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Non conventional concrete technologies
The document discusses non-conventional concrete technologies, highlighting self-compacting concrete and green concrete as innovative alternatives to traditional concrete. These technologies offer benefits such as higher durability, reduced CO2 emissions, and improved workability, while also addressing challenges like cost and the need for better plant control. The conclusion emphasizes that while these advanced concretes may be more expensive initially, they ultimately lead to better performance and lower overall installation effort.
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Non conventional concrete technologies
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- 2. Outline oIntroduction oConventional vs Nonconventional concrete oWhy Non conventional techniques are better oSome Non Conventional Concrete Technologies oConclusion
- 3. Conventional Concrete Conventional concreteis a conglomerate of hydraulic (Portland) cement , sand, stone, and water. It was developed approximately 150 years ago to imitate natural stone while providing less labor-intensive methods of shaping the material
- 4. Non-Conventional Concrete Technologies Taskspecific Environment Friendly Cost effective
- 5. Self Compacting Concrete oFirstdeveloped in 1988 oto achieve durable concrete structures. oFirst Practical use in Japan
- 6. DEVELOPMENT OF SELF-COMPACTING CONCRETE durabilityof concrete structures in Japan durable concrete structures sufficient compaction skilled workers Gradual reduction in skilled workers Requirement of new technology proposed by Okamura in 1986 It is a ‘High performance Concrete’ due to its high durability
- 8. Important Properties &Benefits Self-compactability Avoidance of bleeding and segregation Low shrinkage Low permeability Strength as needed Safer, quieter sites Better appearance
- 9. What is thesecret? Optimum Paste Viscosity and water content which is attained by one of three means: High cement content High content of Fly Ash, Silica Fume etc. Use of Viscosity Modifying Admixture Low water content using HRWR High Strength
- 10. REQUIREMENTS OF CONSTITUENT MATERIALS CEMENT Typicalcement content – 350 to 450 kg/m3. Cement > 500kg/m3 →shrinkage Cement < 300kg/m3 →Requires Extra fine fillers AGGREGATE Fine Aggregate Coarse AggregateFly ash: In appropriate quantity may be the added the quality
- 11. REQUIREMENTS OF CONSTITUENT MATERIALS Other Silicafumes: Added to improve the mechanical properties of scc. Stone powder: finely crushed lime stone,dolomite or granite added to increase the powder content. Fibres: fibres may be used to enhance the properties of scc as same as normal concrete
- 13. Measuring Flowability 1) SlumpFlow Test (Simple)
- 14. 2)Slump Flow Test(With J ring)
- 15. What are thedifficulties Higher cost – especially if high strength is not needed Plant control has to be better
- 16. Why it AppearsBetter? Segregation Resistance- Achieved by mortar viscosity, not aggregate grading No Bleeding and perfect compaction
- 17. Uses Can be usedfor heavily reinforced structures
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- 20. Green Concrete oFirst inventedin Denmark in the year 1998 Kyoto Protoclol oMade with concrete wastes oSustainable Construction
- 21. ADVANTAGES OF GREENCONCRETE Reduced CO 2 emissions. Low production costs. Saves energy, emissions and waste water. Helps in recycling industry wastes. Reduces the consumption of cement overall.
- 22. o Better workability. oSustainable development. o Greater strength and durability than normal concrete. o Compressive strength and Flexural behavior is fairly equal to that of the conventional concrete.
- 23. SUITABILITY OF GREENCONCRETE IN STRUCTURES Improve damping resistance of building. speed of construction, shorten overall construction period. Reduce the dead weight of a facade from 5 tons to about 3.5 tons. Good thermal and fire resistance, sound insulation than the traditional granite rock
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- 26. LIMITATIONS cost of reinforcement comparativelyless life Split tension of green concrete
- 27. High strength concrete strengthin excess of 60MPa ultra high performance concrete (UHPC) will more usually contain cement replacement materials and a high-range water-reducer (HRWR) or superplasticiser(SP
- 28. Ultra High StrengthConcrete In what kind of structures ?
- 29. Conclusion Concrete that isa little more expensive per cubic meter to buy BUT It will require less skill and effort to place It will look better with no appearance defects It will be more durable It will require more skill at the batching plant
- 30. References o Journal ofAdvanced Concrete Technology Vol . 1 , No . 1 , 5 - 1 5 (Self Compacting Concrete) o Edvardsen Ing. Carola and Tølløse Karsten (2001). Environmentally “Green” Concrete Structures o Benjamin A. Graybeal, and Joseph L. Hartmann(2003). STRENGTH AND DURABILITY OF ULTRA-HIGH PERFORMANCE CONCRETE