When forming curves in concrete, there are a few different forms that can be used depending on the type of curve being formed. Generally, the preferred choice for large curves is a form that uses pre-fabricated formwork.
This usually consists of a series of 2x4s and plywood sections that are fitted together. This is the most cost effective way of forming large and complex curves.
For smaller or simpler curves, there are several form options that may be used. One form type uses a flexible plywood or steel-reinforced flexible fabric that can be cut and bent to the desired shape.
This type of form is often used to form shallow curves as well as decorative curves such as steps. This form is usually used in conjunction with steel or plastic spacers.
An alternative form type is the flexible rubber membranes that are placed over the area requiring a curve to be formed. The membrane is then inflated with air or water and the concrete is poured into the area.
This is a more expensive and involved process, but it can be used to create extremely precise and complex curves.
Finally, it is also possible to pour concrete directly into an excavation site and use a handheld float to create the desired shape. This is the least precise method of forming curves from concrete, but it is typically used for smaller curves and can still achieve fairly accurate results.
How do you make a concrete round?
Making a round concrete shape is relatively easy and can be done in a few steps.
First, you’ll need to create a frame in the shape of the concrete round that you want. It should be slightly bigger than the desired size to allow for the concrete to be poured and spread evenly. You can use anything from wood to metal to make the frame, as long as it can contain the concrete.
Once you have the frame in place, mix your concrete according to the instructions on the bag. Place several layers of medium-gauge welded wire mesh in the form and pour in the concrete up to the top of the form.
You’ll want to ensure the mesh is properly in place before pouring in the concrete.
Next, you’ll need to smooth out your round concrete piece using a trowel or a flat-edged shovel. Make sure to spread out the concrete as evenly as possible and create a slight slope around the edges.
Allow your round concrete piece to dry for at least 24 hours before removing the frame. If you want to make sure your concrete round is extra strong, you can add a coat of sealant onto it before you remove the frame.
Once the concrete has set, you can use a saw to cut out any access or to create any other decorative elements before polishing.
Your concrete round is now ready to be used, whether it’s as a stepping-stone in a garden, a decorative piece on a porch, or anything else you might need it for.
What type of plywood is used for concrete forms?
The most common type of plywood used for concrete forms is exterior grade plywood, which is typically made with an odd number of layers of external birch or Douglas fir veneers. Exterior grade plywood is rated for outdoor use and is typically manufactured with waterproof resins and glues, making it an ideal choice for use in concrete forms.
The plywood should also be treated to ensure it is not affected by moisture during the concrete pour. It is also important to select plywood with the correct thickness for the job, typically at least 5/8” thick, so it can withstand the pressure of the concrete during the pour.
Thinner plywood may be adequate for light duty work, however if you plan to keep the concrete forms in place for an extended period of time it is important to use a thicker and higher grade plywood to ensure the forms will not move, warp, or shift during the pour.
What is the material for concrete forms?
Concrete forms help to shape the poured concrete and keeping it in the desired shape until it hardens. The material for concrete forms can vary depending on the application and purpose of the form. Common materials used for concrete forms include steel, aluminum, corrugated plastic, fiber-reinforced plastic, plywood, and/or a combination of these materials.
Steel and aluminum are strong and durable materials, making them one of the most popular materials used for concrete forms. Plywood is a more lightweight material compared to metal, which makes it easier to install, but plywood can suffer from warping or rotting after repeated exposure to moisture.
Corrugated plastic or fiber-reinforced plastic are typically the preferred choice for short-term or temporary concrete forms as they are relatively lightweight and easy to store. Additionally, these materials do not require any additional treatment or protection to prevent warping or rotting.
Can I use pressure treated lumber for concrete forms?
Yes, you can use pressure-treated lumber for concrete forms, although it is not the ideal material for concrete forms due to its propensity to swell and warp when exposed to high moisture levels. Pressure-treated lumber is designed for use in outdoor structures and applications, meaning that it is highly resistant to wood rot, fungi and insect damage.
It also has a much higher level of tolerance for moisture than untreated lumber. Nevertheless, because the extended contact with high levels of moisture often experienced when using pressure-treated lumber for concrete forms tends to cause it to swell and warp, it is generally only recommended if the application requires use of a material that is highly resistant to outdoor elements.
If possible, it is best to use untreated lumber or composite forms specifically designed and manufactured for use with concrete.
What is the plywood for formwork?
Plywood is a type of construction material that is made out of thin layers of wood that are cross-laminated and bonded with adhesive. It is often used as a type of formwork, which refers to temporary structures used during construction or repairs.
Formwork serves to provide a mould that is used to shape the concrete or other material that is poured into it. Plywood is frequently used as formwork because of its strength, durability, and ability to hold up to wear and tear that comes with use during construction or repairs.
Additionally, plywood formwork can be easily dismantled upon completion, making it a convenient choice for most projects. Plywood formwork can also be reused for multiple projects, since it is designed to be taken apart and put back together multiple times.
Does cement bond to wood?
Yes, cement does bond to wood. Concrete and wood are two materials that can be easily used together in construction projects, as the two materials can both be bound together with a strong adhesive. Such as epoxy and polyurethane cements.
These cements are designed to increase the bond strength between the two materials, allowing for a long-lasting and durable connection between the two. Applying the cement to the wood surface is usually done by lightly sanding the wood first, then applying a sealant to the wood before applying the cement.
Once applied, the cement should be allowed to cure for at least 24 hours before the area being bonded is used for anything else. If done properly, the cement should provide a strong bond between the wood and the cement, as well as provide extra protection against the elements.
What tool is used for cutting concrete?
Concrete cutting is a process of controlled sawing, drilling and removal of concrete performed by qualified operators using special saws that use diamond impregnated blades. Concrete cutting is often used alongside concrete drilling and core drilling as part of a wider range of services offered by professional contractors.
Generally speaking, the most common tools used when cutting concrete are a hand-held circular saw with a blade that is made for concrete, a walk-behind concrete saw, a masonry saw, an angle grinder, or a flat saw with a diamond blade.
In more complex applications, a specialty diamond saw may be used, depending on the size and shape of the area that needs to be cut.
Can I cut concrete with a grinder?
Yes, it is possible to cut concrete with a grinder. A diamond blade grinder is the best tool for cutting through concrete because the blade is designed with diamond-tipped teeth to help you make a precise, clean cut with minimal effort.
However, it is important to note that the blade should always be kept wet when it is being used to cut concrete since this helps dissipate the heat that is generated by the friction and reduces the risk of the blade becoming unbalanced.
Additionally, it is important to wear protective clothing as well as goggles and a face mask when you are cutting concrete to prevent dust particles from getting into your lungs. Lastly, it is worth taking the time to plan out your route beforehand, as this will help you make a cleaner cut.
Can a slab be circular?
Yes, it is possible to create a circular slab. The most common way to create a circular slab is by using precast concrete components, which are pre-shaped into a circle and can help create a structurally sound circular slab.
It is also possible to pour a circular slab out of concrete or a combination of cement, sand and gravel. Pouring a circular slab is a more labor-intensive process than using pre-made components, however, the results of a correctly poured slab can be much more attractive and precisely designed than pre-made components.
When pouring a circular slab, it is important to add internal reinforcements such as rebar and mesh, which will help increase the slab’s strength and durability, and also to ensure proper drainage around the perimeter of the slab.
How do I create a curved formwork?
Creating curved formwork can be a difficult task but with the right tools and techniques, it can be done relatively easily. First, you will need some curved materials, such as plywood, steel, or aluminum.
Depending on the shape and complexity of the formwork, you may need to use a combination of materials. Once you have chosen your materials, you will need to construct the formwork by cutting, drilling, and fastening the pieces together.
It may be necessary to use several layers of material to create the desired shape.
Next, you will need to create a strong base for the formwork, such as a concrete slab or heavy duty steel supports. This will act as the foundation and ensure that the formwork will be able to withstand the pressure exerted by the concrete or other construction material.
Once your base is constructed, you can begin building the formwork with screws, nails, or other fasteners. You will also need to seal the seams and edges to prevent leakages.
Finally, you can add form release agents which will help protect the formwork from the concrete or other materials and keep it from sticking to the finished surface. With the right tools and materials, it is possible to create a curved formwork quickly and easily.
