How Precast Concrete is Made?
Precast concrete is a building product produced by pouring concrete in a reusable mold or "formwork" and then cured in a controlled environment, transported to the construction site and lifted into place ("tilt up"). In contrast, standard concrete is poured into a site-specific form and cured on site. Prefabricated stone differs from precast concrete in which fine aggregate is used in concrete, so that the final product approaches the appearance of natural rock or stone.
Prefabricated (panels) are only used in the area of exterior walls and interior walls. Compresses on concrete and stones to create a solid yet manageable wall or face. By producing precast concrete (usually called prefabricated devices) in a controlled environment, precast concrete has the opportunity to be properly cured and closely monitored by plant employees. The use of precast concrete systems offers many potential advantages over in-situ casting. Precast concrete production can be done on the ground, which helps the safety of the entire project. Compared with construction sites, precast plants have greater control over material quality and processes. Templates used in prefabricated plants can be reused hundreds to thousands of times before being reused, often making them cheaper than on-site casting when looking at the cost per unit template.
Many state and federal transportation projects in the United States require precast concrete suppliers to be certified by the Building Prefabrication Association (APA), the National Precast Concrete Association (NPCA) or the Precast Prestressed Concrete Association (PCI).
There are many different types of prefabricated concrete forming systems for construction, which vary in size, function, and cost. Prefabricated building panels are also used to cover all or part of a building's exterior walls or separate walls for beautifying the environment, soundproofing and security walls, some of which may be prestressed concrete structural members. Rainwater drainage, water and sewage pipes and tunnels use precast concrete units.