CORROSION RESISTANCE OF THE 11SMN37 STEEL IN THE POLYMER CONCRETE COVERING
Abstract
In the alkaline environment of the concrete covering a thin layer of invisible ferric oxide (Fe<sub>2</sub>O<sub>3</sub>) is created at the steel surface, which protects the steel against corrosion. A drop in the concrete pore fluid pH to the value of 11,8 results in destruction of the passive layer, which in turn increases the rate of corrosion.<BR />Ammonium chloride (NH<sub>4</sub>Cl) contained in industrial waste of the artificial nitrogenous fertiliser plant is reacting with all phases of the concrete covering. Changes in the cement grout phase composition and migration of chloride ions inwards concrete deteriorate protective properties of the concrete covering and increase probability of the reinforcing steel corrosion. Protection of the concrete material surface and structure is frequently related to introducing polymer additives to cement. Thanks to that, a significant improvement in the concrete mixture quality and concrete usefulness have been achieved.
Event details
- Event
- TC15 Youth Symposium 2011
- Technical Committee
- TC15
- Place
- Chemnitz, GERMANY
- Time
- 25 May 2011 - 28 May 2011