Lightweight Aggregate

Definition

Aggregate of low specific gravity, such as expanded or sintered clay, shale, slate, diatomaceous shale, perlite, vermiculite, or slag; natural pumice, scoria, volcanic cinders, tuff, and diatomite, sintered fly ash or industrial cinders. Used to produce lightweight concrete. Aggregate with a dry, loose weight of 70 pounds per cubic foot or less.

Purpose

Lightweight aggregate is used to produce lightweight concrete, which has a lower density and improved thermal and acoustic properties compared to standard concrete. This makes it suitable for applications where weight reduction is crucial.

Examples of Use

• High-rise buildings: Reducing the overall weight of the structure to lessen the load on foundations.
• Bridges: Minimizing dead load to enhance structural efficiency and reduce construction costs.
• Insulating concrete: Providing thermal insulation and fire resistance in buildings.

Related Terms

• Concrete: A composite material made from cement, aggregate, and water.
• Thermal Insulation: Materials or methods used to reduce heat transfer.
• Acoustic Insulation: Materials or methods used to reduce sound transmission.

Notes

• Lightweight aggregates can improve the workability and pumpability of concrete.
• They are often used in precast concrete products and in-situ concrete applications.
• The specific type of lightweight aggregate used depends on the desired properties of the final concrete product.