Microstructural and permeability changes due to accelerated Ca leaching in ammonium nitrate solution
- Author
- Quoc Tri Phung (UGent) , Norbert Maes, Diederik Jacques, Geert De Schutter (UGent) and Guang Ye (UGent)
- Organization
- Abstract
- Although Ca leaching in cement-based materials is an extremely slow process, this process is relevant for long-term assessments of the evolution of concrete used in radioactive waste disposal systems. In the present work, an ammonium nitrate solution of 6 mol/l was used to accelerate the leaching kinetics of cement paste. The change of sample mass over time was monitored by weighing, whereas the amount of calci-um ion leached out during the test was followed by ion chromatography. A variety of post-analysis tech-niques like XRD, MIP and BET were used to characterize the microstructural changes and portlandite content, while the degraded front was determined by phenolphthalein spraying. The effect of accelerated leaching on transport properties was studied by measuring changes in water permeability. Results showed that (i) the porosity of the leached samples increased significantly, (ii) the critical pore size was shifted to larger radius and (iii) the BET specific surface area of the leached sample was also significantly increased. These changes resulted in a one to two order increase in water permeability depending on the immersed time.
- Keywords
- CHEMICAL DEGRADATION, PORE STRUCTURE, WATER PERMEABILITY, CEMENT-BASED MATERIALS, ORGANIC-ACIDS, PASTES, BEHAVIOR, TESTS
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-5700369
- MLA
- Phung, Quoc Tri, et al. “Microstructural and Permeability Changes Due to Accelerated Ca Leaching in Ammonium Nitrate Solution.” CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR, edited by Michael Grantham et al., CRC Press, 2014, pp. 431–38.
- APA
- Phung, Q. T., Maes, N., Jacques, D., De Schutter, G., & Ye, G. (2014). Microstructural and permeability changes due to accelerated Ca leaching in ammonium nitrate solution. In M. Grantham, P. M. Basheer, B. Magee, & M. Soutsos (Eds.), CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR (pp. 431–438). Leiden, The Netherlands: CRC Press.
- Chicago author-date
- Phung, Quoc Tri, Norbert Maes, Diederik Jacques, Geert De Schutter, and Guang Ye. 2014. “Microstructural and Permeability Changes Due to Accelerated Ca Leaching in Ammonium Nitrate Solution.” In CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR, edited by Michael Grantham, PA Muhammed Basheer, Bryan Magee, and Marios Soutsos, 431–38. Leiden, The Netherlands: CRC Press.
- Chicago author-date (all authors)
- Phung, Quoc Tri, Norbert Maes, Diederik Jacques, Geert De Schutter, and Guang Ye. 2014. “Microstructural and Permeability Changes Due to Accelerated Ca Leaching in Ammonium Nitrate Solution.” In CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR, ed by. Michael Grantham, PA Muhammed Basheer, Bryan Magee, and Marios Soutsos, 431–438. Leiden, The Netherlands: CRC Press.
- Vancouver
- 1.Phung QT, Maes N, Jacques D, De Schutter G, Ye G. Microstructural and permeability changes due to accelerated Ca leaching in ammonium nitrate solution. In: Grantham M, Basheer PM, Magee B, Soutsos M, editors. CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR. Leiden, The Netherlands: CRC Press; 2014. p. 431–8.
- IEEE
- [1]Q. T. Phung, N. Maes, D. Jacques, G. De Schutter, and G. Ye, “Microstructural and permeability changes due to accelerated Ca leaching in ammonium nitrate solution,” in CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR, Belfast, UK, 2014, pp. 431–438.
@inproceedings{5700369,
abstract = {{Although Ca leaching in cement-based materials is an extremely slow process, this process is relevant for long-term assessments of the evolution of concrete used in radioactive waste disposal systems. In the present work, an ammonium nitrate solution of 6 mol/l was used to accelerate the leaching kinetics of cement paste. The change of sample mass over time was monitored by weighing, whereas the amount of calci-um ion leached out during the test was followed by ion chromatography. A variety of post-analysis tech-niques like XRD, MIP and BET were used to characterize the microstructural changes and portlandite content, while the degraded front was determined by phenolphthalein spraying. The effect of accelerated leaching on transport properties was studied by measuring changes in water permeability. Results showed that (i) the porosity of the leached samples increased significantly, (ii) the critical pore size was shifted to larger radius and (iii) the BET specific surface area of the leached sample was also significantly increased. These changes resulted in a one to two order increase in water permeability depending on the immersed time.}},
author = {{Phung, Quoc Tri and Maes, Norbert and Jacques, Diederik and De Schutter, Geert and Ye, Guang}},
booktitle = {{CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR}},
editor = {{Grantham, Michael and Basheer, PA Muhammed and Magee, Bryan and Soutsos, Marios}},
isbn = {{9781138027084}},
keywords = {{CHEMICAL DEGRADATION,PORE STRUCTURE,WATER PERMEABILITY,CEMENT-BASED MATERIALS,ORGANIC-ACIDS,PASTES,BEHAVIOR,TESTS}},
language = {{eng}},
location = {{Belfast, UK}},
pages = {{431--438}},
publisher = {{CRC Press}},
title = {{Microstructural and permeability changes due to accelerated Ca leaching in ammonium nitrate solution}},
year = {{2014}},
}