Rust Prevention Method and Process of Steel Formwork Surface

With the continuous increase of the state's investment in highways and other infrastructure in recent years, the construction of new large-span bridges has continued to emerge, and the concrete structure system is large and the style is complicated, so the requirements on the formwork are more stringent. For special structures, the use of shaped steel formwork has the characteristics of high formwork strength, moderate cost, reusability, and good appearance quality after concrete pouring. It has gradually become the standard requirement for construction companies to prefer custom steel formwork. The prevention of rusting of steel is a common technical problem in the current engineering field.

Ⅰ. How to prevent rust on the surface of steel formwork?

According to the current market survey and analysis, steel formwork is still an important building material for engineering construction, and the annual use of steel formwork is also increasing year by year. However, the rust and damage of steel formwork is also showing a rapid growth momentum.

TECON provides a simple and effective anti-rust treatment method for steel formwork. It is hoped to achieve slowing down the rust rate of steel and prolonging the use time of steel formwork.

1. After the custom steel formwork is polished before construction, apply a layer of cement mortar on the surface of the steel formwork with a thickness of 2-3cm; the proportion of cement mortar by weight is: cement 250, water 270, sand 1424;

2. After 7-8 days of oxidation, a dense oxide film is formed on the surface of the formwork, which prevents air from directly contacting the surface of the formwork;

3. Knock off the mortar on the surface of the steel shuttering. After being polished again, the surface is painted with formwork oil, then covered with a plastic film, and stacked together. The proportion of formwork oil in parts by weight is: Diesel 60, waste engine oil 25, vegetable oil 13, liquid paraffin 1.5. The vegetable oil can be peanut oil, soybean oil, or other vegetable oils.

Ⅱ. The principle of rust prevention of steel formwork

After the surface of the steel formwork is treated with cement mortar, the formwork surface and the cement mortar chemically react to form a new substance attached to the formwork surface, and then brush the formwork oil for storage, which can achieve long-term storage of the formwork surface without being corroded.

The above methods avoid surface corrosion of the steel formwork due to long-term non-use, and save the cost of the formwork. When cleaning the formwork, workers only need to clean the surface of dust, mud and other adhesives, which saves rust removal time and improves construction efficiency. Cement mortar is simple to make, flexible to mix, and a small amount can be mixed manually with the cement mortar on the surface of the formwork. The anti-rust effect is obvious with a very high use value.