10 traffic safety act

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