The construction of the foundation has to be a fairly exact science. If everything is not calculated correctly, many issues can arise. Experts have devised many construction tricks and techniques that are used to avoid potential pitfalls during the building process. One of these involves the usage of plastic slip sheets. Using a slip sheet as reinforcement has been successfully used for many years in construction.
What is a Plastic Slip Sheet?
A slip sheet is a piece of plastic, typically polyethylene. It can be made in varying thickness, but it is often used in a 10ml form. Like the name suggests, the slip sheet is used to reduce friction and prevent movement or slippage. Using plastic slip sheets as reinforcement in foundation building helps to prevent cracking.
The Post-Tension Process
Slab-on-grade foundations are one of the most commonly used types of foundations in the United States. These foundations are quick and inexpensive to build (which is why they are so popular); however, they can be prone to cracking during the curing stage. Concrete can shrink as it dries; this can cause cosmetic damage to future floor finishes like tile, vinyl, wood, and carpeting. The type of soil - called expansive soil - is what ultimately causes the shrinkage and cracks. Expansive soil shrinks and swells as the water content changes.
To avoid the cracks, a process using plastic slip sheets is generally used. This process is called post-tensioning. Post-tensioning compresses the concrete, which helps it to resist shrinking and cracking that can be caused by the difficult soil conditions. In order to post-tension a slab foundation, steel strands are run through the concrete in a squared grid pattern. Each strand of steel is covered in plastic sheathing that protects the steel from corrosion and allows it to move during the stressing operation. The strands have an anchorage on each end. Each strand, along with its sheathing and anchorage, is called a tendon.
During the post-tensioning process, the tendons are usually stressed along one end; however, sometimes they are stressed along both ends. When they are stressed, the steel stretches -- but it is kept in place by the anchorage. This works to compress the concrete, which, in turn, works to keep the concrete from cracking.
How are Plastic Slip Sheets used with Post-Tensioning?
The plastic slip sheets are installed directly below the slab, or between the slab and the bearing surface. They work to allow the tendons to move the slab smoothly across the ground. Without the slip sheets, the tendons would not have a flat, even surface across which to move. The tendons must be able to move easily across the ground in order to correctly stress the steel, as this is the only way in which the concrete will be compacted in order to avoid shrinkage and cracks.
If builders were to neglect to install plastic slip sheets - or if they were to install them incorrectly - the slab would resist moving, which would prevent the post-tensioning process from being successful.
Plastic Sheeting is the result of plastic extrusion. This is formed by means of a high range manufacturing process - melting and deforming a raw plastic that results to permanent file of plastic sheets.
The ranges of plastic products are compatible for the construction and engineering substances. Display sheets, prints, and signs have diverted into plastic sheeting. Special designs in fabrication of plastic sheets are in extensive service globally. These plastic products have different kinds of classification from window frames to outdoor roofing applications.
Plastic sheeting is the best alternative for the more expensive steel.
There are many types of plastic sheeting. The Acrylic Plastic Sheet combines the most reliable quality for the visor or helmet. It has the most precise optical clearness. The intensity of the color of this product combines a good illumination in a wide range of opaque colors, transparent and translucent.
You can create a design depending on your project because acrylic is easy to shape. It is blended well with tough hardness and finish surface and is resilient to chemical and weather. It is easy to clean and maintain. It is largely utilized for aquariums or tanks at homes or commercial establishments. Acrylic plastic is also best for exterior lenses of automobile lights and appropriate watcher protector.
The Plastic Aluminum Composite Sheet catches the ultimate color of red, blue, green, yellow, metallic, black and white. This generous selection of colors grabs the eye of customers. These are lightweight, making it perfect for loading. It is also rust-proof and weather-proof. The material in aluminum plastic sheet is considered as first class thermal insulation. It has the best proven properties of light polythene core and varnish of baked aluminum polyester. It is ideal for all around indoor and outdoor purposes.
Plastic Aluminum Composite Sheet is recommended to use as panels for canopy and ceiling, display boards and billiards, stand for exhibitions and showrooms, copings for parapet walls, covers for column, wraps for beam, parts for furniture, elevators and stairways, panels for partition, and cladding canopy and balcony
The Polycarbonate Plastic Sheeting is the most natural among all plastic products. It comprises of clear and translucent quality and is heat resistant up to 145 degrees. It is unaffected by acids and water substances. These types of plastic sheeting are best for electronic application such as conduction of electrical properties.
The polycarbonate sheets are stabilized in advanced engineering practice to meet the reinforced shape, a great advantage for those who want to fabricate their own forms of design. Polycarbonate plastic sheeting substance has the best dimensional stability suitable for food exposure. It has the advantage of having superior resistance against heat and temperature and has massive mechanical potency. It also provides high endurance and strength compared to glass.
Polycarbonate plastic sheets are suitable for insulating electrical parts. It can be used also in components for medical and pharmaceutical apparatus, for glazing task, and tough materials for electrical engineers.
Polypropylene Plastic Sheets come in natural, beige, grey, black and white. It possesses superb resistance to solvents and degreasing substance as well as in the attack of electrolytic. The polypropylene Sheets are preferred for all applications exposed to cold state. It is lightweight, easy to form, bendable and welded.
These are used mainly in packaging purposes, cassette holder, pipes, tanks and linings, shells for seats and other automotive parts, containers and fibers.