10 traffic safety act
TRANSCRIPT
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Special Types of Concrete
CVLE 519
Concrete Technology
Dr. Adel El Kordi
Professor
Civil and Environmental Engineering
Department
Faculty of Engineering
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Special Types of Concrete Using Portland Cement
1. Architectural concrete
2. Colored concrete
3. Dry-packed concrete
4. Ferrocement
5. Gap-graded concrete
6. Heavyweight concrete
7. High-performance concrete
8. Insulating concrete
9. Lightweight concrete
10. Mass concrete
11. No-slump concrete
12. Polymer-modified concrete
13. Pervious concrete
14. Prepacked concrete
15. Preplaced aggregate concrete
16. Reactive-powder concrete
17. Recycled concrete
18. Roller-compacted concrete
19. Self-consolidating concrete
20. Shotcrete
21. Soil-cement
22. Tremie concrete
23. Vacuum-treated concrete
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Structural Lightweight Concrete
Air-dry density:
1350 to 1850 kg/m3
28-day compressive strength:
> 17 MPa .
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Structural Lightweight Aggregates
Rotary kiln expanded
clays, shales, and slates
Expanded shales and
slates
Pelletized or extruded fly
ash
Expanded slags
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Structural Lightweight ConcreteStrength vs. Cement Content
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Insulating Concrete
Oven dry density:240 to 800 kg/m3
Compressive strength: 0.7 to 7 Mpa
Air Content = 25 – 35%
Primary uses:
Thermal and sound insulation, roof decks, fill for slab-on-grade subbases, leveling courses for floors or roofs, firewalls, and underground thermal conduit linings.
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Moderate-Strength Lightweight Concrete
Oven dry density:800 to 1900 kg/m3
Compressive strength: 7 to 15 Mpa
Primary uses:
Lower densities: insulation and fill
Higher densities: walls, floors and
roofs
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Thermal Resistance
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Sanded Cellular ConcretesCompressive Strength vs. Density
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Autoclaved Cellular Concrete
Production:
Mortar + gas forming
admixture
Pressure steam cured
(autoclaved)
Block or panel form
Density:
300 to 1000 kg/m3
Compressive strength:
2.5 to 10 MPa
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Mass Concrete
Any large volume of cast-in-place concrete with dimensions large enough to require that measures be taken to cope with the generation of heat and attendant volume change to minimize cracking. (ACI 116)
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“Low-Heat” High-Strength Mass Concrete
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Potential for Surface Cracking in Mass
Concrete
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Roller-Compacted Concrete (RCC)
1. Lean
2. No-slump
3. Almost dry
4. Compacted in place by
vibratory roller or plate
compaction
equipment.
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RCC—Water Control Structures
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RCC—Pavements
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Soil-Cement
Four steps of soil
cement construction:
1. Spreading cement
2. Mixing
3. Compaction
4. Curing
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White and Colored Concrete
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