This document discusses a project to study the use of fly ash for soil stabilization. The objectives are to identify the local soil type, analyze its properties, determine the optimum moisture content, and compare the properties with and without fly ash addition. The methodology involves collecting soil samples, conducting tests like proctor compaction and CBR to establish baseline properties, adding varying amounts of fly ash, and re-testing after curing to find the optimum fly ash dosage. The literature review covers previous studies analyzing improvements to soil strength and compressibility from fly ash addition. The expected outcomes are a better understanding of soil stabilization methods and identification of additional materials to further boost soil strength.

1. SOIL STABILIZATION USING
FLY ASH
TEAM MEMBERS
HARIKRISHNAN P A
DHANUSH KRISHNA
AKBAR BASHEER
FARZAN AZEEZ

2.  IDENTIFYING THE TYPE OF THE SOIL
 ANALYZING THE PROPERTIES OF THE SOIL AT THE
AREA
 FINDING OPTIMUM MOISTURE CONTENT
 COMPARING THE PROPERTIES WITH AND WITHOUT
FLY ASH
 FINDING THE OPTIMUM DOSAGE OF FLY ASH
Objectives

3.  Karthik.S , Ashok kumar , Gowtham. , Elango.G , Gokul.D ,
Thangaraj.S” Soil Stabilization By Using Fly Ash”. They have
studied the properties of Red soil by adding different
percentages of fly ash and came to the conclusion that
maximum bearing capacity is obtained at 6% fly ash. They also
found an increase in CBR value and hence can provide a less
thickness for the subgrade.
 S. Bhuvaneshwari R. G. Robinson S. R. Gandhi “ Stabilization of
expansive soils using flyash ”. This paper describes a study carried
out to check the improvements in the properties of expansive soil
with fly ash in varying percentages. Both laboratory trials and field
tests have been carried out and results are reported in this paper.
One of the major difficulties in field application is thorough mixing
of the two materials (expansive soil and fly ash) in required
proportion to form a homogeneous mass. The paper describes a
method adopted for placing these materials in layers of required
thickness and operating a “Disc Harrow”.
Literature Review

4.  Anil Kumar Singhai , Sudhanshu Shekhar Singh. “LABORATORY STUDY ON SOIL
STABILIZATION USING FLY ASH AND RICE HUSK ASH”. This paper studied the
effect of Fly Ash and Rice husk ash to improve the performance of black cotton
soil. In this paper black cotton soil is treated with fly ash (5%,10%,15%,20%,25%)
and rice husk ash (10%,15%,20%,25%,30%) and examined after 28 days of curing.
 Saifuddin Ahmad, S.M. Ashraf Husain, Sabih Ahmad.”Stabilization of Low
Shear Strength Soil by using Fly Ash”. It is an investigation to evaluate the
compaction and unconfined compressive strength of cohesive soil by using Fly
Ash Mixtures. Some expecting properties to be improved such as shear
strength of soil by the mixing of Fly Ash on different varying percentage of Fly
Ash. It was found that the maximum shear strength is increased by 4 percent
when 10 per cent of fly ash by weight is mixed in soil and no remarkable change
in internal friction.
Literature Review: Contd.

5.  Fly ash can provide an array of divalent and trivalent
cations (Ca2+,Al3+,Fe3+etc) under ionized conditions
that can promote flocculation of dispersed clay
particles by cation exchange process.
 The stabilizing action is due to the combined action of
additional silt size particles to some extent and due to
chemical reactions that cause immediate flocculation
of clay particles.
Principle of soil stabilisation

6.  The soil sample is collected
 The soil type is identified
 Sieving and drying is done
 Proctor test is done to find the OMC
 Specific gravity of the soil is found
 Attenberg’s limit is found
 CBR Test is conducted in the soaked and un-soaked
condition
 Unconfined compressive strength is also done
METHODOLOGY

7.  The property of the soil that is to be improved is fixed
 Fly Ash (FA) is collected and its properties are
identified
 FA is added in soil in varying percentages from (0 to
25) and all the properties of the mix is found out in 7
days and 28 days.
 The percentage giving the desired properties is the
optimum dosage of fly ash.
METHODOLGY (contd.)

8.  An insight into the different methods of soil
stabilization
 Thorough understating of different tests conducted on
soil.
 Finding additional materials that can further increase
the strength
Expected Outcomes

9.  THE WORK IS EXPECTED TO BE COMPLETED BY THE
10th of November.
 WE HAVE COLLECTED THE FLY ASH SAMPLE FROM
LEXMAN AND Co. Ready Mix Plant.
TIMELINE