Precast concrete is used in many types of structures including those serving commercial, multi-unit residential, and industrial uses. Hollow core prestressed slabs (or planks) are one type of precast concrete that is used primarily for flooring systems. These planks have advantages of being able to span long distances while being relatively thin and light when compared with cast in place concrete solutions while being economically advantageous to manufactures and builders due to their ease of production.
Hollow core planks are used as floor systems in some structures. These planks are precast offsite of the structure and shipped to the building site for installation. They rely on the use of prestressing steel to help span large distances with minimal depth. The planks have several large voids in the interior of the concrete cross-section which results in a lower weight, more efficient structural element. These voids can cause strength problems in some circumstances, but this is mitigated by selectively filling the voids with concrete after casting of the planks.
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