Russian scientists have created a technology-weather concrete repair

 

Repair runways, highways, railways, bridges and dams equally fast regardless of the weather allows a new technology designed to RCTU Mendeleyev.

Repair of concrete structures in the winter and late fall is very complex. We need to create special conditions: build formwork, concrete shelter Special "blankets" to file current and increase the temperature to about +5 ° C.

New technology does not require such tricks: methyl methacrylate-based composites (C5H8O2)
Low viscosity methyl methacrylate, commensurate with the viscosity of water, so the composition can be prepared for repair in a conventional mixer. Manufacture as other composites, such as epoxy resins, require multistep heat treatment, and their high viscosity increases energy costs in the preparation of molding material.Another plus composite — good adhesion (in other words — adhesion) to concrete, reinforced concrete and metals. This property allows us to solve the "problem of the cold junction" where the old and new layers of concrete crumbled due to poor adhesion at the boundary of contact.

Abroad methyl methacrylate are also used as a binder for composite repair, but monomers bind to oligomers chain of 5-7 molecules, thus increasing the lifetime of methyl methacrylate, but reduces its activity. Take as a raw material monomer, oligomer and not — domestic know-how. 

  The project "Development of a new generation of structural composites based on acrylic binder technology and their application for the construction and repair of roads, railways, bridges and man-made structures" received state aid in the amount of 8,000,000 rubles for the federal target program "Research and Development"

Industrial demand is high in methyl methacrylate — based on this release plexiglass. So the Russian raw material base for the new repair materials is extensive. However, interest in the new structure is small, that is not the best way affects the price. Now the composite is produced in the industrial practice innovation center "Polymer" at the Department of Chemical Engineering plastics RCTU. One kilogram costs about 100 rubles. Calculations show that if we increase the production up to thousands of tons, the cost will drop to ten times, and a further increase in production — compared to the price of conventional concrete. Authors of technology have already filed an application for a three-year grant from the Ministry of Education of the Russian Federation on the development of technology to launch the production of one hundred thousand tons per year.

One application of the technology found in Vnukovo airport, where the runway is number one for many years required constant small repairs. In 2011, the depreciation of its coverage of around 80% and the previous reconstruction was carried out over 35 years ago — this is the information the press service of the airport.

In repair runway participated Mendeleyev University staff and students. They carried out the work process support. Repair went from two to five o’clock in the morning, between the smallest airport congestion. During this time, managed to patch up the three square meters of surface thickness of 5-7 inches.

— Plain concrete for repairs at the airport will not do: he allowed to stand and is gaining strength not less than 28 days. It’s too long. We could carve out a schedule only a small window to the airfield never stopped working normally. During this time, catching a small area to choose the old concrete, delineate it, and place new, — Says Igor Zhanovich, chief engineer of the construction department of the company "Transstroyinvest" — it works with Vnukovo.

Other customers technology until slightly, but strong contacts with them: some firms University is already working 10 or even 20 years. This is mainly construction companies. There are not ordinary customers, such as installers of safes that are interested in the fact that armored cash vault got up at the wall firmly and permanently.

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