GREEN CONCRETE

Prepared By: Guided By :Dhvani Sonani Dr.A.K.varmaM.E.structure Dr.D.R.bhatt

Overview of the presentation

In this topic of green concrete, I would be discussing about the following aspects of green concrete.

› Introduction› Genesis› Advantages› Production› Results of studies based on reported literature› Limitations› Scope in india› Conclusion

introduction

› Green concrete is a revolutionary topic in the history of concrete industry. This was first invented in Denmark in the year 1998.

› Green concrete is a type of concrete which resembles the conventional concrete but the production or usage of such concrete require minimum amount of energy and causes least harm to the environment.

› Green concrete has nothing to do with color.

Background

› Since concrete is the second most consumed entirely after water it accounts for around 5% of the worlds total CO2 emission.

› The co2 emission related to concrete production, inclusive of cement production , is between 0.1 and 0.2 t per tonne of produced concrete.

› Though these figures might seem to be minute but owing to the voluminous quantities of concrete produced each year, these figures attain a colossal amount.

› Further, due to increasing eco-awareness, the concrete producers needed a new technology that would reduce the environmental impact of concrete rather than switching to some substitute it.

Global green house gas emissions in year 2000 ( GT of CO2 equivalents )

CO2

23. 90 fossil fuels,3.94 deforestation14.80 OTHER ghgs,1.40 concrete indus-try,

ENVIRONMENTAL GOALS

› REDUCTION OF CO2 emissions by 21%

› Increase the use of inorganic residual products from industries other than the concrete industry by approx. 20%

› the recycling capacity of the green concrete must not be less compared to existing concrete types.

› The production and the use of green concrete must not deteriorate the working environment.

› The structure do not impose much harm to the environment During their service life.

Genesis

› The increasing awareness and activity to conserve the environment and the realization that concrete production too release a considerable amount of CO2 in the atmosphere were strong initiative to catalyze the genesis of GREEN concrete.

› In 1997, the kyoto protocol was signed which required the countries to cut down their CO2 emissions as assigned.

› After this, Denmark focused on cement and concrete production because approximately 2% of denmark’s total co2 emission stems from cement and concrete production.

› Cement and concrete may have an important role to play enabling the developed countries to fulfill their obligation to reduce the total CO2 emission by 21% compared to the 1990-level before 2012, as agreed at the kyoto conference.

› A typical cubic yard (0.7642 m3 ) of concrete contains about 10% by weight of cement. There have been a number of articles written about reducing the co2 emissions from concrete primarily throught the use of lower amounts of cement and higher amounts of supplementary cementitious material (SCM) such as fly ash and slag, which is using green concrete.

Advantages of green concrete› Green concrete has manifold advantages over the

conventional concrete.

› Reduces CO2 emissions, saves energy and waste water

› Since it uses the recycled aggregates and materials, it reduces the extra load in landfills and mitigates the wastages of aggregates.

› Economy.

› Elemental to sustainable development since it is eco-friendly itself.

› Helps in reducing the consumption of cement overall.

› The use of waste materials also solve the problem of disposing the excessive amount industrial wastes.

› Green concrete might solve some of the societies problems with the use of inorganic, residual products which should otherwise be deposited.

› Use of fly ash in the concrete also increases its workability and many other properties like durability to an appreciable extent.

Production of green concrete

Different methods of green concrete production

Residual products from

other industries

• Sewage sludge. Incineration ash

• Stone dust, concrete slurry

• Combustion ash from water purifying plants

Supplementary cementations

materials

• Large qty. of fly ash and micro silica

• GGBS

Cement with reduces

environmental impact

• Mineralised cement• Limestone addition

methods