| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Walker, Peter
University of Bath
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2018Comparative moisture and heat sorption properties of fibre and shiv derived from hemp and flaxcitations
- 2018The influence of constituents on the properties of the bio-aggregate composite hemp-limecitations
- 2016Variability of the mechanical properties of hemp concretecitations
- 2015Fire performance of metal-free timber connectionscitations
- 2014Screw connectors for thin topping, timber-concrete compositescitations
- 2014Numerical analysis of triplet shear test on brickwork masonrycitations
- 2014Monitoring hydration in lime-metakaolin composites using electrochemical impedance spectroscopy and nuclear magnetic resonance spectroscopycitations
- 2013Contemporary non-metallic timber connections
- 2012Drystone retaining walls: ductile engineering structures with tensile strengthcitations
- 2011Development of all-wood connections with plywood flitch plate and oak pegscitations
- 2010Development of non-metallic timber connections for contemporary applications
- 2009The compressive strength of modern earth masonry
- 2009The compressive strength of modern earth masonry
- 2008Strength characteristics of hydraulic lime mortared brickworkcitations
- 2008Microstructural design of materials for aerostatic bearingscitations
- 2007Effects of carbonation on the pore structure of non-hydraulic lime mortarscitations
Places of action
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article
Monitoring hydration in lime-metakaolin composites using electrochemical impedance spectroscopy and nuclear magnetic resonance spectroscopy
Abstract
This paper describes a study of the hydraulic reactions between metakaolin (MK) and air lime using electrochemical impedance spectroscopy (EIS) and nuclear magnetic resonance spectroscopy (NMR). Tests were carried out at 20, 25 and 30°C on lime-MK pastes with 10:1 w/w ratio. Tests over 28 days allowed identification of relevant changes in the EIS signals and characterization of pastes using thermal analysis (TGA/DSC), scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and uni-axial compressive tests. Tests over shorter periods of time (up to 42 h) allowed more detailed studies of the hydraulic phases formed at the very beginning of the reactions.<br/><br/> Results of thermal analyses demonstrate formation of hydraulic compounds such as CSH, C4AH13 and C3ASH6 and show their evolution over time. MIP analysis demonstrates changes in pore size distribution related to the formation and trasformation of hydraulic phases. Variations of impedance response with time are shown to be associated with reaction kinetics. Changes in the NMR signal within the first 42 h of reaction are shown to be associated with the dissolution of calcium hydroxide in the pore solution. Overall, this paper demonstrates the importance of NMR in the study of hydraulic reactions in lime based materials and the ability of EIS to detect the formation of hydraulic compounds and the end of the calcium hydroxide dissolution process.