Materials 2013, 6(6), 2508-2521; doi:10.3390/ma6062508
Article

Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement

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Received: 9 April 2013; in revised form: 29 May 2013 / Accepted: 29 May 2013 / Published: 18 June 2013
(This article belongs to the Special Issue Corrosion Monitoring and Control)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Low-pH cements are designed to be used in underground repositories for high level waste. When they are based on Ordinary Portland Cements (OPC), high mineral admixture contents must be used which significantly modify their microstructure properties and performance. This paper evaluates the microstructure evolution of low-pH cement pastes based on OPC plus silica fume and/or fly ashes, using Mid-Infrared and Near-Infrared spectroscopy to detect cement pastes mainly composed of high polymerized C-A-S-H gels with low C/S ratios. In addition, the lower pore solution pH of these special cementitious materials have been monitored with embedded metallic sensors. Besides, as the use of reinforced concrete can be required in underground repositories, the influence of low-pH cementitious materials on steel reinforcement corrosion was analysed. Due to their lower pore solution pH and their different pore solution chemical composition a clear influence on steel reinforcement corrosion was detected.
Keywords: low-pH cements; hydration; microstructure; pH sensors; corrosion of steel reinforcements
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MDPI and ACS Style

García Calvo, J.L.; Sánchez Moreno, M.; Alonso Alonso, M.C.; Hidalgo López, A.; García Olmo, J. Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement. Materials 2013, 6, 2508-2521.

AMA Style

García Calvo JL, Sánchez Moreno M, Alonso Alonso MC, Hidalgo López A, García Olmo J. Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement. Materials. 2013; 6(6):2508-2521.

Chicago/Turabian Style

García Calvo, José L.; Sánchez Moreno, Mercedes; Alonso Alonso, María C.; Hidalgo López, Ana; García Olmo, Juan. 2013. "Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement." Materials 6, no. 6: 2508-2521.

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