Green concrete is a more sustainable type of concrete that uses recycled and waste materials as substitutes for natural aggregates and cement. It aims to reduce CO2 emissions by 21% and increase the use of industrial waste products by 20%. There are four main ways to produce green concrete: 1) using fly ash, 2) using stone dust, 3) using waste glass or sewage sludge ash, and 4) developing new low-impact cements. Green concrete provides benefits like reduced costs, less environmental impact, and comparable or improved strength and durability over traditional concrete.

1. AA
PRESENTATIONPRESENTATION
ONON
GREEN CONCRETEGREEN CONCRETE
Department of Civil Engineering
ShriVishnu Engineering College For Women,Bhimavaram

2. ContentsContents
Definition
Environmental goals
Four ways to produce green concrete
Use of Recycled aggregate and crushed brick
as fine aggregate
Use of waste glass as a replacement of
natural sand or fine aggregate
Use of quarry or stone dust
Use of sludge incineration ash
Advantages
Conclusion

3. DEFINITIONDEFINITION
Green Concrete is a term given to a concrete
that has had extra steps taken in mix design that
is replacement of naturally available materials in
concrete with the recycled materials to ensure a
sustainable structure and along life cycle with a
low maintenance cost .

5. Environmental GoalsEnvironmental Goals
Green Concrete is expected to fulfill the following environmental
obligations:
 Reduction of CO2 emissions by 21 %.
 Increase the use of inorganic residual products from industries
other than the concrete industry by approx. 20%.
 Reduce the use of fossil fuels by increasing the use of waste
derived fuels in the cement industry.
 The recycling capacity of the green concrete must not be less
compared to existing concrete types.
 The structures do not impose much harm to the environment
during their service life.

6. Four ways to produce green concreteFour ways to produce green concrete
1. To increase the use of conventional residual
products, i.e. fly ash.
2. To use residual products from the concrete
industry, i.e. stone dust (from crushing of stones).
3. To use residual products from other industries not
traditionally used in concrete, i.e. fly ash from bio
fuels and sewage sludge incineration ash (from
sewage treatment).
4. To use new types of cement with reduced
environmental impact.

9. USE OF RECYCLED AGGREGATE ANDUSE OF RECYCLED AGGREGATE AND
CRUSHED BRICK AS FINE AGGREGATESCRUSHED BRICK AS FINE AGGREGATES
Strength and deformation characteristics:
• The lower compressive strength recorded for
concrete produced with recycled aggregate was
due to higher water cement ratio.
• Concrete produced with recycled aggregates tend
to have higher levels of dry shrinkage than
concrete produced with natural aggregates.
• The replacement of 50% of cement with slag led
to improve tensile strength for recycled aggregate
concrete.

10. Usage of Green Concrete

11. Durability:
Recycled aggregate concrete has better
resistance to carbonation than natural
aggregate concrete.
Recycled aggregate concrete provides
better resistance to freezing and then
concrete produced by mixing natural
aggregates.

12. CRUSHED BRICK
RECYCLED AGGREGATE

13. USE OF WASTE GLASS AS A REPLACEMENTUSE OF WASTE GLASS AS A REPLACEMENT
TO NATURAL SAND OR FINE AGGREGATETO NATURAL SAND OR FINE AGGREGATE
Many of researchers reported that tensile
splitting strength and flexural strength were both
reduced with the presence of recycled glass sand
in concrete.
Glass by nature is an impermeable material.
Hence by using recycled glass sand can reduce
the permeability of concrete mix and may
enhance its durability and restrict the migration
of water ions inside the concrete.

14. A higher compressive strength is achieved when 20%A higher compressive strength is achieved when 20%
of cement was replaced by glass powder in concrete.of cement was replaced by glass powder in concrete.
CRUSHED GLASS GLASS POWDER

15. Use of quarry or stone dustUse of quarry or stone dust
 When quarry or stone dust is used in
concrete as a 100% replacement of natural sand
with stone dust does not change the
compressive strength of concrete or there will
be improvement in the compressive strength of
concrete.
There was up to 10% increase in compressive
strength and flexural strength of concrete when
concrete is produced by fully replacement of
natural sand by crushed rock dust.

16. Researchers are suggested
that replacement of natural
sand with crushed rock
dust is possible when
particles of crushed rock
dust are finer than 0.075
mm are 15% as fine
aggregate as per codal
provisions.

17. Use of sludge incineration ashUse of sludge incineration ash
 Most municipal solid waste is disposed of in land fills, a
traditional waste disposal process.
 Because of lack of suitable land fill space, in many countries
incineration of such waste had received widespread attention.
 The ash obtained from such incineration has an average
chemical composition as that of coal fly ash.
 As a matter of fact, a great advantage in sustainability of
concrete would be achieved if such ground ashes could actually
be used in concrete production.

18. Sludge Incineration Ash

19. ADVANTAGESADVANTAGES
Reduced CO2 emissions.
Low production costs as wastes directly
substitute the cement.
Saves energy, emissions and waste water.
Helps in recycling industry wastes.
Reduces the consumption of cement
overall.

20. Cont…..Cont…..
Better workability.
Greater strength and durability than normal
concrete.
Compressive strength and Flexural behaviour is
fairly equal to that of the conventional concrete.
Green concrete might solve some of the
societies‘ problems with the use of inorganic,
residual products which should otherwise be
deposited.

22. ConclusionConclusion
 Green concrete having reduced environmental impact with
reduction of the concrete industries co2 ±emissions by 30%.
 Green concrete is having good thermal and fire resistant.
 In this concrete increased concrete industry’s use of waste
products by20%. Hence green concrete consumes less energy
and becomes economical.
 So definitely use of concrete product like green concrete in
future will not only reduce the emission of co2in environment
and environmental impact but also economical to produce