PROTECTION OF ENVIRONMENT BY THE USE OF FLY ASH IN

CONCRETE ROAD CONSTRUCTION

PRESENTED BYG.NIKHIL KUMAR

GENERAL INTRODUCTION TYPES OF FLY ASH PROPERTIES OF CEMENT WITH FLY ASH &

FLY ASH TESTS ON FLY ASH USING CONCRETE USES OF FLY ASH BENEFITS OF FLY ASH USING CONCRETE APPLICATIONS OF FLY ASH USING CONCRETE EFFECT OF FLY ASH ON ENVIRONMENT CONCLUSION

CONTENT

The unit cost of concrete can be reduced by partial replacement of cement with fly ash.

The disposal of fly ash is one of the major issues for environmental.

Dumping of fly ash as waste material causes severe environmental problems.

GENERAL INTRODUCTION

1.ORIGION OF FLY ASH

Residue collected from the combustion

of natural coal

It is produced by the thermal power plantIn India , every year

70 million kegs of fly ash is produced.

2.Why fly ash use in concrete

using fly ash to replace Portland cement in concrete not only provides the benefit of recycling fly ash but also reduces emissions.

Using Fly ash can reduced the total amount of energy needed to make concrete pavement

Class F: produced from the burning of anthracite or

bituminous coal Silica, alumina , iron oxide & other constituents It is having low calcium content is <15% High strength & high degree of workability is lowClass C: produced from the semi-bituminous coal It is having high calcium content is <15% High strength &high degree of workability is high Relatively high of calcium oxide lesser of

silica ,alumina , & iron oxide

Types of fly ash

Fly ash with cement:

Strength is more Durability is high Shrinkage is high

It is harder material Plasticity is more

Segregation is low

Cement :

Strength is Less Durability is less Shrinkage is

moderately low It is less harder

material Plasticity moderately

is less Segregation is high

Comparison of Properties of cement with fly ash & cement

Fresh concrete test

Hardened concrete test

Tests of fly ash

1.Workability : The slumped

concrete takes various shapes, and according to the profile of slumped concrete, the slump is termed as true slump, shear slump or collapse slump.

Fresh concrete test

To determine the quantity of water required to produce a concrete paste of standard consistency.The standard consistency is that consistency, which will permit the vicat plunger to penetrate to a point 5 to 7mm from the bottom of the vicat mould

2.Standard consistency :

3.Compaction factor test : C.F=wt of partially compacted concrete/wt of fully compacted concreteCompaction factor should not more than 1, should not less than 0.90

Compression strength test:

Strength=applied load/ cross section area

Flexural strength test:

Strength=2*3.14/lbd

Tensile strength test :

Strength=max tensile load/ cross section area

Hardened concrete test

It is improves the strength

To increase the workability of the concrete

To reduce the heat of hydration

To increase the durability To construct cost effect

construction To reduce the demand of

land of fly ash disposal To save the environment

Uses of fly ash

Benefits of fly ash using concrete

It is used in buildings

It is used in roads

It is used in bridges

It is used in dams also

Application of fly ash using concrete

Global warming and climate conditions change are increasing important issues

Many governments are looking at different ways to reduce green house gas emissions

Effect of fly ash on environment

F

From this project we conclude that the fly ash based concrete in road construction is the far better than normal concrete with out fly ash

Fly ash use in concrete improves all the properties of concrete

To construct the cost –effective construction

Conclusion :