Precast concrete is a type of construction in which concrete is cast in a reuseable mould. Then it is left to dry in a precast facility under regulated conditions. The structural component is subsequently brought to the construction site and put into place. Precast concrete can be used to build structural elements such as concrete walls, floors, and frames.
Advantages
- Saves Construction Time – Construction using precast concrete is faster and less likely to experience project delays. Precast concrete casting can be done concurrently with other site activities, such as earthwork, surveying, etc., saving time.
- Usage Of Prestressed Concrete – Pre-stressed precast allows for the creation of structural materials with high strength and load-bearing capacity. Therefore increasing clear span and reducing the size of structural parts’ cross-sections, among other benefits.
- Aesthetics – The structures can use a variety of colour and texture combinations because they are prefabricated in a regulated manufacturing setting. There is a large variety of forms and sizes to pick from with smooth finishing. These will increase the aesthetic value of products.
- Cost-effective – Time is saved, productivity is increased, quality is improved, and safety is improved, which lowers cost.
- Durability – These structures last longer and require less maintenance. The high-density precast concrete is more resistant to dust buildup and is more resistant to acid attack, corrosion, impact, and surface gaps.
- Quality Assurance – This type of concrete can be monitored for the main elements that control building quality. These include curing, temperature, mix design, formwork, etc. Therefore, higher-quality building can be done.
- Safe Construction Platform – For the building of precast concrete, no raw materials need to be kept on site. By lowering the need for conventional formworks and props, waste, labour, etc., it creates a safe working environment.
Disadvantages
- Modification – Limitation It is challenging to change precast constructions, hence this is a limitation. For instance, removing a structural wall for renovation will affect the building’s overall stability.
- High Initial Investment – Heavy and sophisticated equipment is required for the installation of a precast concrete plant, which comes with a hefty initial expenditure. To guarantee a suitable return, a substantial number of precast construction projects must be accessible.
- Handling Difficulties – When handling the concrete, proper attention and care must be taken. Precast members are typically huge and heavy, making them challenging to handle without damaging them. Precast members are typically handled by portable or tower cranes.
- Sensitive Connection Works – One of the most important aspects of maintaining good structural behaviour is the assembly of the precast members. To assure the intended behaviour of a connection, such as a simple, semi-rigid, or stiff connection, it is necessary to supervise and properly complete connections between many structural parts. In addition to this, bad connections might cause sound insulation failure and water leaks.
- Transportation Issues – The precast concrete plant’s location may be far from the construction site. In that instance, trailers must be used to transport the precast members to the construction site. The transportation expense frequently makes up for the lower costs of precast concrete.
