Green concrete

green concrete

1. GREEN CONCRETE BY VODEPALLI MANASWINI B.TECH. 4/4 CIVIL ENGINEERING ROLL NO:141248

2. Concrete is a composite construction material made primarily with  aggregate ,  cement, and water CONCRETE

3. concrete is the second most consumed entity after water it accounts for around 5% of the world‘s total CO2 emission Carbon dioxide is one of the green house gas which is responsible for global warming IMPACT ON ENVIRONMENT DUE TO CONCRETE 1. Green house gas emission

4. The main ingredient in concrete is cement and it consists of Limestone (Calcium Carbonate CaCO3) During manufacture of cement, its ingredients are heated to about 800 - 10000C. During this process the Carbon Dioxide is driven off CaCO3 CaO + CO2 Approximately 1kg of cement releases about 900gms of Carbon Dioxide into the atmosphere.

5. Major ingredient in the production of concrete is aggregates without aggregates it is impossible to produce concrete Aggregates are mined from the rock mines and the rate with which concrete is produced there will be significant reduction in naturally occurring materials. 2.Reduction in naturally occurring materials

6. 3.Disposal of construction and demolition waste Disposal of construction and demolition waste has become a major problem these days According to the report of Technology, Information, Forecasting, Assessment Council the total amount of waste from construction industry is estimated to be 12 to 14.7 million tons per annum Out of which 7.8 million tons are concrete and brick waste. Because of increasing problems of these wastes many countries have started researches to use these materials as source

7. Green concrete means eco- friendly concrete. concrete that uses less energy in its production & produces less carbon dioxide than normal concrete GREEN CONCRETE

8. Optimizes use of available material Better Performance Enhanced cohesion workability / consistency Reduced shrinkage / creep. Durability - Better service life of concrete Reduced carbon footprint No increase in cost LEED India Certification FEATURES OF GREEN CONCRETE The concrete which can fall in the category of green must have the following characteristics .

9. Resource Efficiency Indoor Air Quality Energy Efficiency Water Conservation Affordability MATERIAL SELECTION CRITERIA

10. 1.Cement REPLACEMENT OF MATERIAL FOR GREEN CONCRETE sludge ash municipal solid waste fly ash.

11. 2. Coarse aggregates Recycled aggregates recycled aggregates with crushed glass blast furnace slag

12. 3.Fine aggregates Fine recycled aggregate demolished brick waste quarry dust waste glass powder marble sludge powder Micro silica

13. Lasts Longer Uses Industrial Waste Reduces Energy Consumption Reduces CO2 Emissions ENVIRONMENTAL BENIFITS BY USING GREEN CONCRETE

14. Using light weight aggregates, the density of the concrete decreases to 300 to 1850 kg/m3 The use of lightweight concrete provides structural efficiency and economic advantages. It helps in reduction of the dead load, increases the progress of the building, and lowers haulage and handling costs relatively low thermal conductivity LIGHT WEIGHT AGGREGATES

15. Structural Light Weight Aggregate Concrete is a concrete having 28 day compressive cement strength more than 17 MPa and 28 day air dried unit weight not exceeding 1850 kg/m3. The concrete may consists entirely of light weight aggregate or a combination of light weight aggregate and normal weight aggregates Use of air-entrainment will greatly improve the workability, and the tendency for bleeding in the light-weight concrete. STRUCTURAL LIGHT WEIGHT CONCRETE

16. This cement is based on an intermediate product, clinker, which is produced with minor additions of mineralizes to the kiln..These mineralizes are Calcium Sulphate (CaSO4) and Calcium Fluoride (CaF2).With the addition of these mineralizes, the energy consumptions are reduced by 5%. Also the CO2 emissions get reduced. It is found that there is a 5-10% increase in 28-day strength of the cement GREEN CEMENT

17. Reduce the dead weight of a structure and reduce crane age load Good thermal and fire resistance, sound insulation than the traditional granite rock Improve damping resistance of building. Speed of construction, shorten overall construction period. Green concrete requires less maintenance and repairs Green concrete sometimes give better workability than conventional concrete SUITABILITY OF GREEN CONCRETE IN STRUCTURES

18. Optimized mix designs mean easier handling, better consistency and easier finishing Reduction in shrinkage & creep Green Concrete uses local and recycled materials in concrete. The heat of hydration of green concrete is significantly lower than traditional concrete This result in a lower temperature rise in large concrete pours which is a distinct advantage for green concrete ADVANTAGES OF GREEN CONCTERE

19. Mix can result in a reduced paste volume within the concrete structure resulting in a higher level of protection against concrete deterioration. Higher strength per kilogram of cement Increased durability & lower permeability More aggregates typically mean higher Modulus of elasticity. IMPROVED ENGINEERING PROPERTIES

20. By using stainless steel, cost of reinforcement increases. Structures constructed with green concrete have comparatively less life than structures with conventional concrete. Split tension of green concrete is less than that of conventional concrete LIMITATIONS

21. 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 recycling use of waste material such as ceramic wastes, aggregates, so increased concrete industry’s use of waste products by 20%. 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 co2 in environment and environmental impact but also economical to produce. CONCLUSION

22. “concrete technology” – M.S.SHETTY https://en.m.wikipedia.org/wiki/Environmental_impact_of_concrete http://www.greenconcrete.info/recycled.html IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 14, Issue 3 Ver. II (May. - June. 2017), PP 33-35 www.iosrjournals.org Orsos , T., ‘BST: The Lightweight concrete aggregate’, Concrete Institute of Australia seminar on Special UseConcretes,Melbourne , 1992 . B.L.Rajput and Indrasen Singh, “Green Concrete- An Overview”, Indian Highways Journal, February 2012 REFERENCES

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