Introduction of Concrete
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Introduction of Concrete
- 1. Introduction of Concrete By Naveen K Singh M.Tech IIT Delhi
- 2. General Outline Introduction Advantages Disadvantages Constituents Type of concrete Summary
- 3. What is Concrete? Concrete is one of the most commonly used building materials. Concrete is a composite material made from several readily available constituents (aggregates, sand, cement, water). Concrete is a versatile material that can easily be mixed to meet a variety of special needs and formed to virtually any shape.
- 6. Layout of a ready- mix plant
- 7. Advantages Ability to be cast any shape Economical Durable Fire resistant Energy efficient On-site fabrication
- 8. Concrete is a viscous fluid
- 10. Low tensile strength Brittle failure We need to use reinforcement Disadvantages
- 11. Cement Water Aggregates- fine and coarse Chemical admixtures, e.g. superplasticizer, retarders, accelerators, etc. mineral additions e.g. fly ash, slag, rice husk, etc. Components of Concrete
- 12. Cement Components of concrete In construction cements are usually fine powders (100nm to 300 um) that harden on reacting with water. There are many types of cements used: Portland cements Ordinary cement White cement, etc.
- 13. Aggregate Aggregate is the granular material, such as sand, gravel, crushed stone, crushed blast-furnace slag, or construction and demolition waste that is used with a cementing medium to produce either concrete or mortar. Fine aggregate less than 5mm Coarse aggregate usually more then 5 mm Density of normal aggregates 2.8 g/cm3 Components of concrete
- 14. Components of concrete water Effect of impurities in water
- 15. Admixtures Admixtures are defined as materials other than aggregates, cement, and water, which are added to the concrete batch immediately before or during mixing. • The use of admixtures in concrete is now widespread due to many benefits which are possible by their application. Components of concrete Air–entraining admixtures Water reducing admixtures Accelerating admixtures Retarding admixtures
- 16. Application of admixtures To manage early age properties To manage later age properties For construction management reasons For practicality reasons For durability
- 17. Types of concrete Colored concrete Heavyweight concrete Lightweight concrete Recycled concrete Roller-compacted concrete tremie concrete No-slump concrete etc.
- 18. Summary Concrete is a versatile material It is usually a strong and durable Materials It suffers from a low tensile strength and brittle failure It is a mixture of cheap, locally available materials
- 19. THANK YOU FOR HEARING