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You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter calaguala Start date Apr 21, Hello, I'd like to understand and translate the difference between precast concrete and prefabricated concrete: "the company provides a full line of precast and prefabricated foundations".
Thank you. Once on-site, the truck will place the concrete directly in the final position if it is able to get close enough to access it, otherwise, the concrete is placed in a pour bucket or into a concrete pump truck.
A pour bucket may be moved with a crane or excavator to its destination while a pump truck can pump the concrete through piping vertically or horizontally up to around feet away. Common uses of the cast-in-place method include parking lots, road paving, and housing foundations.
Precast concrete structures are prefabricated and cured off-site. Precast structures are fabricated in a similar fashion as cast-in-place structures, except they are fabricated prior to installation in a manufacturing plant.
Common structures precast include wall panels, trenches, staircases, septic tanks, grease traps, bridge beams, box culvert, and pipe. The process of concrete construction using the cast-in-place method is virtually the same for all underground concrete structures. Here are the basics steps. The process of concrete construction using precast concrete structures is similar to cast-in-place with the exception that many of the steps are done offsite. Although the installation steps for precast concrete structures appear minimal, much of the fabrication process is being done offsite prior to installation.
Here are the typical steps in the manufacturing process that will not be seen on the job site. Cast-in-place is often the first choice when pouring foundations or slabs and it is often used when building large bridge column supports and roads. It can also be used when building walls and roofs. Because precast structures are already fabricated prior to arriving at the job site, they are not as adaptable as casting a structure in-place.
If a precast structure is brought to a job site and the dimensions are not compatible with the prepared area, then the precast structure may have to be modified or not used at all. In other situations, there may be concerns with having joints within a structure, such as a containment sump with hazardous liquids.
Precast structures often require multiple sections and joints within the structure. Although there are many joint sealants and liners to provide a watertight structure, the cast-in-place method can oftentimes avoid this concern.
Precast concrete structures can also be challenging to handle because they can be heavy and extremely large. For this reason, cranes or larger equipment are typically needed to offload and place the precast structure into place.
There is no need for this extra equipment in the cast-in-place construction process. Casting structures in-place may also be more advantageous when working in a tight or restricted job site condition. It can be difficult to lift and place a precast structure when overhead obstructions are present or working inside a building or parking garage. Other inherent challenges with the precast concrete construction method are discussed in more detail here.
Precast concrete does have its advantages. One being that it is made in a controlled environment. This means more quality controls are present with concrete batching, dimensions, and inspections. Most precast manufacturers have certified technicians and engineers to monitor and aid the team during the production process. Another major advantage with prefabricating any structures, including concrete, is the reduced delays brought on by bad weather conditions.
Most precast facilities are indoors and will continue producing product even during bad weather conditions that will typically shut down a jobsite. During the installation process, the precast method may only take a few hours to install versus the cast-in-place method taking weeks or months.
Particularly in regions with frequent rain events, precast can reduce a project duration by months minimizing the time an excavation is open.
This means less water pumping, less mucking out, and less time renting safety equipment associated with open excavations. Labor management is also greatly reduced when working with precast structures. Often the cast-in-place method requires multiple trades and inspectors to be managed throughout the process.
This means more safety orientations, training, management oversight and HR management that is avoided with precast construction. The construction methods utilizing precast concrete and cast-in-place concrete both serve important roles in construction and they both have their advantages and disadvantages.
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