The Constructor

Plastic Formworks for Concrete – Applications and Advantages in Construction

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Use of plastic formworks for concrete construction has many advantages such as durability, cost and flexibility compared to other materials for concrete formworks. Formworks are used to hold freshly placed concrete at its position until it attains enough strength and with the help of formworks concrete can be easily manipulated and various shapes and forms can be constructed. There are different materials which may be used to manufacture formworks for example timber, steel, and aluminum in addition to plastic that offer number of advantages compared to other materials for example durability, cost effectiveness, and flexibility. It is reported that, not only does the construction of formworks takes time but also spent about 20 to 25% of the total cost of the structure. It is one of the major factors that influence the success of construction of any structure in terms of safety, cost, quality and speed. It is for these advantages and benefits of plastic forms that will be discussed in the following sections.

Fig.1: Plastic Formwork for Concrete Construction

Objectives of Plastic Formworks in Concrete Construction

Form work is not a permanent construction but it requires careful attention to avoid damages of permanent construction. The formwork design and construction are controlled by three principles:

Advantages of Plastic Formworks in Concrete Construction

Formworks expend large labor force and total cost of the project that is why efforts have made to introducing a formwork system that is cost effective and can be assembled, dismantled and handled easily by labor. There are several advantages provided by plastic formworks in concrete construction:

Plastic Formwork System

It is manufactured from specific grade plastic that neither placed materials adhered to it nor chemical reactions occur between poured materials and the plastic form and consequently there will be no any patch on the surface of reinforced concrete element. Water or freshly placed concrete leakages from different parts of the form is avoided because of the perfect fitness of various parts of the system. Added to that, it is most labor friendly system because not only does it fit and plugged easily but also it is considerably light weight compare with other types of formwork systems. Nailing and oiling plates are not required prior to concreting because of auto leveling of plugging system that make plates level automatically and consequently it takes about 30% lesser time during installing and dismantling compare with conventional form systems. Additionally, after its utilization, the plastic forms can be cleaned with water easily and if it breaks due to bad handling, low voltage hot air gun is used to seal it. Other formwork materials such as wood, steel, aluminum produce various disadvantages which might outweigh their benefits. For example, the application of wood is considerably costly and create substantial environmental impacts due to deforestation. With regard to aluminum formworks, it can be employed many times but its high cost makes it as not very suitable option to use. In contrary, plastic forms can be recycled and it is environmentally friendly in addition to reduce handling time and great reusability index. Table-1 provides a comparison between plastic forms and other form types. Table-1: Comparison Between Plastic, Traditional, And Steel Formworks
Items Plastic formwork Traditional formwork Steel formwork
Recycled 40% No 10%
Water resistant Yes No No
Deformation condition No Yes Yes
Stripping process Easy Moderate Difficult
Size Any size can supply Restricted Restricted
Corrosion resistant Excellent Bad Bad
Availability time More than 100 times 8 times 100 times

Different Types of Commercially Available Plastic Formworks

Siscon Plastic Formwork System

It is one type of commercially available plastic form which can be used to construction various structural elements such as walls, columns, and slabs. It provides substantial precision.

Plastic Formworks for Walls

It is used for the construction of boundary walls, retaining walls, shear walls, rainwater drains, flood or storm drain walls, irrigation canals, and in concrete banking.

Fig.2: Wall Plastic Formwork Applications at Different Location of the Structure

Fig.3: Plastic Formworks used for Wall Construction

Plastic Formworks for Floors

Fig.4: Plastic Formwork for Concrete Floor Concrete

Fig.5: Plastic Formwork for Slab Construction

Plastic Formworks for Column

Fig.6: Installation of Plastic Formwork for Column

Nova Plastic Formwork System

It is produced from composite plastic material and it is the only plastic form that can be employed in both salt and fresh water without damage. Various applications of NOVA plastic forms are shown in Figure-7, Figure-8, and Figure-9.

Fig.7: Application of Nova Plastic Forms

Fig.8: Application of Nova Plastic Form in the Construction of Column

Fig.9: Use of Nova Plastic Form in Construction of Concrete Walls

  Read More: Types of Formwork (Shuttering) for Concrete Construction Concrete Formwork Design Considerations – Basis for Concrete Formwork Design Wooden Concrete Formwork Design Criteria with Calculation Formulas Concrete Formwork Loads and Pressure Calculations Formwork Removal Time & Specifications Measurement of Formworks Formwork (Shuttering) for Different Structural Members -Beams, Slabs etc Formwork Safe Practices Checklist
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