.3  Profiles of Lateritic Soils                                                                                      8
2.1.4 Improvement of Lateritic Soils                                                                           9-10
2.2      Engineering Properities of sLateritic Soils                                                       10
2.2.1  Particle-Size Distribution of Lateritic Soil                                                       10-11
2.2.2  Plasticity Characteristics of Lateritic Soil                                                         11
2.2.3  Compaction Characteristics of Lateritic Soil                                                  12
2.2.4  Shear Strength Characteristics of Lateritic soils                                            12-13
2.3      General uses of Laterites                                                                                     13-14
2.4      Sodium(II) Tetraoxosuphate (VI)  Salt                                                             14
2.4.1  Preparation and Occurrence of NaSO4                                                                              15
2.4.2  Chemical Properties of Sodium(II)Tetraxosulphate (VI) Salt                    15-16
2.4.3  Uses of Sodium(II)Tetraxosulphate(VI) Salt                                                   16
2.4.4 Toxicological Effect of Sodium(II) tetraxosulphate (VI) salt                       16
2.5      Stabilisation                                                                                                             17
2.5.1 Objectives of Stabilization                                                                                   17
2.5.2  Method of Stabilisation                                                                                       17-18

3.0      Methodology                                                                                                          19
3.1      Procurement of materials                                                                                   19
3.2      Collection of Samples                                                                                           19
3.3      Experimental Investigation                                                                                 19
3.3.1  Particle Size Distribution                                                                                     19-20
3.3.2  Atterberg’s Limit Test                                                                                           20-22
3.3.3 Compaction Test                                                                                                    22-23
3.3.4  Califonia Bearing Ratio                                                                                        23-24

4.0      Result Analysis and Discussion                                                                           25
4.1      Particle Size Distribution                                                                                      25-27
4.2      Atterberg Limit Test                                                                                               28-32
4.3      Compaction Test                                                                                                   33-37
4.4      Califonia Bearing                                                                                                   37-41
4.5      Comparison of Result                                                                                            42

5.0       Conclusion                                                                                                              43
5.1      Recommendation                                                                                                  44
                    References                                                                                                      45-46
                APPENDICES A­-E                                                                                                47-51 

Table 4.1:     Result of particle size Distribution                                                         25
Table 4.2.1: Atterberg Table for Sample A                                                                28
Table 4.2.2  Atterberg Table for Sample B                                                                30
Table 4.2.3 Atterberg Table for Sample C                                                                 31
Table 4.2.4  Atterberg Table for Sample D                                                                32
Table 4.3.1:             Compaction Table for Sample A                                                                        33
Table 4.3.2 Compaction Table for Sample B                                                             34
Table 4.3.3:             Compaction Table for Sample C                                                             35
Table 4.3.4: Compaction Table for Sample D                                                           36
Table 4.4.1: CBR Table for Sample A                                                                           37
Table 4.4.2: CBR Table for Sample B                                                                           38
Table 4.4.3:             CBR Table for Sample C                                                                            39
Table 4.4.4:             CBR Table for Sample D                                                                            40
Table 4.5:     Comparison of Result                                                                                42  

Fig 4.1: Grain Size Distribution Curve                                                                        26
Fig 4.2.1: Plastic Limit Graph for Sample A                                                                 28
Fig 4.2.2: Plastic Limit Graph for Sample B                                                                 30
Fig 4.2.3: Plastic Limit Graph for Sample C                                                                 31
Fig 4.2.4: Plastic Limit Graph for Sample D                                                                32
Fig 4.3.1: Compaction Graph for Sample A                                                               33
Fig 4.3.2: Compaction Graph for Sample B                                                                34
Fig 4.3.3: Compaction Graph for Sample C                                                                35
Fig 4.3.4: Compaction Graph for Sample D                                                                36

CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "effect of sodium sulphate on engineering properties of laterite soil" is also available. Order full work to download. Chapter two of "effect of sodium sulphate on engineering properties of laterite soil" consists of the literature review. In this chapter all the related work on "effect of sodium sulphate on engineering properties of laterite soil" was reviewed.

CHAPTER THREE: The complete chapter three of "effect of sodium sulphate on engineering properties of laterite soil" is available. Order full work to download. Chapter three of "effect of sodium sulphate on engineering properties of laterite soil" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.

CHAPTER FOUR: The complete chapter four of "effect of sodium sulphate on engineering properties of laterite soil" is available. Order full work to download. Chapter four of "effect of sodium sulphate on engineering properties of laterite soil" consists of all the test conducted during the work and the result gotten after the whole work

CHAPTER FIVE: The complete chapter five of design and construction of a "effect of sodium sulphate on engineering properties of laterite soil" is available. Order full work to download. Chapter five of "effect of sodium sulphate on engineering properties of laterite soil" consist of conclusion, recommendation and references.



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