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)

2Bagasse ash as replacement for cement in concrete

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

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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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