Strength characteristic of expansive soil admixed with fly ash and lime

1. INFLUENCE OF LIME ON STRENGTH AND
COMPRESSIBILITY CHARACTERISTIC OF
EXPANSIVE SOIL STABILIZED WITH FLY ASH
By
NABAM BUDH
ROLL NO. MT/12/GTE/01
Under the guidance of
Dr. M. Hussain
DEPARTMENT OF CIVIL ENGINEERING
NORTH ESTERN REGIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY
NIRJULI, ARUNACHAL PRADESH 791109

2. OBJECTIVES OF STUDY
 To determine the basic properties of the given Expansive soil.
 To know the amount of Flyash and Lime to stabilize the
Expansive soil.
 To increase the stability and strength of the Expansive soil.
 Reduce the construction cost by making best use of locally
available materials.

3. CONCEPT OF WORK
Expansive
Soil
Fly Ash
Lime

4. SOIL- LIME MECHANISM

6. LITERATURE REVIEW

7. MATERIALS AND METHODS
MATERIALS METHODS
 SOIL
 FLY ASH
 LIME
 COMPACTION TEST
 TRIAL AXIAL TEST
 CONSOLIDATION TEST

8. Property Expansive soil Fly ash Lime
Liquid Limit (%) 130 23 -
Plastic Limit (%) 47.95 - -
Plasticity Index (%) 82.05 NP -
Shrinkage Limit (%) 16.21 - -
Specific Gravity 2.66 2.34 3.3
Gravel (%) (˃ 4.75 mm) 0 0 -
Sand (%) (4.75-0.075) 3.41 10.63 -
Silt (%) (0.075-0.002) 36.59 88.36 -
Clay (%) (˂0.002 mm) 60 1 -
Free Swell Index (ml/gm) 19.67 1 -
MDD (kN/m3) 13.930 12.409 -
OMC (%) 31.657 26.88 -
USCS Classification CH Non-plastic -
Properties of Expansive soil, Fly ash & Lime

9. EFFECT OF FLY ASH ON COMPACTION CHARACTERISTIC
OF EXPANSIVE SOIL
11
12
13
14
15
16
15 20 25 30 35 40
Drydensity(kN/m3)
Moisture content (%)
0 % Fly ash
10% Fly ash
20% Fly ash
100 % Fly ash

10. 13.5
14
14.5
15
0 2 4 6 8 10 12 14 16 18 20 22
Maximumdrydensity(kN/m3)
Fly ash content (%)
28
28.5
29
29.5
30
30.5
31
31.5
32
0 2 4 6 8 10 12 14 16 18 20 22
Optimummoisturecontent(%)
Fly ash content (%)

11. EFFECT OF FLY ASH AND LIME ON COMPACTION
CHARACTERISTIC OF EXPANSIVE SOIL
11
11.5
12
12.5
13
13.5
14
14.5
15 20 25 30 35 40 45 50
Drydensity(kN/m3)
Moisture content (%)
0 % Lime
1 % Lime
3 % Lime
5% Lime
9 % Lime

12. Maximum dry density versus lime (%) at different
percentage of fly ash
11.8
12
12.2
12.4
12.6
12.8
13
13.2
13.4
13.6
13.8
14
14.2
14.4
14.6
0 1 2 3 4 5 6 7 8 9 10
Maximumdrydensity(kN/m3)
Lime content (%)
0 % FA
10 % FA
20 % FA

13. Optimum moisture content (%) versus lime (%) at
different percentage of fly ash
27
29
31
33
35
37
39
41
43
0 1 2 3 4 5 6 7 8 9 10
Optimummoisturecontent(%)
Lime content (%)
0 % FA
10 % FA
20 % FA

14. Peak strength envelopes of expansive soil
treated with lime and fly ash
0
100
200
300
400
500
600
700
0 100 200 300 400 500 600 700 800 900
q
p
100 ES
100 ES + 1 Lime
100 ES + 3 Lime
100 ES + 5 Lime
100 ES + 9 Lime

15. 0
100
200
300
400
500
600
700
0 100 200 300 400 500 600 700 800 900
q
P
90 ES +10 FA
90 ES +10 FA +1 lime
90 ES + 10 FA + 3 Lime
90 ES + 10 FA + 5 Lime
90 ES + 10 FA + 9 Lime

16. 0
100
200
300
400
500
600
700
800
0 200 400 600 800 1000
q(kPa)
p (kPa)
80 ES + 20 FA
80 ES + 20 FA + 1 Lime
80 ES + 20 FA + 3 Lime
80 ES + 20 FA + 5 Lime
80 ES + 20 FA + 9 Lime

17. INFLUENCE OF LIME ON STRENGTH CHARACTERISTICS
OF EXPNSIVE SOIL STABILISED WITH FLY ASH
40
60
80
100
120
140
160
180
0 1 2 3 4 5 6 7 8 9 10
Cohesion(C)(kN/m2)
Lime content (%)
100 ES
90 ES + 10
FA
80 ES + 20
FA
10
15
20
25
30
35
40
45
50
0 1 2 3 4 5 6 7 8 9 10
Angleofinternalfriction(Φ°) Lime content (%)
100 ES
90 ES + 10 FA
80 ES + 20 FA

18. Consolidation Test
Work on Progress

19. CONCLUSION
 Addition of fly ash to the expansive soil decreases the plasticity characteristics of
expansive soil that indicate that the workability of the expansive soil is
improved.
 The dry density of the expansive soil- fly ash mixes increases with an increase in
fly ash content, whereas optimum moisture content of expansive soil fly ash
mixes decreases with an increase in fly ash content.
 The dry density of the expansive soil-fly ash- lime mixes decreases with an
increase in fly ash and lime content, whereas optimum moisture content of
expansive soil fly ash-lime mixes increases with an increase in fly ash and lime
content.
 It has been observed that by increasing fly ash and lime content the peak friction
angle increase and cohesion intercept increases and then decreases.
 With the addition of fly ash and lime the cohesion of the soil increases and then
decreases and angle of internal friction increases.
 The optimum fly ash content is found to be 10 % and 3% and 5% lime content
respectively for ES and ES-FA- lime mixes.

22. References
1. Kumar Arvind, Walia Singh Baljit and Bajaj Asheet, “Influence of Fly Ash, Lime,
and Polyester Fibers on Compaction and Strength Properties of Expansive Soil”
2. Kaniraj R. Shenbaga and Havanagi G. Vasant, “ Behaviour of Cement-Stabilized
Fiber-Reinforced Fly Ash-Soil Mixtures”.
3. Kumar Parveen, Mehndiratta C. H., Chandranarayana S, Singh P. S, “Effect of
Randomly Disrubuted Fibres on Fly Ash Embankments”.
4. J.S. Dhanya & K. Ilamparuthi, “Stress-Strain Response of Fiber Reinforced
Admixed Soil”.
5. A.K. Choudhary et. al. (2012) “Improvement in CBR of the Expansive Soil
Subgrades with a Single Reinforcement Layer”.
6. J. Maity et. al. (2012), “Effect of Random mixing of Natural Fibers for the
improvement of Clayey Soil in subgrade construction in roads”.
7. S. Bhuvaneshwari, R. G. Robinson & S. R. Gandhi (2005), “Stabilization of
Expansive Soils Using Flyash”.
8. Anand J. Puppala et al (2006), “Volume Change behaviors of Expansive Soils
Stabilized with Recycled Ashes and Fibers”.
9. S. Banu Ikizler , Mustafa Aytekin & Halil İbrahim Yavuz (2009), “Effect of fibers on
swelling characteristics of bentonite”.
10. A. Chegenizadeh & H.R. Nikraz (2011), “Investigation on shrinkage behaviour of
Kaolin clay”.