Rastra is the trade name for certain insulating concrete forms (ICF) used to make walls for buildings. It is one of the earliest products, in production since 1972, and consists of concrete and thastyron. Thastyron is a mixture of plastic and bonding foam consisting of eighty-five percent of post-consumer recyclable polystyrene waste molded into blocks. The main components of the literature are the expanded cement, water and polystyrene.
Video Rastra
Production
Rastra is continuous in its production because there is no energy used in the preservation process, and only one to three kilowatt hour (kWh) is required to make each block. After the blocks are trimmed to the right size, the remnants of the waste are recycled to create new blocks. No byproducts are released in the production process which is considered a burden to the environment.
Maps Rastra
Build
Rastra blocks come in various sizes, and can be easily cut with craft tools to shape the desired shape. These blocks are usually attached together with a clamp or glue to form a grid-like system. Rebar is then run through the grid, which is then filled with concrete.
History
Polystyrene concrete was invented in 1960. BASF, a German chemical conglomerate, originally created this product, but found no successful application. A company based in Austria-Switzerland modifies the product and creates what is known as Rastra.
Fire rating
As a thermal barrier, Rastra has a fire rating of four hours without spreading fire and no smoke development. A five-hour fire resistance test from a ten-inch thick wall with temperatures exceeding two thousand degrees Fahrenheit on the wall surface indicates that the walls do not heat up. This reduces the number of health hazards during fires and also makes building repairs easier after that.
Physical properties
Thastyron has a compressive force of 56 pounds-force per square inch (psi) and a 43 psi tensile strength. Rastra has a low toxicity level. Rastra is very frozen, mushrooms, and mushroom resistant. Sound insulation is greater than 50 decibels (dB).
Isolation
As heat insulation, the literature keeps the room at a constant temperature and changes the temperature changes, both of which can decrease energy use. It also has a low heat penetration depth.
References
External links
Source of the article : Wikipedia
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