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Concrete as Building material
- 1. COURSE NO: ARCH 1201 COURSE TITLE: BUILDING MATERIALS Lecture 7 CONCRETE
- 2. CONCRETE
- 3. A Text Book of Engineering Materials- by Dr. M. A. Aziz CONCRETE IS AN ARTIFICIAL STONE Binding material + Inert material + Water Cement and lime Aggregates •Fine aggregates •Coarse aggregates Sand and surki Brick khoya, broken stones, gravels, pebbles etc
- 4. A Text Book of Engineering Materials- by Dr. M. A. Aziz FUNCTIONS OF AGGREGATES IN CONCRETE Adds volume
- 5. A Text Book of Engineering Materials- by Dr. M. A. Aziz 1. To wet the surface of aggregates . 2. To prepare a plastic mixture of various ingredients. 3. Hydration of the cementing materials. FUNCTIONS OF WATER IN CONCRETE
- 6. A Text Book of Engineering Materials- by Dr. M. A. Aziz CLASSIFICATION OF CONCRETE Lime concrete= Lime+Surki+Khoa+Water Cement concrete= Cement+Sand+Khoa+Water 1 2 5 1 2 4 1 3 6 or
- 7. A Text Book of Engineering Materials- by Dr. M. A. Aziz Segregation Separation of constituents Two types of separation can occur Separation of groutSize of particles SOME SPECIAL TERMS
- 8. A Text Book of Engineering Materials- by Dr. M. A. Aziz Bleeding Rising water to the surface of concrete SOME SPECIAL TERMS
- 9. A Text Book of Engineering Materials- by Dr. M. A. Aziz Laitence formation of cement paste at the surface Due to bleeding and bad workmanship SOME SPECIAL TERMS
- 10. A Text Book of Engineering Materials- by Dr. M. A. Aziz PROPERTIES OF CONCRETE •Strength Compressive Tensile Flexural Shear •Elastic properties •Fatigue •Durability •Impermeability and •Workability
- 11. A Text Book of Engineering Materials- by Dr. M. A. Aziz FACTORS CONTROLLING PROPERTIES OF CONCRETE •Grading of the aggregates •Moisture content of the aggregates •Water-cement ratio •Quality of water for mixing & curing •Proportioning the various ingredients of concrete •Method of mixing •Placing and compaction of concrete •Curing of concrete
- 12. A Text Book of Engineering Materials- by Dr. M. A. Aziz PRE-CAST CONCRETE Cast into moulds either in a factory or at the site Hardening & curing are also carried out where it is cast Used in lintels, ornamentation & architectural works in buildings Advantages Better supervision, production not hampered by weather conditions, less shuttering requirements, time of construction is less & quick laying of precast units on site
- 13. A Text Book of Engineering Materials- by Dr. M. A. Aziz R.C.C.-REINFORCED CEMENT CONCRETE Very strong in compression Easy to produce at site and inexpensive Steel is very strong in tension Contain the liquid concrete and give it the form and shape we need. Contains steel bars
- 14. A Text Book of Engineering Materials- by Dr. M. A. Aziz P.C.C.-PRE STRESSED CEMENT CONCRETE Concrete remains un-cracked Reduction of steel corrosion Increases durability High span to depth ratio less dead load More economical Builds in compressive stresses during construction
- 15. RECOMENDED REFERENCES Aziz. M. A: Engineering Materials. Smith, R. C: Material of construction. Andres, C. K: Manufactures manuals and brochures,