Recycled Aggregates in Construction

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14 Terms

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Aggregates

Granular material used in concrete, asphalt, and mortar.

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Sand

Type of aggregate < 4.75 mm in size.

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Stone or gravel

Type of aggregate > 4.75 mm in size.

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Significance of Aggregates

Impact on strength, workability, cost, stability, and environmental footprint.

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Natural Sources of Aggregates

Include gravel pits, river run deposits, and rock quarries.

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Manufactured Aggregate

Includes blast furnace slag, steel furnace slag, fly ash, and furnace bottom ash.

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Recycled Aggregate

Materials recovered and reprocessed from previous construction or demolition activities.

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Benefits of Recycled Aggregates

Waste reduction, resource conservation, cost savings, reduced carbon footprint, tax incentives.

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Common Applications of Aggregates

Concrete production, road construction, landscaping, structural use, etc.

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Production Process - Sourcing

Involves collecting construction and demolition waste.

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Production Process - Recycling Facility

Includes crushers, vibrating screens, magnetic separators, and water floating machines.

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Recycled Aggregate in Normal Concrete

Usage limited or prohibited, up to 50% natural aggregate in SA.

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Recycled Aggregate in Bricks and Blocks

Features low strength, cost-effectiveness, and reduced cement and water usage.

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Limitations and Challenges

Include variability, inconsistent quality, slow acceptance, perception issues, regulatory hurdles, and lack of standards.