Journal of International Academic Research for Multidisciplinary
ISSN 2320 -5083
A Scholarly, Peer Reviewed, Monthly, Open Access, Online Research Journal
Impact Factor – 1.393
VOLUME 1 ISSUE 10 NOVEMBER 2013
A GLOBAL SOCIETY FOR MULTIDISCIPLINARY RESEARCH
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Editorial Board
Dr. Kari Jabbour, Ph.D Curriculum Developer, American College of Technology, Missouri, USA.
Er.Chandramohan, M.S System Specialist - OGP ABB Australia Pvt. Ltd., Australia.
Dr. S.K. Singh Chief Scientist Advanced Materials Technology Department Institute of Minerals & Materials Technology Bhubaneswar, India
Dr. Jake M. Laguador Director, Research and Statistics Center, Lyceum of the Philippines University, Philippines.
Prof. Dr. Sharath Babu, LLM Ph.D Dean. Faculty of Law, Karnatak University Dharwad, Karnataka, India
Dr.S.M Kadri, MBBS, MPH/ICHD, FFP Fellow, Public Health Foundation of India Epidemiologist Division of Epidemiology and Public Health, Kashmir, India
Dr.Bhumika Talwar, BDS Research Officer State Institute of Health & Family Welfare Jaipur, India
Dr. Tej Pratap Mall Ph.D Head, Postgraduate Department of Botany, Kisan P.G. College, Bahraich, India.
Dr. Arup Kanti Konar, Ph.D Associate Professor of Economics Achhruram, Memorial College, SKB University, Jhalda,Purulia, West Bengal. India
Dr. S.Raja Ph.D Research Associate, Madras Research Center of CMFR , Indian Council of Agricultural Research, Chennai, India
Dr. Vijay Pithadia, Ph.D, Director - Sri Aurobindo Institute of Management Rajkot, India.
Er. R. Bhuvanewari Devi M. Tech, MCIHT Highway Engineer, Infrastructure, Ramboll, Abu Dhabi, UAE Sanda Maican, Ph.D. Senior Researcher, Department of Ecology, Taxonomy and Nature Conservation Institute of Biology of the Romanian Academy, Bucharest, Romania Dr. Reynalda B. Garcia Professor, Graduate School & College of Education, Arts and Sciences Lyceum of the Philippines University Philippines Dr.Damarla Bala Venkata Ramana Senior Scientist Central Research Institute for Dryland Agriculture (CRIDA) Hyderabad, A.P, India PROF. Dr.S.V.Kshirsagar, M.B.B.S,M.S Head - Department of Anatomy, Bidar Institute of Medical Sciences, Karnataka, India. Dr Asifa Nazir, M.B.B.S, MD, Assistant Professor, Dept of Microbiology Government Medical College, Srinagar, India. Dr.AmitaPuri, Ph.D Officiating Principal Army Inst. Of Education New Delhi, India Dr. Shobana Nelasco Ph.D Associate Professor, Fellow of Indian Council of Social Science Research (On Deputation}, Department of Economics, Bharathidasan University, Trichirappalli. India M. Suresh Kumar, PHD Assistant Manager, Godrej Security Solution, India. Dr.T.Chandrasekarayya,Ph.D Assistant Professor, Dept Of Population Studies & Social Work, S.V.University, Tirupati, India.
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EFFECTS OF THE USAGE OF FLY ASH AS PARTIAL REPLACEMENT OF CEMENT ON THE MECHANICAL PROPERTIES OF CONCRETE
JAYESHKUMAR PITRODA*
DR. L.B.ZALA** DR.F.S.UMRIGAR***
*Assistant Professor & Research Scholar, Dept. of Civil Engineering, B.V.M. Engineering College, Vallabh Vidhyanagar, Gujarat, India
**Head & Professor, Dept. of Civil Engineering, B.V.M. Engineering College, Vallabh Vidhyanagar, Gujarat, India ***Principal, B.V.M. Engineering College, Vallabh Vidhyanagar, Gujarat, India
ABSTRACT The fly ash is a residue resulting from combustion of pulverized coal in thermal power plants.
The utilization of thermal industry waste fly ash (Class-F) can reduce the consumption of
natural resources, reduce the quantity of expensive cement, reduce environmental pollution
and make cement concrete structures denser and thus improve their durability. In recent
years, many researchers have established that the use of supplementary cementitious
materials (SCMs) like fly ash, blast furnace slag, silica fume, metakaolin, rice husk ash and
hypo sludge etc. can, not only improve the various properties of concrete - both in its fresh
and hardened states, but also can contribute to economy in construction costs. This research
work describes the feasibility of using the fly ash (Class-F) in concrete production as partial
replacement of cement by weight. The use of fly ash in concrete formulations as a
supplementary cementitious material was tested as an alternative to conventional concrete.
The cement has been replaced by fly ash accordingly in the range of 0% (without fly ash),
10%, 20%, 30% and 40% by weight of cement for M-25 and M-40 mix. Concrete mixtures
were produced, tested and compared in terms of compressive and split strength to the
conventional concrete. These tests were carried out to evaluate the mechanical properties for
the test results for compressive strength up to 90 days and split strength for 90 days are taken. KEY WORDS: Fly Ash, Compressive Strength, Split Strength, Supplementary Cementitious Materials, Cost INTRODUCTION Incorporating fly ashes in cementitious systems is nowadays considered a common
practice in the construction industries. However, the fly ash quantities that are produced
globally are steadily increasing, exceeding the utilization rates that in most countries remain
low. Modern concrete often includes the use of supplementary cementitious materials
(SCM).These materials are often co-products of other processes or natural materials. Some
require further processing before they are suitable for concrete. fly ash is the most common
SCMs used in concrete. Most concrete produced today includes these materials. For this
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reason their properties are frequently compared to each other by mix designers seeking to
optimize concrete mixtures.
The burning of harder, older anthracite and bituminous coal typically produces Class F fly
ash. This fly ash is pozzolanic in nature, and contains less than 20% lime (CaO). Possessing
pozzolanic properties, the glassy silica and alumina of Class F fly ash requires a cementing
agent, such as Portland cement, quicklime, or hydrated lime, with the presence of water in
order to react and produce cementitious compounds. Alternatively, the additions of a
chemical activator such as sodium silicate to a Class F ash can lead to the formation of a
geopolymer.
Fly ash is the finely divided mineral residue resulting from the combustion of ground or
powdered coal in electric power generating thermal plant. Fly ash is a beneficial mineral
admixture for concrete. The hydration reactions are similar to the reactions occurring during
the hydration of Ordinary Portland Cement. Thus, concrete containing Fly Ash pozzolan
becomes denser, stronger and generally more durable long term as compared to straight
Ordinary Portland Cement concrete mixtures.
The present day world is witnessing the construction of very challenging and aesthetic
structures. Fly Ash is economical. The cost of Fly Ash is generally less than Ordinary
Portland Cement depending on transportation. Significant quantities may be substituted for
Ordinary Portland Cement in concrete mixtures and yet increase the long term strength and
durability. Thus, the use of Fly Ash may impart considerable benefits to the concrete mixture
over a plain concrete for less cost. There are main reasons to use fly ash in concrete:
Reducing cost of concrete production, Improve the quality of fresh and hardened concrete,
Extend the concrete lifetime. In the present experimental investigation on effects of the usage
of fly ash as partial replacement of cement on the mechanical properties of concrete on M25
and M40 grades of concrete.
DESIGN MIX MATERIALS
a) Supplementary cementitious material: Fly Ash
Fly ash is composed of the non-combustible mineral portion of coal. Particles are glassy,
spherical ‘ball bearings’ finer than cement particles. Sizes of particle are 0.1µm-150 µm. It is
a pozzolonic material which reacts with the free lime in the presence of water, converted into
calcium silicate hydrate (C-S-H) which is the strongest and durable portion of the post in
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concrete. The fly ash is procured from Maize Products (A division of Sayaji Industries Ltd)
Power plant. This plant is located near kathwada in Ahmedabad District in Gujarat State.
b) Cement
The most common cement used is an Ordinary Portland Cement (OPC). The Ordinary
Portland Cement of 53 grades conforming to IS:8112-1989 is used. Many tests were
conducted on cement; some of them are specific gravity, consistency tests, setting time tests,
compressive strengths, etc.
TABLE 1 PROPERTIES OF ORDINARY PORTLAND CEMENT 53 GRADES
Sr. No.
Physical properties of cement Result Requirements as per IS:8112-1989
1 Specific gravity 3.15 3.10-3.15 2 Standard consistency (%) 28% 30-35
3 Initial setting time (hours, min) 35 min 30 minimum 4 Final setting time (hours, min) 178 min 600 maximum
5 Compressive strength- 7 days 38.49 N/mm2 43 N/mm2 6 Compressive strength- 28 days 52.31 N/mm2 53 N/mm2
c) Aggregate
Aggregates are the important constituents in concrete. They give body to the concrete,
reduce shrinkage and effect economy. One of the most important factors for producing
workable concrete is a good gradation of aggregates. Good grading implies that a sample
fractions of aggregates in required proportion such that the sample contains minimum voids.
Samples of the well graded aggregate containing minimum voids require minimum paste to
fill up the voids in the aggregates. Minimum paste means less quantity of cement and less
water, which is further mean increased economy, lower shrinkage and greater durability.
d) Coarse Aggregate
The fractions from 20 mm to 4.75 mm are used as coarse aggregate. The Coarse Aggregates
from crushed Basalt rock, conforming to IS: 383 are used. The Flakiness Index and
Elongation Index were maintained well below 15%.
e) Fine aggregate
Those fractions from 4.75 mm to 150 microns are termed as fine aggregate. The river
sand and crushed sand are used in combination as fine aggregate conforming to the
requirements of IS: 383. The river sand is washed and screened, to eliminate deleterious
materials and oversize particles.
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TABLE 2 PROPERTIES OF AGGREGATES
Property Fine Aggregate Coarse Aggregate 20 mm down 10 mm down
Fineness modulus 3.35 7.54 3.19 Specific Gravity 2.38 2.76 2.69 Water absorption (%) 1.20 1.83 1.35 Bulk Density (gm/cc) 1753 1741 1711
f) Water
Water is an important ingredient of concrete as it actually participates in the chemical
reaction with cement. Since it helps to from the strength giving cement gel, the quantity and
quality of water are required to be looked into very carefully. Water cement ratio used is 0.50
for M25 and 0.38 for M40 concretes.
DESIGN MIX METHODOLOGY
a) Design Mix
A mix M25 and M40 grade were designed as per IS 10262:2009 and the same was used to
prepare the test samples. The design mix proportion is shown in Table 3
TABLE 3 CONCRETE DESIGN MIX PROPORTIONS
Sr.No.
Concrete Mix
Concrete Design Mix Proportion (By Weight in kg)
Cement Replacement
by Fly ash
W/ C ratio
C F. A. C. A.
1 A1 0.50 372.00 558.60 1251.90 - 2 B1 0.50 334.80 558.60 1251.90 37.20 3 B2 0.50 297.60 558.60 1251.90 74.40 4 B3 0.50 260.40 558.60 1251.90 111.60 5 B4 0.50 223.20 558.60 1251.90 148.80 6 A2 0.38 473.68 341.91 1419.30 - 7 B5 0.38 426.31 341.91 1419.30 47.37 8 B6 0.38 378.94 341.91 1419.30 94.74 9 B7 0.38 331.58 341.91 1419.30 142.10 10 B8 0.38 284.21 341.91 1419.30 189.47
W/C = Water/Cement, C= Cement, F. A. = Fine Aggregate, C. A. = Coarse Aggregate
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b) Compression and Split Test
Standard metallic cube moulds (150*150*150 mm) were casted for compressive and split
strength. A table vibrator was used for compaction of the hand filled concrete cubes. The
specimens were demoulded after 24 hours and subsequently immersed in water for different
age of testing. For each age three specimens were tested for the determination of average
compressive and split strength. The test was performed on compression testing machine
having capacity of 200 MT. Figure 1and2 shows the setup of compressive and split strength
testing machine.
Fig.1. Setup of Compressive Strength Test
Fig.2. Setup of Split Strength Test
RESULTS
Thecompressive strength results are compiled in Table-4 and split strength in Table-5. The
compressive strength v/s % replacements of cement results are graphically shown in figure 3
and 4. The same for split strength is in figure 5 and 6.
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TABLE 4 COMPRESSIVE STRENGTH AND % CHANGE OF STRENGTH AT 7, 14, 28, 56 AND 90 DAYS FOR M25 AND M40 Concrete
Mix
Average Compressive Strength at % Change in Compressive Strength at
7days
[N/mm2]
14 days
[N/mm2]
28 days
[N/mm2]
56 days
[N/mm2]
90 days
[N/mm2]
7
days
14
days
28
days
56
days
90
days
A1 28.76 32.00 38.52 40.30 42.52 0 0 0 0 0
B1 21.33 30.90 34.67 35.41 36.30 (-) 25.83 (-) 3.43 (-) 9.99 (-) 12.13 (-)14.62
B2 16.15 23.78 24.30 25.63 26.07 (-) 43.84 (-) 25.68 (-) 36.91 (-) 36.40 (-) 38.68
B3 13.04 15.11 22.37 23.26 24.74 (-) 54.65 (-) 52.78 (-) 41.92 (-) 42.28 (-) 41.81
B4 9.93 14.81 17.33 22.22 23.56 (-) 65.47 (-) 53.71 (-) 55.00 (-) 44.86 (-) 44.59
A2 34.81 45.04 50.81 52.89 53.93 0 0 0 0 0
B5 29.33 34.96 38.22 40.74 42.52 (-) 15.74 (-) 22.38 (-) 24.77 (-) 22.97 (-) 21.15
B6 23.79 25.48 27.70 30.81 33.78 (-) 31.65 (-) 43.42 (-) 45.48 (-) 41.74 (-) 37.36
B7 18.10 18.37 22.52 25.48 26.52 (-) 48.00 (-) 59.21 (-) 55.67 (-) 51.82 (-) 50.82
B8 14.61 16.44 21.63 23.70 25.33 (-) 58.02 (-) 63.49 (-) 57.42 (-) 55.19 (-) 53.03
28.7621.33 16.15 13.04 9.93
32.00 30.9023.78 15.11 14.81
38.52 34.6724.30 22.37 17.33
40.30 35.4125.63 23.26 22.22
42.52 36.3026.07 24.74 23.56
0.0010.0020.0030.0040.0050.00
A1 (0%) B1 (10%)
B2 (20%)
B3 (30%)
B4 (40%)
CO
MPR
ESS
IVE
ST
RE
NG
HT
OF
CO
NC
RET
E (N
/mm
2 )
% REPLACEMENT OF CEMENT BY FLY ASH
% REPLACEMENT OF CEMENT BY FLY ASH V/S COMPRESSIVE STRENGTH OF CONCRETE (N/mm2)
SPECIMEN AT 7, 14, 28, 56 AND 90 DAYS FOR M25
7 DAYS14 DAYS28 DAYS56 DAYS90 DAYS
Fig.3. % Replacement of Cement by Fly AshV/S Compressive Strength of Concrete (N/mm2)
Specimen at 7, 14, 28, 56 and 90 Days for M25
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34.8129.33 23.79 18.10 14.61
45.0434.96 25.48 18.37 16.44
50.8138.22
27.70 22.52 21.63
52.8940.74
30.81 25.48 23.70
53.9342.52
33.7826.52 25.33
0.0010.0020.0030.0040.0050.0060.00
A2 (0%)
B5 (10%)
B6 (20%)
B7 (30%)
B8 (40%)
CO
MPR
ESS
IVE
ST
RE
NG
HT
O
F C
ON
CR
ET
E (N
/mm
2 )
% REPLACEMENT OF CEMENT BY FLY ASH
% REPLACEMENT OF CEMENT BY FLY ASH V/S COMPRESSIVE STRENGTH OF CONCRETE (N/mm2)
SPECIMEN AT 7, 14, 28, 56 AND 90 DAYS FOR M40
7 DAYS
14 DAYS28 DAYS
Fig.4. % Replacement of Cement by Fly AshV/S Compressive Strength of Concrete (N/mm2) Specimen at 7, 14, 28, 56 and 90 Days for M40 TABLE 5 SPLIT STRENGTH AND % CHANGE OF STRENGTH AT 28, 56 AND 90 DAYS FOR M25 AND M40 Concrete
Mix
Average split Strength for cubes at % Change in split strength at
28 days [N/mm2]
56 days [N/mm2]
90 days [N/mm2]
28 days 56 days 90 days
A1 3.87 3.93 4.10 0 0 0 B1 3.44 3.59 3.70 (-) 11.11 (-) 8.65 (-) 9.75 B2 2.41 2.55 2.64 (-) 37.72 (-) 35.11 (-) 35.60 B3 2.26 2.31 2.44 (-) 41.60 (-) 41.22 (-) 40.48 B4 1.84 2.21 2.38 (-) 52.45 (-) 43.76 (-) 41.95 A2 5.14 5.30 5.42 0 0 0 B5 3.82 4.08 4.28 (-) 25.68 (-) 23.01 (-) 21.03 B6 2.78 3.05 3.41 (-) 45.91 (-) 42.45 (-) 37.08 B7 2.32 2.56 2.69 (-) 54.86 (-) 51.69 (-) 50.36 B8 2.13 2.40 2.53 (-) 58.56 (-) 54.71 (-) 53.32
3.87 3.44 2.41 2.26 1.843.93 3.59
2.55 2.31 2.21
4.10 3.70 2.64 2.44 2.38
0.002.004.006.00
A1 (0%) B1 (10%) B2 (20%) B3 (30%) B4 (40%)
SPLI
T ST
RE
NG
HT
OF
CO
NC
RET
E (N
/mm
2 )
% REPLACEMENT OF CEMENT BY FLY ASH
% REPLACEMENT OF CEMENT BY FLY ASH V/S SPLIT STRENGTH OF CONCRETE (N/mm2) SPECIMEN AT 28, 56
AND 90 DAYS FOR M25
28 DAYS56 DAYS90 DAYS
Fig.5. % Replacement of Cement by Fly AshV/S Split Strength of Concrete (N/mm2) Specimen at 28, 56 and 90 Days for M25
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5.14
3.822.78
2.32 2.13
5.30
4.083.05
2.56 2.40
5.42
4.283.41
2.69 2.53
0.001.002.003.004.005.006.00
A2 (0%) B5 (10%) B6 (20%) B7 (30%) B8 (40%)
SPL
IT S
TR
EN
GH
T O
F C
ON
CR
ET
E (N
/mm
2 )
% REPLACEMENT OF CEMENT BY FLY ASH
% REPLACEMENT OF CEMENT BY FLY ASH V/S SPLIT STRENGTH OF CONCRETE (N/mm2) SPECIMEN AT 28, 56
AND 90 DAYS FOR M40
28 DAYS56 DAYS90 DAYS
Fig.6. % Replacement of Cement by Fly AshV/S Split Strength of Concrete (N/mm2) Specimen at 28, 56 and 90 Days for M40 COST IMPACT ON CONCRETE
The basic market rates of materials are given in table 6. The change in cost due to addition of fly ash replacing cement is worked out in table 7. Cost decrease due to reduction in
cement.
TABLE- 6 COST OF MATERIALS Sr. No. Materials Rate (Rs/Kg)
1 Cement (OPC 53 grade) 6.40 2 Fly Ash 0.46 3 Fine aggregate 0.60 4 Coarse aggregate 0.65 5 Grit 0.65
TABLE-7 MATERIALS FOR DESIGNED M25 AND M40 CONCRETE Concrete
Mix %
Reduction in cement
Designed Materials for Concrete Total Cost [m3]
% Change in Cost Cement
[kg/m3] Fine
aggregate [kg/m3]
Coarse aggregate
[kg/m3]
Grit [kg/m3]
Fly ash [kg/m3]
A1 0 372.00 558.60 751.14 500.76 - 3529.70 0 B1 10 334.80 558.60 751.14 500.76 37.20 3308.73 (-) 6.26 B2 20 297.60 558.60 751.14 500.76 74.40 3087.76 (-) 12.52 B3 30 260.40 558.60 751.14 500.76 111.60 2866.79 (-) 18.78 B4 40 223.20 558.60 751.14 500.76 148.80 2645.82 (-) 25.04 A2 0 473.68 341.91 751.14 500.76 - 4159.24 0 B5 10 426.31 341.91 851.58 567.72 47.37 3877.87 (-) 6.76 B6 20 378.94 341.91 851.58 567.72 94.74 3596.49 (-) 13.53 B7 30 331.58 341.91 851.58 567.72 142.10 3315.17 (-) 20.29 B8 40 284.21 341.91 851.58 567.72 189.47 3033.79 (-) 27.05
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3529.70
3308.73 3087.762866.79 2645.82
4159.243877.87
3596.493315.17
3033.79
0500
10001500200025003000350040004500
0% 10% 20% 30% 40%
CO
ST O
F C
ON
CR
ET
EC
ON
CR
ET
E (R
s/m3 )
% REPLACEMENT OF CEMENT BY FLY ASH
% REPLACEMENT OF CEMENT BY FLY ASH V/S COST OF CONCRETE (Rs/m3) SPECIMEN FOR M25 AND M40
COST OF CONCRETE FOR M25 COST OF CONCRETE FOR M40
Fig.7. % Replacement of Cement by Fly AshV/S Cost of Concrete (Rs/m3) Specimen for M25 and M40 CONCLUSIONS
Based on limited experimental investigations concerning the compressive and split
strength of concrete, the following conclusions are drawn:
(a) The 10% replacement of cement by fly ash in M25 grade of concrete gives compressive
strength of 35.41 N/mm2 and 36.30 N/mm2for 56 days and 90 days respectively and 20%
replacement of cement by fly ash in M40 grade of concrete gives compressive strength of
25.63 N/mm2 and 26.07 N/mm2for 56 days and 90 days respectively. This is lower than
traditional concrete but similar to the required strength.
(b) The 10% replacement of cement by fly ash in M40 grade of concrete gives compressive
strength of 40.74 N/mm2 and 42.52 N/mm2 for 56 days and 90 days respectively. This is
lower than traditional concrete but similar to the required strength.
(c) The 10% replacement of cement by fly ash in M25 grade of concrete gives split strength
of 3.59 N/mm2and 3.70 N/mm2 for 56 days and 90 days split strength respectively and
20% replacement of cement by fly ash in M40 grade of concrete gives split strength of
4.08 N/mm2 and 4.28 N/mm2 for 56 days and 90 days respectively. This is lower than
traditional concrete but similar to the required strength.
(d) Cement replaced by 40% fly ash in M25 grade of concrete at 28 days and 90 days, %
change in compressive strength in N/mm2 decreases from 55.00% to 44.59% and for M40
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grade of concrete at 28 days and 90 days, % change in compressive strength in
N/mm2decreasesfrom 57.42% to 53.03% shown in Table-4.
(e) Cement replaced by40% by fly ash in M25 grade of concrete at 28 days and 90 days, %
change in split strength in N/mm2 decreases from 52.45% to 41.95% and for M40 grade
of concrete at 28 days and 90 days, % change in compressive strength in N/mm2decreases
58.56% to 53.32% shown in Table-5.
(f) Compressive strength and split strength reduces when cement replaced by fly ash.
(g) For M25 grade of concrete 20% fly ash replacement and for M40 grade of concrete 10%
fly ash replacement gives required compressive strength.
(h) Cement replaced by40% by fly ash in M25 grade of concrete, % change in cost decreases
25.04% for M40 grade of concrete, % change in cost decreases 27.05% shown in Table-7.
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