advantages and disadvantages of concrete
TRANSCRIPT
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Advantages and Disadvantages of Concrete
Soran UniversityFaculty of EngineeringCivil Engineering Department
1 June, 2015
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Welcome
• Abdulla Kawkas• Abdulaziz Ibrahim• Sarchia Khursheed• Wrya Sharif• Shaida Abdulraheem• Nechirwan Sabah• Ashna Kamil
Civil1
Group
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Outline1. Introduction2. Advantages
2.1 Durability2.2 Fire Resistance
3. Disadvantages
3.1 Cracking4. Conclusion
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Introduction to Concrete
• Concrete is a major materials that used for various structural purpose.
• Components of Concrete
• Uses of Concrete• Types of Concrete
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Advantages
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Advantages of Concrete
• Concrete is economical.
• It is not as likely to rot, corrode, or decay as other building materials.
• Concrete has the ability to be molded into any desired shapes.
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Advantages of Concrete (cont.)
• fire-safe and able to withstand high temperatures.
• casting can occur on the work-site which reduces cost.
• resistant to wind, water, rodents, and insects.
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Fire Resistance• A fire-resistance rating
typically means the duration for which a passivefire protection system can withstand a standard fire resistance test.
• The ability of a laboratory-constructed assembly to contain a fire in a carefully controlled test setting for a specified period of time.
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Fire Resistance (Cont.)• Concrete has a slow rate of
heat transfer, which means that concrete walls in a home act as a fire shield.
• concrete does not require any additional fire-protection because of its built-in resistance to fire.
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Durability• Durability of concrete is ability to
resist weathering action, chemical attack, and abrasion while maintaining its desired engineering properties.
• Types of durability:• Physical Durability: is against freezing
and thawing action, permeability of water, temperature stress.
• Chemical Durability: is against alkali aggregate reaction, sulphate attack, chloride ingress, delay Enttringites formation, corrosion of reinforcement.
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• Factors that affect on the durability of concrete:
• Cement Content: Mix must be designed to ensure cohesion and prevent segregation and bleeding.
• Compaction: The concrete as a whole contain voids can be caused by inadequate compaction.
• Permeability: It can be noticed that higher permeability is usually caused by higher porosity.
Durability
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Disadvantages
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Disadvantages of Concrete (cont.)
• Low tensile strength
• Low ductility
• Concrete is susceptible to cracking
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Cracking• Cracks can occur when provisions to accommodate these
movements are not made in design and construction.
• Concrete elements that affect cracking:• More amount of water• More amount of cement• Mineral composition• Shape• Surface Texture• Shape• Surface Texture• Some admixtures may also affects cracking
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Conclusion• Today concrete is the most used building material.
• Concrete has a good durability.
• Concrete has a high fire resistance.
• Concrete has some disadvantages.
• Cracking is one of the drawback of concrete.
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Any Question! ? Thank You!