Journal
MATERIALS
Volume 6, Issue 6, Pages 2508-2521Publisher
MDPI
DOI: 10.3390/ma6062508
Keywords
low-pH cements; hydration; microstructure; pH sensors; corrosion of steel reinforcements
Categories
Funding
- EU Project ESDRED [FI6W-CT-2004-508851]
- ENRESA
- Spanish Ministry of Economy and Competiveness [BIA 2011_22760]
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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.
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