Concrete
- 2. Dr. Reza Javaherdashti - holds a double degree in Materials Science and Metallurgical Engineering. - He has over his 25+ years experience in both academia and industry, - Dr. Reza has been involved in 400+ projects in various industries globally. - He has prepared many Root Cause analysis reports as well as having written eight books published by Elsevier, CRC Press, Springer and Wiley. 15 July 2021, Hengelo, The Netherlands 2
- 3. 15 July 2021, Hengelo, The Netherlands 3
- 4. Some books authored/co-authored by Dr. Reza Javaherdashti 15 July 2021, Hengelo, The Netherlands 4
- 5. Some books authored/co-authored by Dr. Reza Javaherdashti 15 July 2021, Hengelo, The Netherlands 5
- 6. Concrete
- 7. -Corrosion is to address degradation of metals, Deterioration is to address degradation of non-metals In Reinforced concrete (RC), both “corrosion” and “deterioration” are observed. In RC, both corrosion and deterioration can have microbial cause. In this case, corrosion will be MIC and deterioration will be MID. MIC= Microbiologically influenced corrosion MID= Microbiologically influenced Deterioration QUICK FACTS
- 17. Mechanisms
- 19. “Corrosion” in RC: Tuutti Model Chemical Deterioration Mechanism
- 23. Microbiological Deterioration : Bacterial Mechanism Carbonation
- 24. Microbiological Deterioration Bacterial Mechanism Sulphuric Acid produced by SOB When sulphate conc. Is less than 1000 ppm and pH higher than 3 When sulphate conc. more than 1000 ppm and pH less than 3 Mechanical Integrity of Concrete is lost Gypsum is formed Ettringite is formed Reaction with Acid
- 25. Microbiological Deterioration : Algae Mechanism
- 26. Microbiological Deterioration : Algae Mechanism
- 27. Counter-Measures: The start of MID is by chemical factors that would allow pH drop. So, any ways that can help you keep the pH of concrete in basic region is ok to apply to avoid MID,
- 28. Counter-Measures: Quality of the mix: Low water/cement ratio Quality of the mix: Good quality water Low (zero) porosity Avoid “Danger” threshold values!
- 30. Conclusion
- 31. For Further comments and information Please Contact us: Dr. Reza Javaherdashti javaherdashti@Enincoating.com Website: www.enincoating.com