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BAGASSE ASH AS REPLACEMENT FOR CEMENT IN
CONCRETE
GUIDED BY : HANNAH S MATTAM ASST. PROFESSOR DEPT. OF CIVIL ENGINEERING
PRESENTED BY : NIBY JOSE S7 CE ROLL NO:49
INTRODUCTION
Cement –widely used construction material
Due to increase in demand
Researchers and scientist are in search of
alternative binder(eco friendly)
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SUGARCANE BAGASSE ASH (SCBA)
Agro waste from sugar cane industry
Bagasse-fibrous waste after extraction of
juice
Exhibits pozzolanic property
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PRODUCTION OF BAGASSE ASH
Raw sugarcane-paddy field
After extraction of juice-dried in open air
Burned in dry air
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Schematic representation of production of bagasse ash
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Bagasse Bagasse ash
Fine Bagasse ash
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Pictorial representation of bagasse, bagasse ash and fine bagasse ash
PC: Google Images
PROPERTIES OF BAGASSE ASH
Physical properties of cement and Bagasse ash
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Material Density (kg/m³)
Specific gravity
Fineness passing 45µm
Specific surface
area (m³/kg)
Mean grain size (µm)
Cement 1.15 3 82 300 21
Bagasse ash
0.4 1.8 95 900 5.1
Observations
The density is low
• Hence low weight concrete is obtained
Specific surface area is high
• Therefore adsorption, reaction on surface etc are improved
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Chemical properties of HPC* and Bagasse ash
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Material SiO2 Al2O3 Fe2O3 CaO MgO Na2O K2O S3O LOI
Cement 21.55 5.69 3.39 64.25 0.85 0.33 0.59 2.47 1.80
Bagasse ash
87.40 3.6 4.95 2.56 0.69 0.15 0.47 0.11 8.25
*HPC- High perfomance concrete
The percentage of silica is high-responsible for pozzolanic property
Silica reacts with components of cement during hydration imparts additional properties-Chloride resistance,Corrosion resistance etc
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Experimental study
Materials used
Cement (OPC)
Fine aggregate(passing 4.75mm and retained in150microns)
Coarse aggregate (20mm)
Bagasse ash as replacement for cement in concrete
Water (potable drinking water)
Sugarcane bagasse ash 0%,5%,10%15% and 20% replacement by weight of cement
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Mix design
M25 grade
Water cement ratio-0.48
Mixing
Mixed in mixer machine thoroughly –consistency is achieved
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Test on fresh concrete
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Sample designation
% of SBCA Workability
Slump(mm) Compaction factor
C0* 0 60 .95
N1 5 187 .96
N2 10 200 .96
N3 15 220 .97
N4 20 225 .97
* CO-Control Specimen
Workability increases as % of SCBA increases
Therefore use of super plasticizer is not essential
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Bagasse ash as replacement for cement in concrete
Test on Hardened Concrete Specimens
150mmx150mmx150mm cubes (compressive strength)
150mmx300mm cylinder(split tensile strength)
750mmx150mmx150mm prism(flexural strength)
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Casting
Before casting oil is spreaded on inner surface of mould
Concrete is poured and compacted(using vibrator)
Top surface is finished by trowel
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Curing
Demoulded after 24 hours
Cured under water
Testing
The compressive, flexural and split tensile strength is tested
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Compressive strength
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% of SBCA
7 Days (Mpa)
28 Days (Mpa)
56 Days (Mpa)
90Days (Mpa)
0 19.84 31.85 34.51 37.62
5 22.07 32.88 36.58 40.73
10 24.99 35.04 40.44 44.14
15 17.92 24.58 30.51 34.21
20 15.82 23.25 27.25 30.36
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Compressive strength of M25 grade concrete at different ages
Split tensile strength
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% of SBCA
7Days (Mpa)
28Days (Mpa)
56Days (Mpa)
90Days (Mpa)
0 1.5 2.44 2.93 3.48
5 2.07 3.06 3.48 4.05
10 2.49 3.48 4.05 4.61
15 1.13 1.69 2.16 2.63
20 0.8 1.36 1.79 2.16
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Split tensile strength of M25 grade concrete at different ages
Flexural strength
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% of SBCA
7Days (Mpa)
28Days (Mpa)
56Days (Mpa)
90Days (Mpa)
0 7.08 9.52 10.41 10.94
5 8.25 10.35 10.86 11.16
10 9.43 10.71 11.48 11.92
15 6.55 8.98 9.42 10.16
20 5.94 7.87 8.85 9.36
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Flexural strength of M25 grade concrete at different ages
Test results
The compressive strength ,split tensile strength and flexural strength increases by increasing % of SCBA up to 10%
Beyond 10% the strength decreases
This is due to quantity of SCBA is higher than the amount required
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It combines with liberated lime
Leading to excess silica leaching out
Causes deficiency in strength
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Effect of elevated temperature
The properties of concrete changes –exposed to elevated temperature
Bagasse partially replaced - exposed to different elevated temperature (2000C,4000C,6000C,8000C)
For one hour
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Immediately cooled with water
At 2000C concrete had better compressive strength than room temperature
It is due to micro filling ability and pozzolanic properties of SCBA
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Sudden decrease in strength at 8000C and 6000C
Damage occurs to calcium silicate hydrate (CSH strength contributing compound)
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Conclusion
Density is less therefore light weight concrete can be obtained
Workability increases
Use of super plasticizers is not essential
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Compressive ,flexural, split tensile strength increases (10% replacement)
Compressive strength increases – upto 2000C elevated temperature
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REFERENCE1.Mrs.U.R.Kawade, Mr.V.R.Rathi, Miss Vaishali D. Girge, “Effect Of Use Of Bagasse Ash On Strength Of Concrete”, International journal of innovative research in science, engineering and technology 2 (2013), 2997-3000. 2.Shruthi H R ,Dr.H Eramma ,Yashwanth M K ,Keerthi gowda B S “ A study on baggase ash replaced plain cement concrete”, International Journal of Advanced Technology in Engineering and Science www.ijates.com Volume No.02, Issue No. 08, August 2014 ISSN (online): 2348 – 7550
Bagasse ash as replacement for cement in concrete 33
3. A.D.V.S. Siva Kumar , K.V.G.D. Balaji, T. Santhosh kumar“Behavior of sugarcane baggase ash concrete exposed to elevated temprature”International Journal of Advance Research In Science And Engineering http://www.ijarse.com IJARSE, Vol. No.3, Issue No.7, July 2014 ISSN-2319-8354(E) 4. T. S. Abdulkadir, . D. O. Oyejobi, . A. A. Lawal “Evaluation Of Sugarcane Bagasse Ash As A Replacement For Cement In Concrete Works” Acta Tehnica Corviniensis-Bullethin Of Engineering Tome Vii (2014) Fascicule 3 Issn:2067-3890
5. Mrs.U.R.Kawade1, Mr.V.R.Rathi2, Miss Vaishali D. Girge3“Effect of use of Bagasse Ash on Strength of Concrete[International Journal of Innovative Research in Science, Engineering and Technology Vol. 2, Issue 7, July 2013 ISSN: 2319-87532014] Fascicule 3 [July – September]
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