Formwork is used to hold the concrete in its shape until it has firmed up. It is important to have formwork that is sturdy enough to carry the concrete’s weight. Formwork can be made from a variety of materials, including timber, plastic, and fiberglass. Whether you purchase new or used forms, it’s a good idea to consider their quality.
When choosing formwork, choose something that is sturdy, easy to install, and low cost. Also, take care to ensure that all joints are leakproof. Formwork that is not properly treated may be susceptible to discoloration, so it’s important to keep it free of debris. You also want to ensure that the inside surface is smooth. This will prevent mold from forming on it.
Formwork can be constructed on site using prefabricated plastic forms or a crane. If the form is made from steel, it’s easy to dismantle and reassemble. Steel concrete forms are also more durable than other formwork materials. They can be used on multiple projects. However, they also increase the initial cost.
In addition to durability, steel formwork is flexible, which allows for the casting of special shapes. The material is also resistant to water, which helps reduce shrinkage in the concrete. A concrete formwork system is usually shipped to a job site in component pieces and assembled on the job site.
Besides the material you choose, you should also pay attention to the size and shape of your formwork. Ideally, your formwork will be taller than the height of the walls of your structure. Having a gap of about seven to ten centimeters is ideal. That’s because the poured concrete will exert lateral pressure as it rises. Using a sand cushion to spread the weight of the concrete evenly is a good way to make sure your structure is balanced.
Another consideration is the amount of pressure the formwork will be exposed to. Depending on the type of concrete and pouring temperature, the pressure will vary. For instance, if you’re building a 12-foot-tall wall, it would take about three hours for the full pour.
Once you’ve selected a formwork system, it’s a good idea to consult with a form designer before you start construction. He or she can help you select the right type of formwork and work with you to minimize the risk of accidents.
Before you begin your project, prepare a foundation for the area where you’re going to put the concrete. Be sure to follow the rules of your local code. After the concrete has cured, remove the formwork gradually. While doing so, clean the surface and apply a release agent to the interior. If the forms are not treated, it can lead to the formation of molds and cause the concrete to discolor.
During the concrete’s setting process, it can break or crumble, so it’s essential to make sure your formwork is rigid. As well, it should be waterproof. Several types of formwork can be used, including steel, plywood, and fiberglass.
