Concrete Form.work

Controlling the cross-section of the flexible shaped beam is the key to a design with little material input. The basic assumption is that a flexible, permeable fabric slab is kept in a failed work system before reinforcement and concrete are added. By varying the geometry of the fabric shape with the distance along the beam, the optimized shape is created. Flexible formwork therefore has the potential to facilitate the change in design and construction philosophy needed to move to a less material-intensive and more sustainable construction industry. Its potential is further demonstrated in Lee`s work. [8] Fabric formwork is a small niche in concrete technology. It uses soft and flexible materials against fresh concrete as formwork, usually with some kind of very tight textile or plastic material. The International Society of Fabric Forming conducts research on fabric formwork. [9] Poured concrete is a viscous solution that can take up to 48 hours to settle properly. During the setting time, the concrete must be contained in a concrete form. Concrete molds or formwork are the materials or load-bearing shapes used when working with concrete. They also determine the final shape of the concrete, since the liquid takes the shape of its container. If you choose Conco concrete formwork, we offer: By replacing conventional shapes with a flexible system consisting mainly of cost-effective sheets of fabric, flexible formwork uses the fluidity of concrete to create highly optimized and architecturally interesting forms of construction.

Significant material savings can be achieved. [7] The optimized section provides ultimate limit state capacity while reducing embodied carbon, thereby improving the life cycle performance of the entire structure. Some of the earliest examples of concrete slabs were built by Roman engineers. Since concrete is quite resistant to compressive loads, but has a relatively low tensile or torsional strength, these early structures consisted of arches, vaults, and domes. The most remarkable concrete structure of this period is the Pantheon of Rome. To form this structure, temporary scaffolding and incorrect work was built in the future form of the structure. These construction techniques were not limited to pouring concrete, but were and are widely used in masonry. Due to the complexity and limited production capacity of the building material, the rise of concrete as the preferred building material did not occur until the invention of Portland cement (and developments by the Edison Portland Cement Company) and reinforced concrete. This formwork is designed to remain solid after the concrete hardens and acts as axial and push reinforcement. This formwork is made on site from prefabricated plastic molds reinforced with fibers. It is mainly used in pillars and columns and also offers resistance to corrosion and other types of environmental damage. Concrete is one of the most commonly used building materials thanks to its exceptional properties.

However, in order to create building elements with concrete, it must be poured into a specially designed mold. This is called formwork or formwork. Formwork requires structures such as rods and stabilizers to prevent movement during the construction process, and these are called defective work. To ensure high quality when working with concrete, skilled workers and adequate supervision are needed. Formwork can use temporary or permanent molds that keep the poured concrete in shape until it hardens and reaches enough strength to support itself. Formwork can be classified in several ways: in the case of removable forms, as soon as the concrete has been poured into the formwork and hardened (or hardened), the formwork is beaten or stripped (removed) to expose the finished concrete. The time between casting and stripping the formwork depends on the specifications of the work, the hardening required and whether the mold is weighted, but is usually at least 24 hours after the end of the casting. For example, the California Department of Transportation requires forms to be in place for 1-7 days after watering,[10] while the Washington State Department of Transportation requires forms to remain in place for 3 days with wet coverage outside.

[11] These systems consist of prefabricated wooden, steel or aluminum beams and formwork modules. The modules are often no larger than 3 to 6 feet or 1 to 2 meters high. Beams and formwork are usually set by hand and pinned, clipped or screwed together. The advantages of a modular system are: does not require a crane to place the formwork, construction speed with unskilled work, the formwork modules can be removed according to concrete sets, so that only the beams remain in place before structural strength is achieved. Concrete is regularly used in construction projects. For example, it can be poured to create supports for a fence or gate, or as a foundation for a new shed. However, when concrete is initially mixed, it is not a rigid compound that retains an unaided shape. It is a thick, viscous liquid that is difficult to mix and difficult to handle without using concrete molds. If the formwork is removable, the process should not damage the concrete. Wet concrete also exerts hydrostatic pressure on the formwork.

The pressure at the bottom of the form is therefore greater than at the top. In the illustration of the column formwork on the right, the „column clamps“ are closer together at the bottom. Note that the column is tightened with adjustable steel „formwork brackets“ and uses 20mm „through screws“ to further support the longitudinal side of the column. For best results, invest in a wood formwork that is easy to work, light and well dried. Also make sure the wood doesn`t have loose branches that could come out and let wet concrete seep through the hole. Although there is a probability that the wooden formwork will deform when it absorbs water from the concrete, this effect can be limited by treating the wooden molds with a joint. Another type of material used to make formwork is resin-bonded plywood. These plywood panels are usually attached to wooden frames to create large, inexpensive concrete molds.

However, plywood is less durable and rarely reusable. Fiberglass concrete molds are best suited for projects with curved surfaces, although they are expensive and often need to be ordered individually. All load-bearing systems must be height adjustable so that the formwork can be placed at the right height and removed after the concrete has hardened. To support these systems, adjustable metal supports are usually used that resemble (or match) those of beamed ceiling formwork. Some systems combine spars and supports to form steel or aluminum trusses. Still other systems use metal-frame shoring towers to which the bridges are attached. .