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Quality references for concrete
Luckily for renovation works done with MCI’s various quality measurements exist.
For the level of corrosion protection other factors are reviewed.
4.3 Practical example: Renovation of reinforced concrete in a shipping wharf:
Figure 8: Wharf in Ploce, Croatia where the renovation works took place. (22)
First, as described in the above paragraphs, water-jetting the concrete surface removes the deteriorated concrete and lays bare the corroded steel rods. Simultaneously as the corroded rods are laid bare they also get cleaned as the rust is blasted off by the waterjet. Because it was a wharf that was being renovated, accessibility to the affected area was challenging due to the fact it being so close to the water's’ edge.
Corrosion protection of the reinforcing steel was achieved through a polymer cement coating, containing MCI’s. Simple application by brush of 1-2 coatings meant a consumption of about 0,2 kg/m2 of MCI solution for the 12 mm. diameter reinforcing steel.
Figure 9: Hydrophobic impregnation of the concrete surface (22)
After the removal, cleanup and coating of the reinforced steel reprofiling has to be done to encast the steel back in a concrete matrix. (21) Figure 10: Reprofiled concrete surface (22)
This was performed using 3 layers of repair mortar containing MCI’s. Finally protection from moisture and environmental reactants was achieved by applying both a hydrophobic impregnation solution and a protective/decorative coating, simply acrylic paint containing MCI’s, to the surface of the concrete. (21)
Figure 11: Finished product. (22)
Final quality testing performed by IGH-PC Split showed that the renovation works performed had a positive effect on the reinforced concrete and it was behaving according to the standardized norms and requirements discussed in the paragraphs above. (21)
Conclusion
A huge amount of structures contain steel parts which makes deterioration topic very relevant. In our report we tried to cover all aspects related to damages in structures caused by corrosion. It was found that there are many triggers of corrosion and it is very hard to avoid this process so it should be well controlled. Many factors should be taken into consideration because a small defect or shortcoming in design could lead to significant economical impact. Risk analysis on design stage, correct design and appropriate protection will help to reach the maximum lifetime of construction, and maintenance made in time will help to prolong constructions life.
References
1 Megan Jett Infographic: Steel & Architecture [figure] 17 January 2012 http://www.archdaily.com Accessed 1 December 2015 2 The free encyclopedia for UK steel construction information Residential and mixed-use buildings [online] http://www.steelconstruction.info/ Accessed 1 December 2015 3 Classification by commercial name and structure of ferrous alloys [figure] October 2011 http://www.totalmateria.com/ Accessed 1 December 2015 4 Classification of Carbon and Low-Alloy Steels 1 November 2001 [online] http://www.totalmateria.com/ Accessed 1 December 2015 5 Vaschenko A. P. Issues of strength. Moscow 1978 p.235 6 Berlin A.A. Basics of polymer adhesion. Moscow 1974 p.226 7 Problems and Solutions during Steel Construction 18 April 2014 [online] http://www.havitsteelstructure.com/ Accessed 1 December 2015 8 Wiley-Blackwell Steel designer´s manual (7th edition) Information required to ensure weld quality and performance. Welds and design for welding. [figure] February 2012 9 Intermediate Structural engineering guide book [online] http://engineeringtraining.tpub.com/ Accessed 1 December 2015 10 The free encyclopedia for UK steel construction information Some best practices to keep in mind when designing steel structures [figure] http://www.steelconstruction.info/ Accessed 1 December 2015 11 Managing risk at the design stage. Safe erection of structural steel for buildings Edition No. 1 Victoria: WorkSafe Victoria; 1 May 2009 12 Factors that affect the rate of corrosion [online] http://www.capital-painting.com/factors-that-affect-the-rate-of-corrosion/ 13 "Durability of Galvanized Steel Framing in Residential Buildings", International Zinc Association [figure] http://www.steelframing.org/PDF/durability/durability2011-singlepgs-final.pdf 14 How to build a house yourself - concrete protection [online] http://podomostroim.ru/zashhita-betona/ 15 Reinforced concrete protection [online] http://dockerspb.ru/udalenie-rzhavchiny/zashhita-armatury-ot-korrozii 16 Steel and copper pipelines corrosion [online] http://www.abok.ru/for_spec/articles.php?nid=2773 17 Dr. Akil Ahmed, Prof. Mehtab Alam, and Dr. Asif Husain. Investigation of Structural Defects and Renovation of a RC Residential Building. International Journal of Chemical, Environmental & Biological Sciences (IJCEBS) Volume 1, Issue 2 (2013) ISSN 2320 –4087 18 Repairing, renovating and strengthening concrete [online] http://www.kleinandhoffman.com/images/uploads/RepairRenovationStrengtheningConcrete%20Structures%20Paul.pdf 19 Repair of corrosion affected areas in reinforced concrete [online] http://civil-resources.blogspot.fi/2010/06/repair-of-corrosion-affected-reinforced.html 20 "Durability of Galvanized Steel Framing in Residential Buildings", International Zinc Association [online] http://www.steelframing.org/PDF/durability/durability2011-singlepgs-final.pdf 21 Jure Franciskovic, Boris Miksic, Ivan Rogan, Mijo Tomicic, Protection and repair of reinforced concrete structures by means of MCI-inhibitors and corrosion protective materials. May 21, 2006 22 Jure Franciskovic, Boris Miksic, Ivan Rogan, Mijo Tomicic, Protection and repair of reinforced concrete structures by means of MCI-inhibitors and corrosion protective materials. May 21, 2006 [figure] 23 Epoxy coated rebar [figure] http://solutions.3m.com/wps/portal/3M/en_US/CPPD/Home/ 24 Application of Corrosion inhibitors [figure] http://www.epms-supplies.co.uk/c-Corrosion-Inhibitors-(26).aspx
Date: 2015-12-18; view: 1080
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