Corrosion protection performance of microsilica added concretes in NaCl and seawater environments |
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| Affiliation: | 1. Research and Development Center, P.O. 8034, SWCC, Al-Jubail 31951, Saudi Arabia;2. SABIC Technology Center, P.O. Box 8160, Al-Jubail 31951, Saudi Arabia;3. Saudi Al-Amar for Trading and Industry, P.O. Box 17, Dammam 31411, Saudi Arabia;1. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Tech Lane Ghent Science Park, Campus A, Technologiepark Zwijnaarde 60, 9052 Ghent, Belgium;2. Polymer Chemistry and Biomaterials Group, Centre of Macromolecular Chemistry, Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, Building S4-bis, 9000 Ghent, Belgium;1. Department of Civil Engineering, Isfahan University of Technology (IUT), Isfahan, Iran;2. Civil Engineering Department, Islamic Azad University-Khomeinishahr Branch, Isfahan, Iran;3. Civil and Environmental Engineering Department, Oklahoma State University, Stillwater, OK, USA;4. Department of Civil Engineering, University of Isfahan, Isfahan 81744-73441, Iran;5. Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;1. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China;2. School of Civil Engineering, Southeast University Nanjing, 210096, China;1. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China;2. School of Civil Engineering, Tongji University, Shanghai 201804, China;3. Zhejiang Transportation Investment Group Co. LTD, Hangzhou, Zhejiang 310020, China;4. School of Architectural Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China;1. IMT Lille Douai, Univ. Lille, Laboratoire de Génie Civil et géo-Environnement, LGCgE-EA 4515, Département Génie Civil & Environnemental, F-59000 Lille, France;2. Université de Lille, Laboratoire de Génie Civil et géo-Environnement, LGCgE-EA 4515, Villeneuve d’Ascq F-59650, France;3. Arts et Métiers ParisTech, MSMP, Lille 59800, France;1. Department of Civil Engineering, Saveetha School of Engineering Chennai, Tamilnadu, India;2. Department of Civil Engineering, Aarupadai Veedu Institute of Technology, Vinayaka Mission’s Research Foundation, Chennai, Tamilnadu, India;3. Department of Mechanical Engineering, Saveetha School of Engineering, Tamilnadu, India |
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| Abstract: | In a hardened concrete structure, diffusion of oxygen, carbon dioxide, aggressive ions and moisture from the concrete/environment to the concrete/rebar interfaces takes place through the pores. This results in the failure of the passivation provided by the alkalinity of the cement to the rebars. Microsilica is a mineral that improves the corrosion protection and strength of concrete by reducing the permeability of the concrete and forming more calcium silicate hydrate (CSH) which provides strength and durability to concrete. In order to study the corrosion protection behavior of microsilica in ordinary Portland cement (OPC) and sulfate resistant cement (SRC), carbon steel reinforced concrete specimens of above cements containing 10% each of densified (DMS) and undensified (UDMS) microsilica were exposed to 5% NaCl solution and seawater. Corrosion of rebars was monitored using open circuit potential (OCP) measurements. Diffusion of ions into the concrete was studied by salt ingress, salt fog and rapid chloride permeability tests. It has been noted that densified microsilica provides better corrosion protection to the rebars than the undensified one. In addition to this its protective effect with SRC is much more than with OPC. An attempt has been made to explain the mechanism of corrosion protection behavior of microsilica added concrete immersed in seawater and NaCl solution. |
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