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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
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
2
Structural Lightweight Concrete
Air-dry density:
1350 to 1850 kg/m3
28-day compressive strength:
> 17 MPa .
3
Structural Lightweight Aggregates
Rotary kiln expanded
clays, shales, and slates
Expanded shales and
slates
Pelletized or extruded fly
ash
Expanded slags
4
Structural Lightweight ConcreteStrength vs. Cement Content
5
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.
6
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
7
Thermal Resistance
8
Sanded Cellular ConcretesCompressive Strength vs. Density
9
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
10
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)
11
“Low-Heat” High-Strength Mass Concrete
12
Potential for Surface Cracking in Mass
Concrete
13
Roller-Compacted Concrete (RCC)
1. Lean
2. No-slump
3. Almost dry
4. Compacted in place by
vibratory roller or plate
compaction
equipment.
14
RCC—Water Control Structures
15
RCC—Pavements
16
Soil-Cement
Four steps of soil
cement construction:
1. Spreading cement
2. Mixing
3. Compaction
4. Curing
• 17
White and Colored Concrete
18