Projects per year
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.
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.
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.
Original language | English |
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Pages (from-to) | 341-358 |
Number of pages | 18 |
Journal | Clay Minerals |
Volume | 49 |
Issue number | 3 |
DOIs | |
Publication status | Published - 30 Jun 2014 |
Fingerprint Dive into the research topics of 'Monitoring hydration in lime-metakaolin composites using electrochemical impedance spectroscopy and nuclear magnetic resonance spectroscopy'. Together they form a unique fingerprint.
Projects
- 2 Finished
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LIMES.NET: Network for Low Impact Materials and Innovative Engineering Solutions for the Built Environment
Walker, P., Ansell, M., Heath, A. & Ibell, T.
Engineering and Physical Sciences Research Council
1/09/11 → 31/08/12
Project: Research council
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Transferred Grant for Dr Richard Ball - An Electrochemical Approach to Study Carbonation of Novel Lime Based Materials
Engineering and Physical Sciences Research Council
15/10/10 → 31/01/14
Project: Research council
Profiles
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Chris Bowen
- Department of Mechanical Engineering - Professor
- Materials and Structures Centre (MAST)
- Centre for Sustainable and Circular Technologies (CSCT)
- Centre for Nanoscience and Nanotechnology
- EPSRC Centre for Doctoral Training in Statistical Applied Mathematics (SAMBa)
- Institute for Mathematical Innovation (IMI)
- Centre for Biosensors, Bioelectronics and Biodevices (C3Bio)
- Centre for Autonomous Robotics (CENTAUR)
Person: Research & Teaching
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Pete Walker
- Department of Architecture & Civil Engineering - Professor
- BRE Centre in Innovative Construction Materials (BRE CICM)
- Institute for Sustainable Energy and the Environment
- Institute for Policy Research (IPR)
- Building Research Park
- Centre for Doctoral Training in Decarbonisation of the Built Environment (dCarb)
- Centre for Nanoscience and Nanotechnology
Person: Research & Teaching
Equipment
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MC2-Electron Microscopy (EM)
Material and Chemical Characterisation (MC2)Facility/equipment: Technology type
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MC2- Nuclear Magnetic Resonance (NMR)
Material and Chemical Characterisation (MC2)Facility/equipment: Technology type