MATERIAL USED FOR FORMWORK.
This is the most common material used for formwork construction. It is easy to work with and is also cheap. The moisture content of timber should be between 15%- 20%. So if the timber is dry, it will absorb moisture from the wet concrete that could weaken the resultant concrete member.
Strong thin board made by gloving layers with the direction of grain alternative. Plywood is widely used to construct formwork because it is strong; light weighted and supplied in easy handling sizes. The plywood sheet sizes available at site are 900mm x 2400mm and 1200mm x 2400mm. The thicknesses of plywood sheets are 12mm,10mm or 18mm.
Steel also widely used material for constructing formwork nowadays. The smooth surface of steel is helpful to remove formwork easily and the concrete surface is pleasing and finished smooth. Steel formwork is strong enough to bare the load of the concrete & it is no doubt about the strength. Although the strength and finishing surface is much more it is somewhat difficult to handle the steel shutters. This is because of the weight of the large steel formwork. In our site we use steel plates to construct coloumns. They are called Docka plates and the procedure of that system is called Docka system.
It is a modern formwork system extreamly durable and robust made with hot dip galvanization. It is very strong and takes heavy loads. Docka specially easy and manufactured by experienced specialists. There are variable hights of Docka plates. There is a Docka factory in Europe. Tabelforms load towers and even stairs towers can be constructed with it and for upper construction and supporting structure for every height.There are 0.9, 1.2, 1.8m, heights. Concrete walls can be constructed easily.