PPT_26[1].04.11 Second Review

8/7/2019 PPT_26[1].04.11 Second Review

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INTRODUCTION

FLY ASH Fly ash is one of the residues generated in the combustion of

coal.

Fly ash is generally captured from the chimneys of coal-firedpower plants.

Fly ash is a finely divided form and in the presence of water, itreact with calcium hydroxide at ordinary temperature to produce

cementations compounds.

Moreover the huge quantities of fly ash generated by ThermalPower Plants disposal become crucial to the management.


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Indian RMC manufactures add 15-18% fly ash to concrete but

the common man here still does not comprehend the benefits

derived from the usage of fly ash in cement or concrete.

Fly ash has been found to have numerous advantages such as

improved workability, reduce permeability, increased ultimate

strength, reduce bleeding and reduce the heat of hydration in theconcrete works.

INTRODUCTION


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Classification of Fly ash

Class F fly ash:

Fly ash that is production from the burning of anthracite or

bituminous coal is referred as class F fly ash.

Class C fly ash:

Fly ash that is produced from the burning of lignite or sub

bituminous coal is referred as class C fly ash. Most class C Fly ashhave self-cementing properties.

INTRODUCTION


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Since the F type Fly ash available at nearest source of Ennur

(Chennai) Thermal power plant hence it is decided to adopt the

F type fly ash for our study.

Fly ash collected through Gammon India Ltd., Bombay. fromKalpakkam project.

It has been verified the type of fly ash by their test certificate

showing composition of Fly ash and as per the recommendation

of codes.

FLY ASH SELECTION


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Experimental study by comparing the concrete of43 grade Ordinary

Portland cement (OPC) concrete and Concrete with replacement of

fly ash15%, 30% & 45% with OPC. Keeping all the other ingredients

are same.

This study orientation is as for as Durability of concrete is

concern. It includes Compressive strength, Water permeability

and Rapid chloride penetration tests are taken for comparison.

SCOPE


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Stage 1

Selection of mix Nominal mix ratio with OPC 43 grade pennacement. The cement content adopted = 400Kg/Cu.M ,

The Mix Proportions are 0.55 : 1 : 1.50 : 3.00 ( The Ratio of Coarseaggregate by 20 : 12.5mm = 60 : 40 %)

Casting of 150mm cube -12nos, 100mm dia. x 150mm length-1No

Compressive strength of concrete carried out in 7, 14 and 28 days

after date of casting.

Water permeability of concrete cube and Rapid chloride penetrationtest at the age of 28 days.

METHODOLOGY


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Stage 2

Selection of mix Nominal mix ratio. 15% of Fly ash replacementwith OPC of penna 43 G. (Cement + Fly ash = (60 + 340)Kg/Cu.M .



Compressive strength of concrete carried out in 7, 14 and 28 daysafter date of casting.


METHODOLOGY


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Stage 3

Selection of mix Nominal mix ratio. 30% of Fly ash replacementwith OPC of Penna 43 Grade. (Cement + Fly ash = (120 + 280)Kg/Cu.M



Compressive strength of concrete carried out in 7, 14 and 28 daysafter date of casting.


METHODOLOGY


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SLNO.

DESCRIPTIONOF WORKS /DESIGNATION

MARK

DATE OFCASTING

NOSOF

CUBE

NOSOF

CYLINDER

COMPRESSIVE STRENGHTN/MM2

RCPTVALUEAFTER

28DAYS

PERMEABILITY AFTER

28 DAYS7 DAYSTESTING

DATE

14DAYSTESTING DATE

28 DAYS

TESTINGDATE

1 43 G OPCCONCRETE

16.03.2011 12 1 23.03.2011 30.03.2011 13.04.2011 13.04.2011 13.04.2011

2 30% REPLACEDFLY ASH WITH 43

GRADE OPCCONCRETE

17.03.2011

12 1 24.03.2011

31.03.2011

14.03.2011

14.03.2011

14.03.2011

3 15% REPLACED

FLY ASH WITH 43GRADE OPCCONCRETE

21.03.20

11

12 1 28.03.201

1

04.04.20

11

18.04.201

1

18.04.20

11

18.04.2011

4 45% REPLACEDFLY ASH WITH 43

GRADE OPCCONCRETE

22.03.2011

12 1 29.03.2011

05.04.2011

19.04.2011

19.04.2011

19.04.2011

SCHEDULE OF PROJECT WORK


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PROJECT PROGRESS

BLENDING OF FLY ASH WITH OPC


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PROJECT PROGRESS

Processing Stage - 1

Selection of mix Nominal mix Proportions are 0.55 : 1 : 1.50 : 3.00 (The Ratio of Coarse aggregate by 20 : 12.5mm = 60 : 40 %)

Date of Casting of cube and cylinder = 16.03.2011

DESCRIPTION OF WORKS /DESIGNATION MARK


RCPTVALUE

Coulombs7 DAYS 14 DAYS 28 DAYS

CONCRETE SPECIMEN WITH43 G OPC

34.66 41.33 42.67 279 5


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VIEW ON RESULTS

INFERENCE: 80% of strength attained

in 7 Days itself.


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PROJECT PROGRESS

FRESH CONCRETE SLUMP MEASUREMENT


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PROJECT PROGRESS

SPECIMEN PREPARED FOR TESTING


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PROJECT PROGRESS

Processing Stage - 2

Selection of mix Nominal mix Proportions are 0.55 : 1 : 1.50 :3.00 ( The Ratio of C.A by 20 : 12.5mm = 60 : 40 %)

15% replaced fly ash with 43 grade OPC


DESCRIPTION OF WORKS /

DESIGNATION MARK

COMPRESSIVE STRENGHT

N/MM2

RCPT

VALUECoulom

bs

PERMEABI

LITYmm7 DAYS 14 DAYS 28 DAYS

15% REPLACED FLY ASH

WITH 43 GRADE OPCCONCRETE

27.11 38.67 43.11 224.1 5


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VIEW ON RESULTS

INFERENCE: Initial strength gain in 7 days 63%

but at the age 28 days it is observed more than

the concrete made with OPC.


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PROJECT PROGRESS


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PROJECT PROGRESS


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PROJECT PROGRESS

Processing Stage 3

Selection of mix Nominal mix Proportions are 0.55 : 1 : 1.50 :3.00 ( The Ratio of C.A by 20 : 12.5mm = 60 : 40 %)

30% replaced fly ash with 43 grade OPC cement .


DESCRIPTION OF WORKS /DESIGNATION MARK


RCPTVALUE

Coulombs

PERMEABILITY

mm7 DAYS 14 DAYS28 DAYS

30% REPLACED FLY ASHWITH 43 G OPC CONCRETE

19.55 31.11 32.89 205.2 4


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INFERENCE: Initial strength gaining is 60% in 7 days and at the age 28

days it is observed marginally lower strength ie only 23% less than

OPC concrete.

VIEW ON RESULTS


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PROJECT PROGRESS


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PROJECT PROGRESS

Processing Stage 4Selection of mix Nominal mix Proportions are 0.55 : 1 : 1.50 :

3.00 ( The Ratio of C.A by 20 : 12.5mm = 60 : 40 %)

45% replaced fly ash with 43 grade OPC


DESCRIPTION OF WORKS

/ DESIGNATION MARK

COMPRESSIVE STRENGHT

N/MM2

RCPT

VALUE

Coulombs

PERMEABILI

TY

mm7 DAYS 14 DAYS 28 DAYS

45% REPLACED FLY ASHWITH 43 G OPC 12 16.89 24.44 155.7 3


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VIEW ON RESULTS

INFERENCE: Initial strength gaining is 50% in 7 days and at the age 28

days it is observed significantly lower strength ie about 43% less than

OPC concrete.


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PROJECT PROGRESS


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VIEW ON RESULTS


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VIEW ON RESULTS


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VIEW ON RESULTS


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VIEW ON RESULTS


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ConclusionWORKABILITY:

Measure of workability by means slump value: Compare to Concrete

with OPC, fly ash has replaced concrete shown lower slump.

That is the demand of water shown more when % of replacement of fly

ash is high. This will help to reduce the W/C ratio, which is very effective

for durability of concrete.

COMPRESSIVE STRENGTH :

Compressive strength gain from 7 days to 28 days shown higher %compare to the concrete with fly ash replacement than opc. ie it varies

from 37 % to 50%.

As per the references we found that strength gain will be large even after

28 days till 56 days.

WATER PERMEABILITY :

Water permeability test shown very lower penetration of water in Fly

ash replaced concrete compare to the OPC concrete.

RPID CHLORIDE PENETRATION :

Chloride penetration also shown very lower toward the increase in %

of fly ash over the OPC concrete.


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The effect of nano-clay on the mechanical properties and microstructureof Portland cement mortar was investigated.

In this research is to constitute a blended cement mortar with highmechanical properties.

The nano-clay used in this investigation was nano-kaolin. The compressive strength, tensile strength, phase composition and

microstructure of mortar were investigated. The results showed that the compressive strength and the tensilestrength of the cement mortars with nano-kaolin were higher than plaincement mortar with the same w/c ratio.

Effect of Nano-clay on Mechanical Properties and Microstructure ofOrdinary Portland Cement Mortar by M. S. Morsy, S. H. Alsayed andM. Aqel

REVIEW OF LITRATURE


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One focus in recent atmospheric pollution research is on fine ParticleMatter (PM)

Hard Coal Fly Ash (CFA) is a by-product from power plants burning hardcoal. Hard coal fly ash is a smell less, grey, fine-grained and powderysubstance, which consists mainly of spherical, glassy particles.

CFA could have unfavorable effects on the condition of groundwater,since some of the aforesaid mineral materials can contaminate groundwaters.

The application of CFA onto leaves showed no effect over a period offour weeks with regard to root rating, habitus rating, growth height, leavenumber and dry weight development

Hard Coal Fly Ash and Silica-Effect of Fine Particulate MatterDeposits on Brassica chinensis byChristian Ulrichs, Uwe Schmidt,

Tanja Mucha-Pelzer, Arunava Goswami and Inga Mewis.

REVIEW OF LITRATURE


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1. M. S. Morsy, S. H. Alsayed and M. Aqel, Effect of Nano-clay on

Mechanical Properties and Microstructure of Ordinary PortlandCement Mortar, International Journal of Civil & EnvironmentalEngineering (IJCEE-IJENS) , Vol: 10 No: 01

2. by Christian Ulrichs, Uwe Schmidt, Tanja Mucha-Pelzer, ArunavaGoswami and Inga Mewis , Hard Coal Fly Ash and Silica-Effect of

Fine Particulate Matter Deposits on Brassica chinensis , Journal ofAmerican Science, 6(4),2010.

3. Text book ofConcrete technology by M.S. Shetty volume-1.

4. Indian Concrete Journal of November 2004 Volume 78. High-Volume Fly Ash Concrete By Dr. V.Mohan Malhotra and Prof.

P.K.Mehta.5. Elsevier of 15th September2010 Fly Ash Characterization and its

Application By S.Zahi and A.R . Daud Faculty of Engg. AndTechnology, Multimedia University, Malasia.

REFERENCE


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PPT_26[1].04.11 Second Review

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