Chapter2
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Transcript of Chapter2
![Page 1: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/1.jpg)
Materials
Chapter 2
![Page 2: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/2.jpg)
Reinforced Concrete
• Concrete
– Cement
– Aggregate
• Coarse
• Fine
– Water
– Admixture
![Page 3: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/3.jpg)
Cement
• Ordinary Portland Cement- Type I
• CaO-Limestone
• SiO2 Al2O3 -Clay or shale
• Ground, blended and fused to clinker in kiln
• Gypsum is added
• Comes in bag of 50kg
![Page 4: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/4.jpg)
Cement
• Water-cement ratio- 0.4 to 0.6
• High strength concrete- as low as 0.21
• Hydration process- calcium silicate Hydrate
• Heat of hydration
![Page 5: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/5.jpg)
Aggregate
• 65 to 75% volume
• Coarse aggregate- stone chips, brick chips, gravel
• Fine aggregate- sand
• Concrete unit weight -140 to 152 pcf, 145pcf
• Lightweight aggregate-shale, slate, slags, brick chips
• Heavy weight aggregate
• Recycled concrete
![Page 6: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/6.jpg)
• Proportioning and mixing
• Conveying, Placing, compacting and curing
![Page 7: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/7.jpg)
Quality Control
![Page 8: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/8.jpg)
Admixtures
• To improve concrete performance
• Air-entraining
• Accelerating
• Set Retarding
• Plasticizer, super plasticizers
• Viscosity modifying-self compacting
![Page 9: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/9.jpg)
Properties in Compression
![Page 10: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/10.jpg)
Poisson’s ratio 0.15 to 0.20
![Page 11: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/11.jpg)
Creep
![Page 12: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/12.jpg)
Properties in tension
![Page 13: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/13.jpg)
High strength concrete
• 8 to 20 ksi or higher
• High performance concrete
![Page 14: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/14.jpg)
ReinforcementStrong Bond-no slip
![Page 15: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/15.jpg)
Reinforcing Bars
![Page 16: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/16.jpg)
Stress strain curves
TMT bars
![Page 17: Chapter2](https://reader034.fdocuments.net/reader034/viewer/2022051112/557cb00bd8b42a9c528b48f6/html5/thumbnails/17.jpg)
Prestressing steel