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Corrosion Resistance – Protectocıl CIT

Corrosion Resistance – Protectocıl CIT

Buildings, bridges, multistorey car parkings are most significant private or public investmens. However, reinforcement bars inside concrete of these structures get older and rusted. This situation causes strength loss on them. If maintenance cost are expensive too, it will be a very difficult case to be handled. The key to protect for a long time of these structures is to keep surface away from water and chloride ions. Even if corrosion is observed on surfaces, applicable and suitable solutions can be still found.

Protectosil® CIT products is a silane based corrosion protection system and it is one of the most excellent product of EVONIK. Like other Protectosil® products, also Protectosil® CIT product creats a durable and long-lasting barier due to its deep hydrophobasion property. It penetrates applied surface and reacts with concrete. It protects reinforcements in concrete and stops developing of corrosing.

The most effective maintenance method is to not requiering any maintenance. That’s exactly why, we recommend Protectosil® CIT to you not only for older concrete structure but also for new constructed structures.

Water effect is main problem to harm structures. While struggle with weathering, this situation causes freeze-thaw and salt attacks. Yet, water is only one of the reasons for deterioration. The main reason for rusting of reinforcement bars in concrete and occuring mechanical regression is chlorine. Water molecules react with concrete due to electrostatically, because of this reaction, chlorine transmission increases and bars start to rust. Protectosil® CIT product shows resistance effect against either chlorine or water reaction. First of all, Protectosil® CIT product creats a deep barier to blocking water and it prevents reaching chlorine ions to reinforcements. After that, Protectosil® CIT product blocks electrolit current and so, decreasing is observed on rusting. According to an independent research, three products in markets to used for corrosion protection can not be really effective against chlorine transmission* and can not prevent rusting.

On the other hand, Protectosil® CIT decreases effectively rusting rate due to ASTM-G109**

* J.E. Bennett, Consultants Inc. / a research on rusting protectors due to ASTM G-109 prosedures. / Raport February 2004
** J.E. Bennett, Consultants Inc. / a research on Protectosil® CIT due to ASTM G-109 prosedures / Rapor November 29 2005

PROTECTOSIL CIT were applied as a testing on WJE Associates(1) concrete reinforcement bars which have cracks approximately 0.3 mm wide. Some of specimens were protected with Protectosil® CIT before wet and drying. Wet and drying procedures perform with 15% of NaCl solution. Other specimens were left unprotected. After 12 weeks, end of the test, corrosion and rust could be observed on unprotected specimens. By comparison, active corrosion or rusting were not encountered on specimens protected with Protectosil® CIT. Determination any corrosion occured on reinforcement bars before serious and irrecoverable damage arises on concrete is very important. Most efficient way to determine corrosion in the beginning is measuring chlorine contamination or electrical potensial/voltage difference. There are some useful in stu measurements devices, for example, linear polarization equipments.

Graphic given below shows correlation between corrosion rate and periods of visible rusting. After corrosion on reinforcement bars, application of Protectosil® CIT products is effective solution.

Model application : “Monroe Country Multi-storey Car Parking”

Conditions are very tough in multi-storey car parking. In 1996, corrosion rate was determined and measured due to test in Monroe County Multi-storey Car Parking which is 30 years old building located in Pennsylvania, USA. Corrosion rate showed that high corrosion occuring on reinforment bars. If results are below 0.2 µA/cm2, there is not any active corrosion risks. However, in case result are above the limit, concrete structure can be damaged. Corrosion rate on Monroe Country Multi-storey Car Parking was 0.68 µA/cm2 before application of Protectosil® CIT and that situation had posed danger. That happens mostly in winter because of salts,ice-breaker- came on tires of cars. After application of Protectosil® CIT, the rate mentioned above decreased under level of  0.1 µA/cm2. Although 11 year have passed, Protectosil® CIT application has not required to doing again. Also, protection has beenstill  keeping its performance.

Model Application : “Application on Columns of Galleria Cianca Presella”

Sensors mesured recent and potential corrosion. For more detailed analysis of mesured values, rusted steel amount was calculated. It helped to estimate developments on corrosion damages. Point time after Protectosil® CIT applied, protected surface showed less corrosion development. Then, protected column had reached specific passive corrosion level and stoped (tag p). Corrosion situation observed on unprotected surface. (tag a)

Product;

Protectosil® CIT; decreases significantly chloroid based corrosion of reinforcing steel bars in concrete due to reaction of active material of cement phase with steel surface.

Protectosil® DRY CIT; is a pulverulent protection pruduct. Protectosil® DRY CIT holds in honour with many awards and it is the first solid protection additive from reinforced concrete corrosion.

Protectosil® WA CIT protectes especially for reinforced concrete, cast concrete, prefabricated concrete members from chloride based corroion. Product dissolves homogeneously inside concrete and protection shrinkage decreases.