Depending on your particular needs, you may choose to go with one over the other. Because on-site concrete pouring is custom to the build, it is incredibly versatile. = However, it is also far more costly, labor-intensive, and time-intensive. While precast concrete does have to be hauled to location, its unparalleled quality, affordability, and longevity make it stand out against its on-site competitors.
It is poured and molded over rebar or wire and then cured offsite. This involves pouring concrete into pre-made molds and then cured under ideal conditions within the manufacturing plant itself. Once hardened and ready for use, those preformed concrete products are shipped to the job site where they are assembled into the desired structure. = As opposed to precast, site cast, sometimes known as in-situ concrete, is poured, molded and cured on site. Like precast concrete, on site concrete is formed in a mold and then lifted in place.
Precast & cast-in-situ concrete are the product produced by casting concrete in a mould or formwork cured to get the strength of RCC elements. The precast concrete is transported to the construction site, lifted and positioned at the predetermined place. = The cast-in-situ concrete is a standard concrete which is poured into the specific formwork on the site and cured to get the strength of RCC elements.
In the precast concrete elements are manufactured in a controlled casting environment and hence it is easier to control mix, placement and curing. Elements can be cast in advance and held until the hour you need them, thereby saving time. Weather condition has no effect on casting work. = In the cast-in-situ concrete, column, slab etc. elements are cast on site in the open environment and hence it is difficult to control mix, placement and curing. Elements cannot be casted in advance. Weather conditions can delay the casting work.
It is a cheaper form of construction if large structures are to be constructed.= In situ concrete is cheaper form of construction for small structures.
Precast concrete requires heavy machinery and cranes for handling and installation of heavy elements. A skilled and technical contractor is required for the construction of the precast concrete structure. = Cast-in-situ concrete does not require such handling equipment, More labours are required for this at the construction site.
Precast concrete construction is quick as it can be installed immediately and there is no waiting for it to gain strength. Increase in strength can be achieved by accelerated curing. = In situ concrete construction is slow as gaining of strength requires time. Increase in strength at situ by accelerated curing is a difficult task.
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