Imperial Journal of Interdisciplinary Research (IJIR)
Vol-2, Issue-12, 2016
ISSN: 2454-1362, http://www.onlinejournal.in
Comparative Study of Lateritic Soil
Using RBI Grade 81
Mr. Anup Gajanan Bombatkar
Mr. Anil Shirsat
Department of Civil Engineering, Subharti Institute of Technology and Engineering, Swami
Vivekanand Subharti University, Meerut, India.
Abstract: As we know expansive soil causing more
number of damages to the structures particularly
light buildings. So, to utilize these soils in an
effective way, it required proper treatment. To
modify engineering properties of Lateritic soil the
same attempt is made. Lateritic soil contains huge
amount of finer particles like medium sand, fine
sand, silt and clay. It is a very homogenous vascular
massive clinker lateritic soils as a group rather than
well defined materials are most commonly found in
leached soils of humid tropic which is enriched in
iron and aluminum. Atterberg’s limit, California
Bearing Ratio (C.B.R.), Unconfined Compressive
Strength (U.C.S.) tests has been carried out on the
samples of soil and soil with stabilizers. Curing of
samples is done for 0,3, days . RBI Grade 81 will be
added to the soil in dry state in percentage (by
weight) varying from 1% to 2% and the tests has
been carried out for lateritic. lateritic soil are such
that they represent a wide range of variation in their
properties.
1. Introduction
To bear the traffic load coming to it the insitu
soil will not be having sufficient strength. Number of
roads are fail due to poor condition of sub grade. If
the insitu soil is made usable through improvement
techniques, this itself will considerably reduce the
cost of pavement construction RBI Grade 81 is
supplied by Legend Surface Developers, New delhi.
They have the license to manufacture it and has
patented it. RBI GRADE 81 is fit for all types of soil.
RBI GRADE 81 reduces the cost of construction by
15-20%. RBI GRADE 81 is environmentally friendly
as compared to other types of stabilizers.
Maintenance is almost nil.
Methodology
•
•
•
Collection of soil samples.
To carry out the tests for virgin soil.
To identify the lacking property soil.
Imperial Journal of Interdisciplinary Research (IJIR)
•
To determine the optimum percentage of RBI
Grade 81 required for stabilization and to
determine the savings in the cost of
construction of pavement.
2. Experimental Investigations
a.
Material used
Soils: The samples of Lateritic soil were taken from
2m depth below the ground surface.
Stabilizer: A Stabilizer given the name as RBI 81
(Road Building International 81) was used to
enhance the Lateritic soil. It is a powder additive
which acts on soil to reduce voids between soil
particles and to minimize absorbed water in the soil
to achieve maximum compaction. The stabilizer is
applied to the natural soil by loose volume and dry
mass of the soil respectively. The properties of RBI
81 are tabulated in Table 1 and chemical
composition of RBI 81 is tabulated in Table 2.
Table1. Properties of RBI 81
Property
Odour
pH
Specific Gravity
Solubility
Freezing Point
Flammability
Description
Odourless
12.5
2.5
In water (0.2 pts/100 pts.)
None, Solid
Non-flammable
b. Chemical Composition of RBI Grade 81
Table 2. Chemical Composition of RBI Grade 81
Properties
Ca
Si
S
Al
Fe
%by Mass
CaO,52-56
SiO2,15-19
SO3,9-11
Al2O3,5-7
Fe2O3,0-2
Page 1348
Imperial Journal of Interdisciplinary Research (IJIR)
Vol-2, Issue-12, 2016
ISSN: 2454-1362, http://www.onlinejournal.in
Mg
Mn,K,Cu,Zn
H 2O
Fibers
Additives
c.
MgO,0-1
Mn+K+Cu+Zn,0.10.3
1-3
0-1
0-4
Basic Tests
The basic tests performed includes test for
Specific Gravity (IS:2720, Part-III), Atterberg’s
limits (IS:2720, Part-V), Compaction characteristics
(IS:2720, Part-VII ), Grain Size distribution
(IS:2720,Part-IV), UCS (IS:2720, Part-X), CBR
(IS:2720 Part- VI). The geotechnical properties of
Lateritic soils tested in the laboratory are tabulated in
Table 3.
Table 3. Properties of Lateritic soil
Sr.No.
1
2
3
4
5
6
7
8
Property
Specific gravity
Grain size distribution (%)
Gravel
Sand
Silt
Clay
Consistency limits (%)
Liquid limit
Plastic limit
Plasticity index
IS soil classification
Maximum dry density (g/cc)
Optimum moisture content
(%)
California bearing ratio (%)
Unconfined compressive
strength (km/m2)
BC Soil
2.5
40.00
25.45
34.78
43.67
34.88
9.18
CL
1.8
17.7
4.2 California bearing test
CBR
1%
of RBI
Grade
81
2%
of RBI
Grade
81
3%
of RBI
Grade
81
4%
of RBI
Grade
81
CBR at 2.5
11.7
12.3
12.99
13.87
mm
penetration
(%)
CBR at 5 mm
10.9
11.18
12.05
12.45
penetration
(%)
4.3 Unconfined compressive strength
% of stabilization
UCS qu(KN/m2) of
Lateritic soil
1
230
2
280
3
320
4
380
4.4 Unconfined compressive strength after curing
% of stabilization
Days
UCS qu(KN/m2)
of Lateritic soil
1
2
3
4
3
3
3
3
290
350
410
490
4. Graph
8.3
150
3. Experiments
3.1 Liquid limit test (water content)
Sample
No.
1
2
3
1% of
RBI
Grade
81
W%
40.80
41.07
40.90
4.1 Plastic limit test
Sample
1% of
No.
RBI
Grade
81
1
32.30
2
32.70
3
31.90
2% of
RBI
Grade
81
W%
38.4
37.69
37.95
2% of
RBI
Grade
81
29.70
29.10
29.20
3% of
RBI
Grade
81
W%
38.2
37.12
38.01
3% of
RBI
Grade
81
28.50
28.10
28.30
4% of
RBI
Grade
81
W%
36.88
35.00
36.74
Fig. 1
4% of
RBI
Grade
81
26.9
27.01
27.90
Imperial Journal of Interdisciplinary Research (IJIR)
Page 1349
Imperial Journal of Interdisciplinary Research (IJIR)
Vol-2, Issue-12, 2016
ISSN: 2454-1362, http://www.onlinejournal.in
Fig.2. Effect of RBI on liquid limit
determine the optimum dosage of RBI grade 81
required is obtained to be 2% for Lateritic soil.
6. Conclusions
•
•
•
Fig.3. Effect of RBI on plastic limit
•
•
•
Lateritic soil have degree of expansion and
possess high swelling potential and require
stabilization for their better performance.
The present work shows 1 to 5% of RBI grade
81 can have a significant effect on the
stabilization of a fine material.
The index parameters of study soils improve
with the addition of RBI grade 81. The liquid
limit decreases from 40.8% to 36.88%.
Plastic limit decreased from 32.8% to 26.9% for
corresponding increase of RBI grade 81 from 0,
1 up to 4%.
The CBR value increases from 1% for 1.7% RBI
grade 81 to 13.87% for 4% RBI grade 81. Any
further increases in addition of % of RBI grade
81 do not increase CBR value.
By using RBI Grade-81 cost reduction in road
pavement is 12.34%.
7. Acknowledgment
Fig.4. Effect of RBI on CBR Test
This paper is an effort from my side to start my
goal of life i.e. “to learn and to teach”. I am grateful
to Project Guide Miss. Shweta Patil and HOD, Mr.
G. N. Narule for the successful completion of project
work from VPCOE Baramati and my project Partner
Mr. Anil Shirsat. I am also thankful to Maharashtra
Institute Technology, Pune to arrange necessary
infrastructure for my paper.
8. References
Fig.5. Effect of RBI on UCS test
5. Result and Discussions
The study of soil characteristics and the analysis
is very important aspect in the design of the
pavement which involves several complexities due to
variable factors. This increase may be due to
cementation and bonding of soil particles. Since RBI
grade 81 acts by hydration reaction, the chemical
reaction is accelerated during soaking. Optimum
dosage value of stabilizer is percent by weight of
stabilizer which when added to soil to increase
strength substantially. Every stabilizer will have an
optimum dosage to be added for each type of soil.
Based on the CBR value an effort was made to
Imperial Journal of Interdisciplinary Research (IJIR)
[1] C M Geiman (2005), “Stabilization of soft
clay sub Grades in Virginia phase I”,
Laboratory study, Master of Science thesis,
Virginia Polytechnic Institute and State
University, Blacksburg.
[2] A U R Shankar, S N Suresha and B
Kashinath (2008), “Characterisation of
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cement”, J. of Indian Highways, IRC, pp.
21-27.
[3] RAASTA Center for Road Technology,
Bangalore.
“Laboratory
studies
on
properties of soils treated with RBI 81
stabilizer”, Report submitted to Legend
Surface Developers Pvt. Ltd, New Delhi
[4] K R Anitha, R Ashalatha and A S Johnson
(2009), “Effects of RBI Grade Different
Types of Sub grade Soil”, Proc. 10th
National Conference on Technological
Trends (NCTT09), India.
Page 1350
Imperial Journal of Interdisciplinary Research (IJIR)
Vol-2, Issue-12, 2016
ISSN: 2454-1362, http://www.onlinejournal.in
[5] S Bhuyan (2010), “Stabilization of Blast
furnace slag and fly ash using lime and RBI
Grade 81”, Bachelor of Technology thesis,
National Institute of Technology, Rourkela.
[6] Biju, P. B., (2003), “Studies on Soil
Stabilization
Using
TerraZyme
for
Pavement Sub grade”, M.Tech Thesis,
University of Kerala, Trivandrum.
[7] Mamta, Mallikarjun.Honna, “Using RBI
Grade 81 a comparative study of Black
Cotton Soil and Lateritic Soil” BKIT
Bhalki, Karnataka.
Imperial Journal of Interdisciplinary Research (IJIR)
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