Index and engineering properties of spent wash blended soils a comparative study

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 02 Issue: 10 | Oct-2013, Available @ http://www.ijret.org 194
INDEX AND ENGINEERING PROPERTIES OF SPENT WASH BLENDED
SOILS- A COMPARATIVE STUDY
S. Siva Gowri Prasad1
, V.K.Chakravarthi2
1
Assistant Professor, 2
Associate Professor, Department of Civil Engineering, GMR Institute of technology, AP, India,
gowriprasad.s@gmrit.org, chakravarthi.vk@gmrit.org
Abstract
In the present era of rapid industrialization and development of infrastructure projects, the natural resources are becoming scarce
and hence their cost is increasing alarmingly. For an infrastructural project the soil consumption is very high and also specific soil is
to be used for the requirements of its strength, durability etc. Locally available soil is the best option for these projects, if the suitable
soil is not nearby it has a stringent effect on overall cost of project. Due to increase of demand for land in urban areas, soils which
are weak and not suitable for foundations are to be effectively modified for construction of industries. Hence, there is a need to
carryout research for an alternate material which is available in plenty and also gives desired strength upon modifications. There is a
growing awareness allover the world about the extensive damage caused by the accumulated industrial wastes at various plants. This
paper highlights various issues and scope for utilization of spent wash in engineering practice. This paper presents the results of index
and engineering properties of blended soils. Studies are carried out by varying soil gradation, spent wash content under different
curing time periods. For study two types of soils are taken and their properties are studied up on addition of 25% spent wash
maintaining different curing periods of 2, 4 and 6 weeks. It was observed that spent wash is effective in reducing plasticity
characteristics and increasing engineering properties namely, dry density and the unconfined strength of soil and reducing Optimum
moisture content
Index Terms: Effluent, Tropical, spentwash, blended
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1. INTRODUCTION
Industrialization plays a keen role for developing countries in
uplifting nation’s economy. However, industrialization on the
other hand has also caused serious problems relating to
environmental pollution. Therefore, efforts are to be made for
controlling pollution arising out of the disposal of wastes by
conversion of these unwanted wastes into utilizable raw
materials for various beneficial uses. The present investigation
is intended to study the effect on index and strength properties
of two different soils with an effluent for different periods of
curing. Muthukkumaan.K 2010 [3] investigated the Effect of
Liquid Waste on the Index & Engineering Properties of
Cohesive Soils. Bujang B.K.Haut et al. 2005 [1] investigated
the Effect of Chemical Admixtures on the Engineering
Properties of Tropical Peat Soils. Suriyanarayanan.S et al.
2010 [5], Ratnap.Roy, Jagdish Prasad and A.P.Joshi, 2008 [4]
studied the Characterization and possibilities of Reutilization
of Soild Wastes from a Waste paper based Industry.
Mohammadi A. K 2010 [2] studied the effect of paper mill
sludge on chemical properties of acid soil. These studies
concluded that the effect of effluent on the soil depends on the
type of soil, nature of effluent and time of curing. In this study
two soil samples and one effluent are selected.
2. MATERIALS USED FOR STUDY:
Two types of materials namely soil and spent wash, a waste
product obtained from sugar plant are used for present study.
For the purpose of study two types of sandy soils S-1 and S-2
with varying % fines are collected from srikakulam, Andhra
pradesh India. The samples of soil are collected from depth of
1 to 1.5 m from the ground level. The natural moisture
contents of soil samples were nearly 28.1% and 15.28%
respectively. Disturbed samples were collected and used for
the test.
The spent wash used is an effluent of EID Parys sugar plant,
Sankili, a place 15 km from Rajam, Andhra Pradesh, India.
The sample was collected from equalization pond at a depth of
0.5 m from the surface of the pond and brought to the
laboratory in tightly closed plastic cans. The effluents were
filtered through filter paper to remove the suspended matter.
The chemical constituents of spent wash are presented in
Table: 1
Table-1: Chemical composition of Spent Wash
Name Present(%)
Sucrose 30-35%
Reducing sugar 10-15%

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Ash 10-12%
Total sugar % dry solids 55-60%
Nitrogen 0.15-0.25%
Gums 0.05-3.5%
CaO 1-1.5
SO4 1.2-3.5
P2O5 0.25-0.3
PH 5.4-5.7
3. EXPERIMENTAL STUDY:
Laboratory Tests on spent wash treated soil samples are
conducted for determining the index properties namely
atterberg linits, engineering properties namely compaction
characteristics i.e Optimum Moisture Content( OMC),
Maximum Dry density( MDD) and unconfined compressive
strength (UCS)of soil- spent wash effluent treated soil samples
are determined by blending under different curing time
varying from 2 to 6 weeks.. The blended soil samples are
prepared by maintaining Spent wash at 0 and 25% of dry
weight of soil sample. A comparison of result is carried out
and discussed. The samples after mixing spent wash are
allowed for curing. Testing is carried out as per the procedures
described in BIS
Table-2: Index and engineering properties of soil samples (
0% spent wash)
Soil description
Parameter
Soil1( S1)
Soil2(S2)
Gravel(%) 0 0
Sand(%) 91 96
Fines(%)
(Silt,Clay) 9 4
Bulk Density 1.862 1.777
Water Content 28.1 15.9
Specific Gravity 2.77 2.66
Liquid Limit 55 59
MDD 1.48 1.626
OMC 25.2 19.5
IS Classification Silty Sand Silty Sand
4. PRESENTATION OF RESULTS AND
DISCUSSION:
Naturally available silty sand soil samples S-1 & S-2 with
varying fines were blended with spent wash at 25% of
equivalent weight of soil and tests were conducted. The results
of Index & Engineering properties of soil samples, chemical
properties of spent wash and Engineering properties of
blended soil at different soaking durations (2,4 & 6 weeks)
were determined. The index and engineering properties of the
soil samples S-1 and S-2 with 0% spent wash were presented
in Table-2. Variation of index and engineering properties of
spent wash blended soils with curing time are presented in Fig.
1 to Fig.3.
4.1 Presentation of Results for Index Properties of
Soil Blended with Spent Wash:
Effect of spent wash and curing time on index properties
namely liquid limit, plastic limit and plasticity index is
presented in fig. 1a, 1b and 1c.
20
25
30
35
40
45
50
55
60
65
0 2 4 6 8
Curing Time (Weeks)
LiquidLimit
S-1
S-2
Fig -1a: Influence of curing time on Liquid Limit
0
5
10
15
20
25
30
0 2 4 6 8
Curing Time (Weeks)
PlasticLimit(%)
S-1
S-2
Fig -1b: Influence of curing time on Plastic Limit
0
10
20
30
40
50
0 2 4 6 8
Curing Time (Weeks)
PlasticityIndex(%)
S-1
S-2
Fig -1c: Influence of curing time on Plasticity Index

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From the Fig-1a it is observed that Liquid limit is decreasing
after 2nd week curing period onwards for both the soils. This
may be due to the percentage of water required for blended
samples are gradually decreasing. Similar trend is also
observed for plastic limit for soil sample S-1 as shown in Fig-
1b. In contrast for sample S-2 there is an increase of plastic
limit till 2nd week and later there is a decrease with spent
wash curing time. This may be due to amount of fines present
and change of state from semi solid – plastic state vis-à-vis
volume. However as expected and observed from Fig-1c with
increase of curing time there is a reduction in plasticity index.
This is due to change in liquid limit and plastic limit with
curing time and the plasticity index is numerical difference of
liquid and plastic limits.
4.2 Presentation of OMC-MDD Test Results:
Optimum moisture content and maximum dry density tests
were conducted on soil, spent wash mixtures at a fraction of
25% equivalent weight of soil and the results obtained were
shown in fig-2a and 2b.
4.2.1 Variation of OMC with Spent Wash:
From the fig-2a it was observed that the OMC was reduced
gradually with increase in soaking duration. The behavior can
be attributed due to filling up of voids in soil samples (S-1 &
S-2) by spent wash. This has enhanced density of the soil
under compactive effort resulting reduction in OMC. Spent
wash was effective in reducing optimum moisture content of
soil samples by 46.77% & 20.83% respectively with the
increase in soaking duration from 0 to 6 weeks.
0
5
10
15
20
25
30
0 2 4 6 8
Curing Time (Weeks)
OMC(%)
S-1
S-2
Fig -2a: Influence of curing time on OMC
4.2.2 Variation of MDD With Spent Wash:
1.4
1.45
1.5
1.55
1.6
1.65
1.7
0 2 4 6 8
Curing Time (Weeks)
MDD(g/cc)
S-1
S-2
Fig -2b: Influence of curing time on MDD
From the fig-2b it was observed that the dry density has
increased with curing time. However the increase is rapid for
soil-1 and marginal for soil-2. At 4 weeks curing time for both
soils the MDD has decreased and latter increased with curing
time. This phenomenon can be attributed to the change in void
ratio by addition of spent wash and lubrication effect with
time for samples (S-1 & S-2). Hence effect of compaction on
the mixture increased density up to 7.5% and 2.09% on soil
samples S-1 and S-2 respectively. There is raise in blended
soil from 1.479g/cc at 0 weeks soaking duration to a
maximum of 1.599g/cc at 6 weeks soaking duration.
4.3 Variation of Unconfined Compressive Strength
with Spent Wash:
From the Fig-3 it was observed that the unconfined
compressive strength is initially increased from 0 weeks to
two weeks and latter decreased at 4 weeks soaking duration
and then increased at 6 week duration. Since density has direct
influence on strength and as mentioned in article 4.2, the
variation of strength UCS is the replica of effect caused due to
density change with curing time. The bonding forces in
densified soil due to curing have an influence on strength.
0
0.2
0.4
0.6
0.8
1
0 2 4 6 8
Curing Time (Weeks)
UCS(kg/cm2
)
S-1
S-2
Fig -3: Influence of curing time on unconfined compressive
strength

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CONCLUSIONS
From the tests conducted on two types of spent wash treated
soil samples S-1, S-2 under different curing time for the
variation of index and engineering properties the following
conclusions are derived:
1. The spent wash effectively reduced Liquid Limit up
to 6.90% for S-1 & 55.43% for S-2.
2. The spent wash increased Plastic limit from 25.50%
to 24.00% for S-1 and from 13.705% to 15.33% for
S-2.
3. The spent wash has reduced Plasticity index from
29.41% to 27.37% for S-1 and from 45.065% to
22.48% for S-2.
4. The spent wash was effectively reduced OMC up to
46.77% for S-1 and 20.83% for S-2.
5. The spent wash was effectively increased MDD up to
7.5% for S-1 and 2.09% for S-2.
6. The spent wash was effectively increased the
Unconfined compressive strength up to 27.4% for S-
1 and 84.3% for S-2.
ACKNOWLEDGEMENTS
The authors wishes to express their gratitude to Under
Graduate students P.Laxmi Prasanna, K.G.Charan Kumar,
M.V.Nikhil, Govindu, K.Harika, P.B.Srikanth for their
support in the project work and to GMR institute of
Technology-Rajam, AP, INDIA for the providing necessary
facilities to carry out the project work.
REFERENCES
[1]. Bujang B.K.Haut, Shukri Maail and Thamer Ahmed,
Mohamed 2005 “Effect of Chemical Admixtures on the
Engineering Properties of Tropical Peat Soils” Department of
Civil Engineering, Univesity Putra Malaysia, Serdang,
Selangor, Malaysia.
[2]. Mohammadi A. Torkashvand, 2010 “The effect of paper
mill sludge on chemical properties of acid soil”, Islamic Azad
University-Rasht branch, Rasht, Iran.
[3].Muthukkumaan.K. 2010 “Effect of Liquid Waste on the
Index & Engineering Properties of Cohesive Soils”Indian
Geotechnical Jounral Vol.40, No.3, July
[4]. Ratnap.Roy, Jagdish Prasad and A.P.Joshi, 2008.
“Changes in Soil properties due to irrigation with paper
Industry Wastewater
[5]. Suriyanarayanan.S, A.S.Malilappa, D.Jayakumar,
“Studies on the Characterization and possibilities of
Reutilization of Soild Wastes from a Waste paper based
Industry”
BIOGRAPHIES
Mr SSG Prasad is currently associated with
GMR Institute of Technology, Rajam, AP,
India from 2010. Prior joining he has 7 years
of experience in major Geotechnical
engineering project works. .
Mr. V.K. Chakravarthi, is Currently
Associated with GMR Institute of Technology
as Sr. Associate Professor in Department of
Civil Engineering. He has a total experience
of 18 years in Industry, Research and
academics.

Index and engineering properties of spent wash blended soils a comparative study

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Index and engineering properties of spent wash blended soils a comparative study