What are the typical uses and characteristics of Architectural Precast Concrete?

Architectural Precast Concrete, outlined in section 03450, is primarily utilized for structural components such as large wall panels, columns, spandrels, and other members that require an architectural finish. This material is composed of white or grey cement and graded sieve aggregates, usually 1” or smaller, achieving a compression strength of around 5000 psi after 28 days. Installation is often managed by the producing company or a specialized steel or precast erection company, adhering to standards set by the Precast/Prestressed Concrete Institute (PCI).

 

Unlike typical masonry products, Architectural Precast is generally used in the form of extensive curtain wall panel units or large spandrel members. It features a mixture of various colored aggregates and a wet sand-cement slurry that is poured into molds. The surface is typically sandblasted or chemically treated to expose the aggregates, creating a distinctive, pebbly finish. This form of precast concrete is ideal for large-scale projects where crane installation is possible and the aesthetic of natural stone is not a primary concern.