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


Dedication iv


Abstract vi

Table Contents vi-viii

List of Tablesix-x

List of Figures ix

1.0 Introduction 1-2

1.1 Statement of the Problem2

1.2 Aim and objective of the Study 2

1.3 Justification3

1.4 Scope of the Study3

1.5 Methodology3-4


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




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