Special Types of Concrete.pptx

Special Types of ConcreteDesign and Control of Concrete Mixtures – Chapter 20

Overview Lightweight

Concrete High Density

Concrete Mass Concrete No-Slump and

Roller-Compacted Concrete

Soil-Cement

Shotcrete Pervious Concrete White and

Colored Concrete Photocatalytic

Concrete

Structural Lightweight Aggregate Concrete

Structural Lightweight Aggregate Concrete

Structural Lightweight Aggregate Concrete

Mixing Similar to normal-weight concrete Aggregates may need prewetting

Workability Lightweight concrete exhibits better workability

for a given slump Finishing

Generally starts earlier Curing

Similar curing – added benefit of internal curing

Insulating and Moderate-Strength Lightweight Concretes

Insulating and Moderate-Strength Lightweight Concretes

Autoclaved Cellular Concrete

High-Density Concrete

Mass Concrete

Mass Concrete

Mass Concrete

Mass Concrete

No-Slump Concrete Defined by slump less than 6 mm ( ¼

in.) Slump cone is impractical

Vebe apparatus Compacting-factor test Thaulow drop table

Air entrainment is still used for freeze-thaw resistance

Roller-Compacted Concrete

Soil-Cement

Shotcrete

Pervious Concrete

White Concrete

Colored Concrete

Photocatalytic Concrete Titanium-based additions act as

catalysts in sunlight Breaks down pollution into oxygen,

water, CO2, nitrate, sulfate Well-suited for structures with high sun

exposure Can be used for streets

Study shows NOx reduction of 25-45% over control pavement

Overview Lightweight

Concrete High Density

Concrete Mass Concrete No-Slump and

Roller-Compacted Concrete

Soil-Cement

Shotcrete Pervious Concrete White and

Colored Concrete Photocatalytic

Concrete

Questions

?