This document discusses improving the strength of soil by adding fly ash and polypropylene fiber. Fly ash is a waste product from coal combustion that is beneficial for soil stabilization by improving compressive and shearing strength. Polypropylene fiber also increases soil strength when added. The study aims to enhance the geotechnical properties of clayey soil by replacing it with these industrial wastes. Testing of the native soil found it had a liquid limit of 35%, plastic limit of 8%, and plasticity index of 27%. Standard proctor tests were conducted on soil mixed with varying amounts of fly ash, finding maximum dry density decreased as fly ash percentage increased.

1. Improvement in strength of Soil by adding
Flyash & Polypropylene fibre
Under guidance of :-Amanpreet Tangri Presented by:- Sahil Rana
Asst. prof. Chandigarh University UID:-16MCE1008

2. Introduction
• Soil Stabilization is the alteration of soils to enhance their
physical and engineering properties.
• The existing soil at a particular location may not be
suitable for the construction due to poor bearing capacity
and higher compressibility.
• The present study made an attempt to enhance the
geotechnical properties of a soil replaced with industrial
wastes having pozzolanic value.
• An experimental program undertaken to investigate the
effects of discrete short polypropylene fiber and Fly-ash
on the strength & behavior of clayey soil.
Fig: soil stabilization

3. Fly-ash
• Fly ash is a solid waste product created by the combustion of coal. There are about 151
thermal power plants in India.Produced about 177 (Acc. to ENVIS centre on Fly ash)
million tonnes per year. The disposal of such large quantity of fly ash is indeed a
challenge.
• The beneficial use of fly ash in soil stabilization treatment and other engnneering
applications have been recognized, only 61% (107.75 Million tonnes) of the total fly ash
is being utilized in our country currently in such applications.
• The primary reason fly ash is used in soil stabilization applications is to improve the
compressive and shearing strength of soils.

4. POLYPROPYLENE
• Polypropylene is the world's second-most widely produced
synthetic plastic, after polyethylene.
• The latest report of the market research expects the demand for this
type of plastics to grow by, on average, 3% per year until 2024.
• Stabilizing clayey with polypropylene fiber decreases effect of
swelling percent, in this way the cost will be decreased.
• As the fiber content increased, the unconfined compressive
strength was increased. Finally, it can be said that stabilization of
expansive soils with polypropylene fiber is an effective method.
Fig: Polypropylene fibre

5. Objective of the study:-
• To improve compaction characterstics of soil.
• Enhance strength & bearing capacity .
• To control shrink-swell behaviour of expansive soil.
• Study application of waste material.
• To increase the resistance to erosion, weathering or traffic loading.

6. Material's and Methodology
• In order to conduct this study,various material such as clay soil,Fly-ash and
polypropylene fiber were used.
• Determine water content in soil by performing oven drying test.
• Determine the liquid limit (Using Casagrande apparatus) ,plastic limit(PL) and
plasticity index (LL-PL) of soil.

7. • Standard proctor test were done to assess the amount of campaction.
• Determine the unconfined compressive strength of prepared soil sample.
• Compare all properties of soil when treated with various soil stabilizer.
Continue...

8. Time schedule :-

9. Project Feasibility:
Feasibility study is used to determine the viability of an idea, such as ensuring a project is
legally and technically feasible as well as economically justifiable. One of the many
challenges faced in developing country like India is the issue of waste management. Focus
of this current study is to utilize this waste for engineering purpose.
1. Technical Feasibility –
• Tensile cracking strength of soil is improved.
• Improvements in shrink swell properties of soil.
• Improvement in bearing capacity of soil.
• Reduction in pavement thickness.
• Improvement in compressive strength of soil.etc

10. Continue...
2. Economic Feasibility –
• Waste is minimized.
• Reduction in construction cost.
• Enhance project credibility.
• Reduction in carbon footprint which is important for environmental point of view.

11. Expected Outcomes:
• Improvement in unconfined compressive strength of soil
• Reduction in pavement thickness.
• Improvement in tensile cracking strength of soil for better stability of pavement.

12. Work done till now ...
• Literature Review
• Submission of synopsis
• Review paper writing and publication (in IRJET journal)
• Material collection
• Soil testing

13. Soil
testing
performed
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Oven
drying test
Casagrande
test
Std.
proctor
test

14. Result obtained ...
Casagrande test result :-

15. continue ...
Atterberg’s Limit: -
• Liquid Limit = 35%
• Plastic Limit = 8%
• Plasticity Index = 27%
Pycnometer test result :-
Specific gravity = 2.67
Oven dry test result :-
Moisture content = 17%

16. Standard proctor test result for virgin soil:-
S.N Water % Wt. of
mold +
compact
ed soil
Mass of
compact
ed soil
Bulk
densit
y
Dry
density
1 8 6.080 1.744 1.78 1.65
2 11 6.236 1.930 1.93 1.74
3 14 6.305 1.998 1.99 1.76
4 17 6.255 1.949 1.95 1.67

17. Standard proctor test result for fly ash & soil mix:-
S.N Fly ash
%
Wt. of
mold +
compact
ed soil
Mass of
compact
ed soil
Bulk
densit
y
Dry
density
1 10 6.363 2.057 2.06 1.82
2 20 6.347 2.041 2.05 1.80
3 30 6.310 2.004 2.00 1.76
4 40 6.276 1.970 1.98 1.74
5 50 6.263 1.957 1.96 1.72
The M.D.D and O.M.C of soil-fly ash mix was
determined for different percentages of fly ash.It
is observed that M.D.D decreases with the
increase in flyash percentage & O.M.C remain
constant.

18. THANK YOU!