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IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________________
Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 275
PROPERTIES OF CONCRETE INCORPORATED WITH GGBS
Ishwar Chandra Thakur1, N.Kisku2, J.P.Singh3, Sheo Kumar4
1
M.Tech. Scholar, Structural Engineering, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India
2
Assistant Professor, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India
3
Associate Professor, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India
3
Associate Professor, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India
Abstract
Throughout the world, the most widely used construction material is concrete. It is the second most consumed substance on the
earth after water. As concrete being used for construction of most of the buildings, bridges etc., it has been labelled as the
backbone to the infrastructure development of nation. It is commonly made by mixing Portland cement with sand, crushed rock
and water. It is very clear that among the all components, aggregate and water is largely available material in India at very low
cost. As cement is comparatively high cost it would be advisable to use other locally available industrial and agricultural w aste
material to replace the cement partially. Ground Granulated Blast-furnace Slag (GGBS) is a non-metallic and non-hazardous
waste material of Iron Industry. Therefore the minimization of this waste material without a harmful effect on nature has a vital
importance.The present work focused on the utilization of GGBS in concrete which can be suitably used under the Indian
conditions.For thispurpose, the various tests on properties of green and hardened concrete have been performed. The properties
of green concrete have been analyzed by workability of concrete in terms of slump value whereas the properties of hardened
concrete have been analyzed in terms of mechanical and physical properties of concrete. The mechanical properties of hardened
concrete include the compressive strength, flexural strength and split tensile strength whereas physical properties includesthe dry
& moist density and water absorption of hardened concrete. On the basis of present work we found that GGBS in concrete
improves workability,compressive strength,flexural strength, split tensile strength and decreases the density & water absorption
characteristics of hardened concrete. As a result the cost of concrete decreases. Also GGBS leads to the significant reduction in
the quantity ofcement which enablesthe reduction in CO2 emission and reduction in energy consumption in production of cement.
Keywords: GGBS, cement, fine and coarse aggregate and concrete
----------------------------------------------------------------------***--------------------------------------------------------------------
1. INTRODUCTION
Ground granulated blast furnace slag (GGBS) is a
sustainable material which helps in greener environment by
reducing the energy consumption and carbon dioxide (CO2)
gas emission. Only cement industry accounts for around 5%
global carbon dioxide emissions. It emits CO2 gases both
directly and indirectly. Direct emission of CO2 occurs
through the chemical process called calcination whereas
burning of fossil fuels to heat the kiln indirectly results in
CO2 gas emission. It has been reported that the manufacture
of one tonne of Portland cement would require
approximately 1.5 tonnes of mineral extractions together
with 5000 MJ of energy, and would generate 0.95 tonne of
CO2 equivalent [18]. As GGBS is a by-product of iron
manufacturing industry, it is reported that the production of
one tonne of GGBS would generate only about 0.07 tonne of
CO2 equivalent and consume only about 1300 MJ of energy
[18].
GGBS is obtained from iron manufacturing industries, when
Silicate and aluminate impurities from ore and coke are
combined with flux lowered the viscosity of slag. Molten
iron is then tapped off, the remaining molten slag, which
consists of mainly siliceous and aluminous residue, is then
water-quenched rapidly below 800oC in order to prevent the
crystallization of merwinite and melilite, resulting in the
formation of a glassy granulate. This glassy granulate is then
dried and grounded into fine powder, which is known as
ground granulated blast furnace slag (GGBS). The main
component of blast furnace slag are CaO (30-50%), SiO2
(30-40%), Al2O3 (8 -24%) and MgO (1-18%) which is close
to the chemical composition of portland cement. It is
commonly used in combination with portland cement in
concrete for many applications. Concrete made with GGBS
has many advantages, including improved strength
[5,6,13,16], durability [3,9,13], workability [1,2,19],
economic and environmental benefits [9]. The only
drawback in the use of GGBS concrete is that its strength
development is considerably slower under the standard
curing conditions than that of portland cement concrete,
although the ultimate strength is higher for the same water–
binder ratio [2, 3, 16]. In the construction of large structural
concrete elements where heat dissipation is slow, there can
be a significant rise in temperature within the first few days
after casting due to the exothermic reaction of the binder [4].
The main objective of the present work is to develop a high
performance concrete (HPC) by the use of GGBS.
Therefore, the experimental program has been undertaken
with the objectives to check the compressive, tensile and
flexural strength of concrete grade M30. In addition to this
the density and water absorption characteristics of hardened
concrete was also evaluated. In whole of the experimental
works cement was partially replaced by 10%, 20%, 30%,
40%, 50%, 60% and 70% GGBS.
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________________
Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 276
2. MATERIAL USED
The materials used in experimental investigation include:
2.1 Cement
Ordinary Portland cement of 43-grade conforming to IS:
8112-1989 was used in this project under the brand name
Reliance Cement.
2.2 GGBS
Ground Granulated Blast-furnace Slag (GGBS) used in this
project is the mixed slag from Tata Steel, Jamshedpur and
Electro Steel Chandankyari, Dhanbad, Jharkhand. The
physical & mechanical properties of cement and GGBS are
given in table 1.
Table-1: Physical & mechanical properties of cement&
GGBS
Test Cement GGBS
Color Gray Off white
Consistency 25% 33%
Soundness 4 mm --
Initial setting time 110 minutes --
Final setting time 290 minutes --
Specific gravity 3.13 2.95
Fineness (sieving on 90µm) 8.5 % 0%
Fineness (Blain’s air
permeability)
302 m2/kg 320 m2/kg
Bulk density 1.48 gm/cm3 1.29 gm/cm3
Compressive strength
3days
7days
28 days
N/mm2
23.33
34.33
46.18
--
--
--
Chemical Properties
The test for Chemical Properties of Cement & GGBS has
been performed using X-Ray Fluorescence Machine at ACC
Plant Sindri. The result of which are given in table 2.
Table-2: Chemical Properties of Cement & GGBS
Chemical Composition Cement
%
GGBS
%CaO 63.20 35.27
SiO2 21.06 34.72
Al2O3 5.72 19.11
MgO 1.90 8.46
Fe2O3 4.38 0.5
SO3 2.04 0.18
Na2O 0.25 0.16
K2O 0.87 0.58
Cl 0.01 0.01
TiO2 0.40 0.65
P2O5 0.09 0.01
Mn2O3 0.07 0.14 (MnO)
Glass Content -- 95
2.3 Fine and Coarse Aggregate
The aggregate passing through the sieve size 4.75mm is
termed as fine aggregate and those which retained on 4.75
mm sieve is termed as coarse aggregate. River sand obtained
from Barakar River were used as fine aggregate whereas
mechanically crushed angular coarse aggregate from a
quarry situated in Baliyapur, Dhanbad were used coarse
aggregate. All the properties of aggregates were tested in
accordance with IS: 2386(part I to IV) -1963 and the results
obtained were confirmed with IS 383-1970. Table 3
summarizes the properties of fine and coarse aggregate.
Table-3: Properties of fine and coarse aggregate
Test
Fine
Aggregate
Coarse Aggregate
Zone/type II Crushed angular
Free (surface)
moisture
0.60% 0.20%
Water
Absorption
1.10% 0.45 %
Fineness
Modulus
2.78
7.25(fraction I- 20mm)
6.29(fraction II- 10mm)
Specific gravity 2.62 2.89
Unit
weight(Compact)
1.63gm/cc 1.90gm/cc
Unit
weight(Loose)
1.58gm/cc 1.67gm/cc
2.4 Water
Water which is suitable for drinking is satisfactory for use in
concrete. It was tested and checked for permissible limit as
per the IS: 3025 and IS: 456-2000. Properties of water as
obtained are given in table 4.
Table-4: Properties of water
Solids Result Permissible Limit
Organic 55 mg/l 200 mg/l
Inorganic 1200 mg/l 3000 mg/l
Sulphate(SO3) 75 mg/l 400 mg/l
Chloride (Cl) 1150 mg/l
2000 mg/l for P.C.C.
500 mg/l for R.C.C.
Suspended matter 510 mg/l 2000 mg/l
pH 6.8 > 6
3. EXPERIMENTAL PROCEDURE
Experimental procedure has been described in the following
paragraphs.
3.1 Mix Design
Proportioning of concrete mix for M30 grade of concrete
has been achieved by concrete mix design as per IS
10262:2009. Composition of constituent material per cubic
meter of concrete for different batches is given in table 5.
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________________
Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 277
Table-5: Proportioning of the concrete mix
Mix
Desig
nation
Cem
ent
%
GG
BS
%
Wate
r
(Kg)
Cem
ent
(Kg)
GGB
S
(Kg)
FA
(Kg)
CA
(Kg)
R0 100 0 188 425 0 653 1236
R10 90 10 188 383 42 653 1236
R20 80 20 188 340 85 653 1236
R30 70 30 188 298 127 653 1236
R40 60 40 188 255 170 653 1236
R50 50 50 188 213 212 653 1236
R60 40 60 188 170 255 653 1236
R70 30 70 188 127 298 653 1236
3.3 Mixing Technique
Hand mixing technique has been adopted in the whole
experimental work at temperature of 27° ± 2°C and relative
humidity 90 percent. In each batch 6 specimen of cube of
dimension 150mm x 150mm x 150mm, 6 specimen of
cylinder of dimension 150mm diameter x 300mm height,
and 3 specimen of beam of dimension 100mm x 100mm x
500mm has been made.
3.4 Properties of Fresh Concrete
The property of fresh concrete has been assessed by
workability in terms of slump value. The test of which has
been performed in accordance with IS 1199:1959. The
results of which are given below in table 6.
Table-6: Slump test of concrete
Mix
type
R0 R10 R20 R30 R40 R50 R60 R70
Slump
(mm)
60 63 65 68 70 73 71 67
From above table, it is observed that the slump value of
concrete increases as the percentage of GGBS increases up
to 50% replacement and then decreases. The increase in
slump value is due to the higher smoothness and fineness of
slag increases the entrainment of air in the matrix,
subsequently increasing the volume of paste.
3.5 Properties of Hardened Concrete
Hardened concrete properties have been analyzed in the
terms of compressive, flexural & split tensile strength, dry &
moist density and water absorption. As the development of
strength is time dependent hence these tests has been
performed after a different curing period. One sample each
of cube and cylinder has been tested at 7 and 28 days for
compressive strength and split tensile strength of concrete
respectively while the beam has been tested after curing
period of 28 days for flexural strength of concrete.
Compressive Strength
This test was performed in accordance with IS 516:1959 on
the cube of size 150mm x 150mm x 150mm. The result of
which is given below in table 7.
Table-7: Compressive strength of concrete
Mix
type
7 days 28 days
Avg.
Compressiv
e Strength
(N/mm2)
%
variatio
ns over
R0
Avg.
Compressiv
e Strength
(N/mm2)
%
variations
over R0
R0 26.22 0 38.74 0
R10 25.04 -4.50 40.30 +4.03
R20 24.00 -8.47 41.78 +7.84
R30 23.56 -10.14 43.11 +11.28
R40 23.26 -11.29 47.26 +21.99
R50 22.96 -12.43 49.85 +28.68
R60 21.26 -18.92 47.63 +22.95
R70 19.11 -27.12 44.22 +14.15
Graph showing the variation of compressive strength of
concrete with different percentage of GGBS is presented
below in figure 1.
Fig-1: Compressive strength of concrete
From the above fig., it is observed that compressive strength
of concrete with increasing percentage of GGBS decreases
after 7days but increases after 28 days with optimum
percentage of 50% replacement by GGBS. It indicates the
slower rate of reaction of matrix by incorporation of GGBS.
At optimum percentage of GGBS the compressive strength
is 28.68% higher than that of conventional cement concrete.
Split Tensile Strength
This test was performed in accordance with IS 5816:1999 on
the cylinder of diameter 150mm and height 300mm. The
result of which is given below in table 8.
0
5
10
15
20
25
30
35
40
45
50
R0 R10 R20 R30 R40 R50 R60 R70
Compressivestrength
(N/mm2)
Mix Type
7 days 28 days
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________________
Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 278
Table-8: Split Tensile Strength of concrete
Mix
type
7 days 28 days
Split tensile
Strength
(N/mm2)
%
variation
s over R0
Split tensile
Strength
(N/mm2)
%
variations
over R0
R0 2.64 0.00 2.93 0.00
R10 2.48 -6.25 3.09 +5.64
R20 2.41 -8.93 3.21 +9.68
R30 2.26 -14.29 3.28 +12.10
R40 1.82 -31.25 3.42 +16.94
R50 1.72 -34.82 3.51 +20.16
R60 1.51 -42.86 3.59 +22.58
R70 1.37 -44.76 3.47 +12.21
Graph showing the variation of split tensile strength of
concrete with different percentage of GGBS is presented in
figure 2.
Fig-2: Split tensile strength of concrete
From the fig., it is observed that split tensile strength of
concrete with increasing percentage of GGBS decreases
after 7days but increases after 28days with optimum
percentage of 60% replacement by GGBS. It indicates the
slower rate of reaction of matrix by incorporation of GGBS.
At optimum percentage of GGBS the Split tensile strength is
22.58% higher than that of conventional cement concrete.
Flexural Strength
This test was performed in accordance with IS 516:1959 on
the beam of dimension 100mm x 100mm x 500mm which
were tested at 28 days curing period and average of which
were found out. The result of which is given in table 9.
Table-9: Flexural Strength on concrete
Mix type
28 days
Avg. Flexural
Strength (N/mm2)
% variations over R0
R0 3.87 0.00
R10 4.18 +8.01
R20 4.36 +12.66
R30 4.39 +13.44
R40 4.63 +19.64
R50 4.92 +27.13
R60 4.73 +22.22
R70 4.39 +13.44
Graph showing the variation of flexural strength of concrete
with different percentage of GGBS is given in figure 3.
Fig-3: Flexural strength of concrete
From the graph, it may be observed that the flexural strength
of concrete with increasing percentage of GGBS increases
after 28 days with optimum percentage of 50% replacement
by GGBS. At this stage of replacement of cement with
GGBS flexural strength is 27.13% higher than that of
conventional cement concrete.
Dry and Moist Density
Dry & moist density of concrete has been determined in
accordance with ISO: 6275-1982 and NT BUILD 200. The
value of which are given in table 10.
Table-10: Dry and moist density of hardened concrete
Mix type
Dry Density Moist Density
Avg.
density
(gm/cm3)
%
variation
over R0
Avg.
density
(gm/cm3)
%
variation
over R0
R0 2.71 0.00 2.84 0.00
R10 2.65 -2.41 2.75 -3.14
R20 2.63 -3.09 2.73 -3.83
R30 2.51 -7.63 2.60 -8.41
R40 2.48 -8.57 2.56 -9.59
R50 2.45 -9.72 2.51 -11.62
R60 2.43 -10.31 2.48 -12.43
R70 2.39 -12.10 2.43 -14.36
Graph showing the variation of dry and moist density of
hardened concrete with different percentage of GGBS is
presented in figure 4.
0
1
2
3
4
R0 R10 R20 R30 R40 R50 R60 R70
Splittensilestrength
(N/mm2)
Mix type
7 days 28 days
0
1
2
3
4
5
6
R0 R10 R20 R30 R40 R50 R60 R70
Flexuralstrength(N/mm2)
Mix Type
28 days
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________________
Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 279
Fig-4: Dry and moist density of hardened concrete
From the above fig., it is observed that the dry and moist
density of concrete decreases as the percentage of GGBS
increases. From the above results, it is concluded that the
GGBS can be used to produce the concrete of lower density.
Water Absorption
Water absorption of concrete has been determined in
accordance with ISO: 6275-1982 and NT BUILD 200. The
value of which are given in table 11.
Table-11: Water Absorption of hardened concrete
Mix type Avg. water absorption % % variation over R0
R0 4.50 0.00
R10 3.72 -17.37
R20 3.69 -17.96
R30 3.61 -19.75
R40 3.35 -25.66
R50 2.30 -48.96
R60 2.04 -54.74
R70 1.81 -59.79
Graph showing the variation of water absorption of
hardened concrete with different percentage of GGBS is
presented in figure 5.
Fig-5: Water absorption of hardened concrete
From the above fig., it is observed that the water absorption
of concrete decreases as the percentage of GGBS increases.
From this result, it is concluded that the GGBS can be used
to improve the water impermeability characteristics of
structure. Hence the corrosion of reinforcement may be
retarded & durability of R.C.C. structure may be increased.
3.6 Cost Analysis
Material cost estimation includes cost of water, cement, fine
aggregate and coarse aggregate for a particular design mix.
As per the mix design calculation we obtained that the
weight of water, cement, fine aggregate and coarse
aggregate are 188 kg, 425 kg, 653 kg and 1236 kg
respectively for 1 m3 of dry concrete. As the water is largely
available material in India hence its cost can be neglected.
Present study shows that the replacement of cement by
GGBS can be done as much as 60% (by weight). Analysis
of the cost of concrete with and without GGBS is given
below in table 12.
Table-12: Cost of material per cubic meter of concrete
Item name Rate
Conventional concrete GGBS concrete
% saving
Quantity Cost Quantity Cost
GGBS ₹ 0.50 Per kg --- --- 255 kg ₹ 128
40.82 %
Cement ₹ 400 per bag 8.50 bags ₹ 3400 3.40 bags ₹ 1360
Fine aggregate ₹ 860 per m3 0.249 m3 ₹ 214 0.249 m3 ₹ 214
Coarse aggregate ₹ 2500 per m3 0.428 m3 ₹ 1070 0.428 m3 ₹ 1070
∑=₹ 4684 ∑=₹ 2772
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
R0 R10 R20 R30 R40 R50 R60 R70
Density(gm/cm3)
Mix Type
dry density
moist density
0
1
2
3
4
5
R0 R10 R20 R30 R40 R50 R60 R70
WaterAbsorption%
Mix Type
water absorption
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________________
Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 280
From the above table, we observe that the use of GGBS in
concrete saves money up to 40.82% over the conventional
cement concrete. This is a significant saving of money.
Hence GGBS concrete is more economical.
4. CONCLUSION
1. Slump value of concrete increases as the percentage of
GGBS increases up to 50% replacement and then
decreases. The increase in slump value is due to the
higher smoothness and fineness of slag increases the
entrainment of air in the matrix, subsequently
increasing the volume of paste.
2. Compressive strength of concrete with increasing
percentage of GGBS decreases after 7days but increases
after 28 days with optimum percentage of 50%
replacement by GGBS. It indicates the slower rate of
reaction of matrix by incorporation of GGBS. At
optimum percentage of GGBS the compressive strength
is 28.68% higher than that of conventional cement
concrete.
3. Split tensile strength of concrete with increasing
percentage of GGBS decreases after 7days but increases
after 28days with optimum percentage of 60%
replacement by GGBS. It indicates the slower rate of
reaction of matrix by incorporation of GGBS. At
optimum percentage of GGBS the Split tensile strength
is 22.58% higher than that of conventional cement
concrete.
4. Flexural strength of concrete with increasing percentage
of GGBS increases after 28 days with optimum
percentage of 50% replacement by GGBS. At this stage
of replacement of cement with GGBS flexural strength
is 27.13% higher than that of conventional cement
concrete.
5. Dry and moist density of concrete decreases as the
percentage of GGBS increases. From the above results,
it is concluded that the GGBS can be used to produce
the concrete of lower density.
6. Water absorption of concrete decreases as the
percentage of GGBS increases. From this results, it is
concluded that the GGBS can be used to improve the
water impermeability characteristics of structure.Hence
the corrosion of reinforcement may be retarded &
durability of R.C.C. structure may be increased.
7. Use of GGBS in concrete saves money up to 40.82%
over the conventional cement concrete. This is a
significant saving of money. Hence GGBS concrete is
more economical.
ACKNOWLEDGEMENT
The author is thankful to Dr. V. Pandey, the Head of Civil
Engineering Department, for their valuable suggestion and
encouragement at various stages of the project work. We are
also thankful to Mr. Manoj Kumar Giri, Manager and
Quality Head, ACC Plant Sindri for their guidance and co-
operation to conduct various tests at their modern
technology laboratory.
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IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Properties of concrete incorporated with ggbs

  • 1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________________ Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 275 PROPERTIES OF CONCRETE INCORPORATED WITH GGBS Ishwar Chandra Thakur1, N.Kisku2, J.P.Singh3, Sheo Kumar4 1 M.Tech. Scholar, Structural Engineering, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India 2 Assistant Professor, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India 3 Associate Professor, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India 3 Associate Professor, Civil Engineering Department, B.I.T. Sindri, Jharkhand, India Abstract Throughout the world, the most widely used construction material is concrete. It is the second most consumed substance on the earth after water. As concrete being used for construction of most of the buildings, bridges etc., it has been labelled as the backbone to the infrastructure development of nation. It is commonly made by mixing Portland cement with sand, crushed rock and water. It is very clear that among the all components, aggregate and water is largely available material in India at very low cost. As cement is comparatively high cost it would be advisable to use other locally available industrial and agricultural w aste material to replace the cement partially. Ground Granulated Blast-furnace Slag (GGBS) is a non-metallic and non-hazardous waste material of Iron Industry. Therefore the minimization of this waste material without a harmful effect on nature has a vital importance.The present work focused on the utilization of GGBS in concrete which can be suitably used under the Indian conditions.For thispurpose, the various tests on properties of green and hardened concrete have been performed. The properties of green concrete have been analyzed by workability of concrete in terms of slump value whereas the properties of hardened concrete have been analyzed in terms of mechanical and physical properties of concrete. The mechanical properties of hardened concrete include the compressive strength, flexural strength and split tensile strength whereas physical properties includesthe dry & moist density and water absorption of hardened concrete. On the basis of present work we found that GGBS in concrete improves workability,compressive strength,flexural strength, split tensile strength and decreases the density & water absorption characteristics of hardened concrete. As a result the cost of concrete decreases. Also GGBS leads to the significant reduction in the quantity ofcement which enablesthe reduction in CO2 emission and reduction in energy consumption in production of cement. Keywords: GGBS, cement, fine and coarse aggregate and concrete ----------------------------------------------------------------------***-------------------------------------------------------------------- 1. INTRODUCTION Ground granulated blast furnace slag (GGBS) is a sustainable material which helps in greener environment by reducing the energy consumption and carbon dioxide (CO2) gas emission. Only cement industry accounts for around 5% global carbon dioxide emissions. It emits CO2 gases both directly and indirectly. Direct emission of CO2 occurs through the chemical process called calcination whereas burning of fossil fuels to heat the kiln indirectly results in CO2 gas emission. It has been reported that the manufacture of one tonne of Portland cement would require approximately 1.5 tonnes of mineral extractions together with 5000 MJ of energy, and would generate 0.95 tonne of CO2 equivalent [18]. As GGBS is a by-product of iron manufacturing industry, it is reported that the production of one tonne of GGBS would generate only about 0.07 tonne of CO2 equivalent and consume only about 1300 MJ of energy [18]. GGBS is obtained from iron manufacturing industries, when Silicate and aluminate impurities from ore and coke are combined with flux lowered the viscosity of slag. Molten iron is then tapped off, the remaining molten slag, which consists of mainly siliceous and aluminous residue, is then water-quenched rapidly below 800oC in order to prevent the crystallization of merwinite and melilite, resulting in the formation of a glassy granulate. This glassy granulate is then dried and grounded into fine powder, which is known as ground granulated blast furnace slag (GGBS). The main component of blast furnace slag are CaO (30-50%), SiO2 (30-40%), Al2O3 (8 -24%) and MgO (1-18%) which is close to the chemical composition of portland cement. It is commonly used in combination with portland cement in concrete for many applications. Concrete made with GGBS has many advantages, including improved strength [5,6,13,16], durability [3,9,13], workability [1,2,19], economic and environmental benefits [9]. The only drawback in the use of GGBS concrete is that its strength development is considerably slower under the standard curing conditions than that of portland cement concrete, although the ultimate strength is higher for the same water– binder ratio [2, 3, 16]. In the construction of large structural concrete elements where heat dissipation is slow, there can be a significant rise in temperature within the first few days after casting due to the exothermic reaction of the binder [4]. The main objective of the present work is to develop a high performance concrete (HPC) by the use of GGBS. Therefore, the experimental program has been undertaken with the objectives to check the compressive, tensile and flexural strength of concrete grade M30. In addition to this the density and water absorption characteristics of hardened concrete was also evaluated. In whole of the experimental works cement was partially replaced by 10%, 20%, 30%, 40%, 50%, 60% and 70% GGBS.
  • 2. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________________ Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 276 2. MATERIAL USED The materials used in experimental investigation include: 2.1 Cement Ordinary Portland cement of 43-grade conforming to IS: 8112-1989 was used in this project under the brand name Reliance Cement. 2.2 GGBS Ground Granulated Blast-furnace Slag (GGBS) used in this project is the mixed slag from Tata Steel, Jamshedpur and Electro Steel Chandankyari, Dhanbad, Jharkhand. The physical & mechanical properties of cement and GGBS are given in table 1. Table-1: Physical & mechanical properties of cement& GGBS Test Cement GGBS Color Gray Off white Consistency 25% 33% Soundness 4 mm -- Initial setting time 110 minutes -- Final setting time 290 minutes -- Specific gravity 3.13 2.95 Fineness (sieving on 90µm) 8.5 % 0% Fineness (Blain’s air permeability) 302 m2/kg 320 m2/kg Bulk density 1.48 gm/cm3 1.29 gm/cm3 Compressive strength 3days 7days 28 days N/mm2 23.33 34.33 46.18 -- -- -- Chemical Properties The test for Chemical Properties of Cement & GGBS has been performed using X-Ray Fluorescence Machine at ACC Plant Sindri. The result of which are given in table 2. Table-2: Chemical Properties of Cement & GGBS Chemical Composition Cement % GGBS %CaO 63.20 35.27 SiO2 21.06 34.72 Al2O3 5.72 19.11 MgO 1.90 8.46 Fe2O3 4.38 0.5 SO3 2.04 0.18 Na2O 0.25 0.16 K2O 0.87 0.58 Cl 0.01 0.01 TiO2 0.40 0.65 P2O5 0.09 0.01 Mn2O3 0.07 0.14 (MnO) Glass Content -- 95 2.3 Fine and Coarse Aggregate The aggregate passing through the sieve size 4.75mm is termed as fine aggregate and those which retained on 4.75 mm sieve is termed as coarse aggregate. River sand obtained from Barakar River were used as fine aggregate whereas mechanically crushed angular coarse aggregate from a quarry situated in Baliyapur, Dhanbad were used coarse aggregate. All the properties of aggregates were tested in accordance with IS: 2386(part I to IV) -1963 and the results obtained were confirmed with IS 383-1970. Table 3 summarizes the properties of fine and coarse aggregate. Table-3: Properties of fine and coarse aggregate Test Fine Aggregate Coarse Aggregate Zone/type II Crushed angular Free (surface) moisture 0.60% 0.20% Water Absorption 1.10% 0.45 % Fineness Modulus 2.78 7.25(fraction I- 20mm) 6.29(fraction II- 10mm) Specific gravity 2.62 2.89 Unit weight(Compact) 1.63gm/cc 1.90gm/cc Unit weight(Loose) 1.58gm/cc 1.67gm/cc 2.4 Water Water which is suitable for drinking is satisfactory for use in concrete. It was tested and checked for permissible limit as per the IS: 3025 and IS: 456-2000. Properties of water as obtained are given in table 4. Table-4: Properties of water Solids Result Permissible Limit Organic 55 mg/l 200 mg/l Inorganic 1200 mg/l 3000 mg/l Sulphate(SO3) 75 mg/l 400 mg/l Chloride (Cl) 1150 mg/l 2000 mg/l for P.C.C. 500 mg/l for R.C.C. Suspended matter 510 mg/l 2000 mg/l pH 6.8 > 6 3. EXPERIMENTAL PROCEDURE Experimental procedure has been described in the following paragraphs. 3.1 Mix Design Proportioning of concrete mix for M30 grade of concrete has been achieved by concrete mix design as per IS 10262:2009. Composition of constituent material per cubic meter of concrete for different batches is given in table 5.
  • 3. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________________ Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 277 Table-5: Proportioning of the concrete mix Mix Desig nation Cem ent % GG BS % Wate r (Kg) Cem ent (Kg) GGB S (Kg) FA (Kg) CA (Kg) R0 100 0 188 425 0 653 1236 R10 90 10 188 383 42 653 1236 R20 80 20 188 340 85 653 1236 R30 70 30 188 298 127 653 1236 R40 60 40 188 255 170 653 1236 R50 50 50 188 213 212 653 1236 R60 40 60 188 170 255 653 1236 R70 30 70 188 127 298 653 1236 3.3 Mixing Technique Hand mixing technique has been adopted in the whole experimental work at temperature of 27° ± 2°C and relative humidity 90 percent. In each batch 6 specimen of cube of dimension 150mm x 150mm x 150mm, 6 specimen of cylinder of dimension 150mm diameter x 300mm height, and 3 specimen of beam of dimension 100mm x 100mm x 500mm has been made. 3.4 Properties of Fresh Concrete The property of fresh concrete has been assessed by workability in terms of slump value. The test of which has been performed in accordance with IS 1199:1959. The results of which are given below in table 6. Table-6: Slump test of concrete Mix type R0 R10 R20 R30 R40 R50 R60 R70 Slump (mm) 60 63 65 68 70 73 71 67 From above table, it is observed that the slump value of concrete increases as the percentage of GGBS increases up to 50% replacement and then decreases. The increase in slump value is due to the higher smoothness and fineness of slag increases the entrainment of air in the matrix, subsequently increasing the volume of paste. 3.5 Properties of Hardened Concrete Hardened concrete properties have been analyzed in the terms of compressive, flexural & split tensile strength, dry & moist density and water absorption. As the development of strength is time dependent hence these tests has been performed after a different curing period. One sample each of cube and cylinder has been tested at 7 and 28 days for compressive strength and split tensile strength of concrete respectively while the beam has been tested after curing period of 28 days for flexural strength of concrete. Compressive Strength This test was performed in accordance with IS 516:1959 on the cube of size 150mm x 150mm x 150mm. The result of which is given below in table 7. Table-7: Compressive strength of concrete Mix type 7 days 28 days Avg. Compressiv e Strength (N/mm2) % variatio ns over R0 Avg. Compressiv e Strength (N/mm2) % variations over R0 R0 26.22 0 38.74 0 R10 25.04 -4.50 40.30 +4.03 R20 24.00 -8.47 41.78 +7.84 R30 23.56 -10.14 43.11 +11.28 R40 23.26 -11.29 47.26 +21.99 R50 22.96 -12.43 49.85 +28.68 R60 21.26 -18.92 47.63 +22.95 R70 19.11 -27.12 44.22 +14.15 Graph showing the variation of compressive strength of concrete with different percentage of GGBS is presented below in figure 1. Fig-1: Compressive strength of concrete From the above fig., it is observed that compressive strength of concrete with increasing percentage of GGBS decreases after 7days but increases after 28 days with optimum percentage of 50% replacement by GGBS. It indicates the slower rate of reaction of matrix by incorporation of GGBS. At optimum percentage of GGBS the compressive strength is 28.68% higher than that of conventional cement concrete. Split Tensile Strength This test was performed in accordance with IS 5816:1999 on the cylinder of diameter 150mm and height 300mm. The result of which is given below in table 8. 0 5 10 15 20 25 30 35 40 45 50 R0 R10 R20 R30 R40 R50 R60 R70 Compressivestrength (N/mm2) Mix Type 7 days 28 days
  • 4. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________________ Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 278 Table-8: Split Tensile Strength of concrete Mix type 7 days 28 days Split tensile Strength (N/mm2) % variation s over R0 Split tensile Strength (N/mm2) % variations over R0 R0 2.64 0.00 2.93 0.00 R10 2.48 -6.25 3.09 +5.64 R20 2.41 -8.93 3.21 +9.68 R30 2.26 -14.29 3.28 +12.10 R40 1.82 -31.25 3.42 +16.94 R50 1.72 -34.82 3.51 +20.16 R60 1.51 -42.86 3.59 +22.58 R70 1.37 -44.76 3.47 +12.21 Graph showing the variation of split tensile strength of concrete with different percentage of GGBS is presented in figure 2. Fig-2: Split tensile strength of concrete From the fig., it is observed that split tensile strength of concrete with increasing percentage of GGBS decreases after 7days but increases after 28days with optimum percentage of 60% replacement by GGBS. It indicates the slower rate of reaction of matrix by incorporation of GGBS. At optimum percentage of GGBS the Split tensile strength is 22.58% higher than that of conventional cement concrete. Flexural Strength This test was performed in accordance with IS 516:1959 on the beam of dimension 100mm x 100mm x 500mm which were tested at 28 days curing period and average of which were found out. The result of which is given in table 9. Table-9: Flexural Strength on concrete Mix type 28 days Avg. Flexural Strength (N/mm2) % variations over R0 R0 3.87 0.00 R10 4.18 +8.01 R20 4.36 +12.66 R30 4.39 +13.44 R40 4.63 +19.64 R50 4.92 +27.13 R60 4.73 +22.22 R70 4.39 +13.44 Graph showing the variation of flexural strength of concrete with different percentage of GGBS is given in figure 3. Fig-3: Flexural strength of concrete From the graph, it may be observed that the flexural strength of concrete with increasing percentage of GGBS increases after 28 days with optimum percentage of 50% replacement by GGBS. At this stage of replacement of cement with GGBS flexural strength is 27.13% higher than that of conventional cement concrete. Dry and Moist Density Dry & moist density of concrete has been determined in accordance with ISO: 6275-1982 and NT BUILD 200. The value of which are given in table 10. Table-10: Dry and moist density of hardened concrete Mix type Dry Density Moist Density Avg. density (gm/cm3) % variation over R0 Avg. density (gm/cm3) % variation over R0 R0 2.71 0.00 2.84 0.00 R10 2.65 -2.41 2.75 -3.14 R20 2.63 -3.09 2.73 -3.83 R30 2.51 -7.63 2.60 -8.41 R40 2.48 -8.57 2.56 -9.59 R50 2.45 -9.72 2.51 -11.62 R60 2.43 -10.31 2.48 -12.43 R70 2.39 -12.10 2.43 -14.36 Graph showing the variation of dry and moist density of hardened concrete with different percentage of GGBS is presented in figure 4. 0 1 2 3 4 R0 R10 R20 R30 R40 R50 R60 R70 Splittensilestrength (N/mm2) Mix type 7 days 28 days 0 1 2 3 4 5 6 R0 R10 R20 R30 R40 R50 R60 R70 Flexuralstrength(N/mm2) Mix Type 28 days
  • 5. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________________ Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 279 Fig-4: Dry and moist density of hardened concrete From the above fig., it is observed that the dry and moist density of concrete decreases as the percentage of GGBS increases. From the above results, it is concluded that the GGBS can be used to produce the concrete of lower density. Water Absorption Water absorption of concrete has been determined in accordance with ISO: 6275-1982 and NT BUILD 200. The value of which are given in table 11. Table-11: Water Absorption of hardened concrete Mix type Avg. water absorption % % variation over R0 R0 4.50 0.00 R10 3.72 -17.37 R20 3.69 -17.96 R30 3.61 -19.75 R40 3.35 -25.66 R50 2.30 -48.96 R60 2.04 -54.74 R70 1.81 -59.79 Graph showing the variation of water absorption of hardened concrete with different percentage of GGBS is presented in figure 5. Fig-5: Water absorption of hardened concrete From the above fig., it is observed that the water absorption of concrete decreases as the percentage of GGBS increases. From this result, it is concluded that the GGBS can be used to improve the water impermeability characteristics of structure. Hence the corrosion of reinforcement may be retarded & durability of R.C.C. structure may be increased. 3.6 Cost Analysis Material cost estimation includes cost of water, cement, fine aggregate and coarse aggregate for a particular design mix. As per the mix design calculation we obtained that the weight of water, cement, fine aggregate and coarse aggregate are 188 kg, 425 kg, 653 kg and 1236 kg respectively for 1 m3 of dry concrete. As the water is largely available material in India hence its cost can be neglected. Present study shows that the replacement of cement by GGBS can be done as much as 60% (by weight). Analysis of the cost of concrete with and without GGBS is given below in table 12. Table-12: Cost of material per cubic meter of concrete Item name Rate Conventional concrete GGBS concrete % saving Quantity Cost Quantity Cost GGBS ₹ 0.50 Per kg --- --- 255 kg ₹ 128 40.82 % Cement ₹ 400 per bag 8.50 bags ₹ 3400 3.40 bags ₹ 1360 Fine aggregate ₹ 860 per m3 0.249 m3 ₹ 214 0.249 m3 ₹ 214 Coarse aggregate ₹ 2500 per m3 0.428 m3 ₹ 1070 0.428 m3 ₹ 1070 ∑=₹ 4684 ∑=₹ 2772 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 R0 R10 R20 R30 R40 R50 R60 R70 Density(gm/cm3) Mix Type dry density moist density 0 1 2 3 4 5 R0 R10 R20 R30 R40 R50 R60 R70 WaterAbsorption% Mix Type water absorption
  • 6. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________________ Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 280 From the above table, we observe that the use of GGBS in concrete saves money up to 40.82% over the conventional cement concrete. This is a significant saving of money. Hence GGBS concrete is more economical. 4. CONCLUSION 1. Slump value of concrete increases as the percentage of GGBS increases up to 50% replacement and then decreases. The increase in slump value is due to the higher smoothness and fineness of slag increases the entrainment of air in the matrix, subsequently increasing the volume of paste. 2. Compressive strength of concrete with increasing percentage of GGBS decreases after 7days but increases after 28 days with optimum percentage of 50% replacement by GGBS. It indicates the slower rate of reaction of matrix by incorporation of GGBS. At optimum percentage of GGBS the compressive strength is 28.68% higher than that of conventional cement concrete. 3. Split tensile strength of concrete with increasing percentage of GGBS decreases after 7days but increases after 28days with optimum percentage of 60% replacement by GGBS. It indicates the slower rate of reaction of matrix by incorporation of GGBS. At optimum percentage of GGBS the Split tensile strength is 22.58% higher than that of conventional cement concrete. 4. Flexural strength of concrete with increasing percentage of GGBS increases after 28 days with optimum percentage of 50% replacement by GGBS. At this stage of replacement of cement with GGBS flexural strength is 27.13% higher than that of conventional cement concrete. 5. Dry and moist density of concrete decreases as the percentage of GGBS increases. From the above results, it is concluded that the GGBS can be used to produce the concrete of lower density. 6. Water absorption of concrete decreases as the percentage of GGBS increases. From this results, it is concluded that the GGBS can be used to improve the water impermeability characteristics of structure.Hence the corrosion of reinforcement may be retarded & durability of R.C.C. structure may be increased. 7. Use of GGBS in concrete saves money up to 40.82% over the conventional cement concrete. This is a significant saving of money. Hence GGBS concrete is more economical. ACKNOWLEDGEMENT The author is thankful to Dr. V. Pandey, the Head of Civil Engineering Department, for their valuable suggestion and encouragement at various stages of the project work. We are also thankful to Mr. Manoj Kumar Giri, Manager and Quality Head, ACC Plant Sindri for their guidance and co- operation to conduct various tests at their modern technology laboratory. 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[9] Malhotra, V.M., “Mechanical Properties and Freezing and Thawing Durability of Concrete Incorporating Ground Granulated Blast Furnace Slag,” Canadian Journal of Civil Engineering, V. 16, No. 2, 1989, pp. 140-156 [10] MojtabaValinejad Shoubi, Azin Shakiba Barough and Omidreza Amirsoleimani (2013). “Assessment of the Roles of Various Cement Replacements in Achieving Sustainable and High Performance Concrete”. International Journal of Advances in Engineering and Technology, 6 (1): 68-77. [11] Moir, G. K., and J. S. Lumley. 1989. “Influence of partial cement replacement by ground granulated furnace slag on the expansion of concrete prisms containing reactive aggregate”. In 9th international conference on alkali-aggregate reaction: Proceedings, 199-204. Kyoto, Japan. [12] Neville, A. M., “Properties of Concrete”, 4th Ed., John Wiley and Sons, Inc., pp.665-666 [13] Peter W.C. Leung, and Wong, H.D. (2010). 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  • 7. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________________ Volume: 05 Issue: 08 | Aug-2016, Available @ http://ijret.esatjournals.org 281 [14] Peterson, N.K., and Hale, M., “The Durability, Permeability, and Strength of Concrete Mixtures Containing Ground Granulated Blast Furnace Slag and Fly Ash,” Presentation, ACI National Convent ion, Washington, D.C., 2004. [15] Rose, J. 1987. “The effect of cementitious blast-furnace slag on chloride permeability of concrete”. In ACI special publication SP-102: Corrosion, concrete and chlorides, ed. F. W. Gibson, 107-25. Detroit: American Concrete Institute [16] Shariq, M., Prasad, J., and Ahuja, A.K. (2008). “Strength Development of Cement Mortar and Concrete Incorporating GGBFS”. Asian Journal of Civil Engineering (Building and Housing), 9 (1), 61- 74. [17] Scott A, Alexander MG (2007) the influence of binder type, cracking and cover on corrosion rates of steel in chloride contaminated concrete, Mag concr Res 59(7) : 495-505 [18] S. Arivalagan (2014) “Sustainable Studies on Concrete with GGBS As a Replacement Material in Cement”, Jordan Journal of Civil Engineering, Volume 8, No. 3, 2014 [19] V.S. Tamilarasan, Dr. P. Purumal, Dr. J. Maheswaran “workability study on concrete with GGBS as a replacement material for cement with and without super plasticizer”, International Journal of advanced Research in Engineering & Technology, ISSN 0976- 6480 (print), ISSN 0976-6499(Online) Vol. 3, Number 2, July-December 2012. [20] Wang Ling, Tian Pei, and Yao Yan. (2004). “Application of Ground Granulated Blast Furnace Slag in High- Performance Concrete in China”. International Workshop on Sustainable Development and Concrete Technology, Organized by China Building Materials Academy, PRC, 309-317.