Advantages of Precast Concrete and Disadvantages its Uses
Why use precast concrete?
There are many benefits associated with the use of precast concrete components. Of course these require proper design, use of the correct materials and manufacturing processes with skilled and knowledgeable personnel. Benefits available include:-
Quality , Durability, Dimensional accuracy, Tight tolerances, Speed of construction,Reduction of on site labour, Reduction of on site activity, noise, and disturbance, Reduction of on site waste, Low life cycle cost,Minimal maintenance Non , Combustible, Fire rated, Not subject to rot, Acoustic insulation, Thermal inertia reduces lifetime energy costs, Sandwich panels available for insulation,. Large spans available from prestressing
These impact on all parties providing benefits for the architect, engineer, builder, developer, and owner.The benefits are many, including financial gains from shorter construction times and earlier occupation.
Advantages of Precast Concrete
The concrete of superior quality is produced as it is possible to have better technical control on the production of concrete in factory. It is not necessary to provide joints in the precast construction.
The labour required in the manufacturing process of the precast units can easily be trained.The moulds employed for preparing the precast units are of steel with exact dimension in all directions. These moulds are more durable and they can be used several times.
The precast articles may be given the desired shape and finish with accuracy.The precast structures can be dismantled, when required and they can then be suitably used else where.
The transport and storage of various components of concrete for cast in situ work are eliminated when precast members are adopted.The work can be completed in a short time, when precast units are adopted.When precast structures are to be installed, it is evident that the amount of scaffolding and formwork is considerably reduced.
Disadvantages of Precast Concrete
If not properly handled, the precast units may be damaged during transport.
It becomes difficult to produce satisfactory connections between the precast members.It is necessary to arrange for special equipment for lifting and moving of the precast units.
The economy achieved in precast construction is partially balanced by the amount to be spent in transport and handling of precast members. It becomes therefore necessary to locate the precast factory at such a place that transport and handling charges are brought down to the minimum possible extent.