special types of concrete.pptx
TRANSCRIPT
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Special Types of ConcreteDesign and Control of Concrete Mixtures – Chapter 20
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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
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Structural Lightweight Aggregate Concrete
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Structural Lightweight Aggregate Concrete
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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
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Insulating and Moderate-Strength Lightweight Concretes
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Insulating and Moderate-Strength Lightweight Concretes
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Autoclaved Cellular Concrete
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High-Density Concrete
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Mass Concrete
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Mass Concrete
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Mass Concrete
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Mass Concrete
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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
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Roller-Compacted Concrete
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Soil-Cement
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Shotcrete
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Pervious Concrete
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White Concrete
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Colored Concrete
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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
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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
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Questions
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