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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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Author
García Calvo, José Luis
Sánchez Moreno, Mercedes
Alonso Alonso, María Cruz
Hidalgo López, Ana
García-Olmo, J.
Publisher
MDPI
Date
2013
Subject
Low-pH cements
Hydration
Microstructure
pH sensors
Corrosion of steel reinforcements
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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
URI
http://hdl.handle.net/10396/15280
Fuente
Materials 6(6), 2508-2521 (2013)
Versión del Editor
http://dx.doi.org/10.3390/ma6062508
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