Pore solution alkalinity of cement paste as determined by Cold Water Extraction
Cold Water Extraction (CWE) is a technique used to extract the pore solution of cementitious materials and to study its alkalinity. CWE can be used on paste, mortar or concrete, and requires only standard laboratory equipment. The method is not yet standardised, so several parameters must be arbitra...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Cement |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666549223000014 |
| _version_ | 1828010920117272576 |
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| author | Maxime Ranger Marianne Tange Hasholt Ricardo Antonio Barbosa |
| author_facet | Maxime Ranger Marianne Tange Hasholt Ricardo Antonio Barbosa |
| author_sort | Maxime Ranger |
| collection | DOAJ |
| description | Cold Water Extraction (CWE) is a technique used to extract the pore solution of cementitious materials and to study its alkalinity. CWE can be used on paste, mortar or concrete, and requires only standard laboratory equipment. The method is not yet standardised, so several parameters must be arbitrarily selected when conducting the test.This work investigated the influence of four parameters on the calculated alkali metal concentrations in the pore solution: the method for determining the amount of pore solution (oven-drying at 40 and 105 °C, desiccator with silica gel and solvent exchange), the size fraction of the powdered material, the leaching duration and the liquid-to-solid ratio. A comparison with values obtained by Pore Water Extraction (PWE) on two cement types emphasises and quantifies the crucial impact of the amount of pore solution on CWE results. The results suggest that some bound alkali metals may be released during CWE. A mechanism is proposed, and recommendations are made to limit any effect of this on CWE results. |
| first_indexed | 2024-04-10T09:07:28Z |
| format | Article |
| id | doaj.art-30c6f21d9e2e41f9a2c444edd8427b21 |
| institution | Directory Open Access Journal |
| issn | 2666-5492 |
| language | English |
| last_indexed | 2024-04-10T09:07:28Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Cement |
| spelling | doaj.art-30c6f21d9e2e41f9a2c444edd8427b212023-02-21T05:15:01ZengElsevierCement2666-54922023-03-0111100055Pore solution alkalinity of cement paste as determined by Cold Water ExtractionMaxime Ranger0Marianne Tange Hasholt1Ricardo Antonio Barbosa2Department of Environmental and Resource Engineering, Technical University of Denmark (DTU), 2800 Kgs. Lyngby, Denmark; Danish Road Directorate, 1577 Copenhagen V, Denmark; Corresponding author.Danish Road Directorate, 1577 Copenhagen V, DenmarkDanish Technological Institute, 2630 Taastrup, DenmarkCold Water Extraction (CWE) is a technique used to extract the pore solution of cementitious materials and to study its alkalinity. CWE can be used on paste, mortar or concrete, and requires only standard laboratory equipment. The method is not yet standardised, so several parameters must be arbitrarily selected when conducting the test.This work investigated the influence of four parameters on the calculated alkali metal concentrations in the pore solution: the method for determining the amount of pore solution (oven-drying at 40 and 105 °C, desiccator with silica gel and solvent exchange), the size fraction of the powdered material, the leaching duration and the liquid-to-solid ratio. A comparison with values obtained by Pore Water Extraction (PWE) on two cement types emphasises and quantifies the crucial impact of the amount of pore solution on CWE results. The results suggest that some bound alkali metals may be released during CWE. A mechanism is proposed, and recommendations are made to limit any effect of this on CWE results.http://www.sciencedirect.com/science/article/pii/S2666549223000014AlkalisPore solutionCement pasteBlended cementDrying |
| spellingShingle | Maxime Ranger Marianne Tange Hasholt Ricardo Antonio Barbosa Pore solution alkalinity of cement paste as determined by Cold Water Extraction Cement Alkalis Pore solution Cement paste Blended cement Drying |
| title | Pore solution alkalinity of cement paste as determined by Cold Water Extraction |
| title_full | Pore solution alkalinity of cement paste as determined by Cold Water Extraction |
| title_fullStr | Pore solution alkalinity of cement paste as determined by Cold Water Extraction |
| title_full_unstemmed | Pore solution alkalinity of cement paste as determined by Cold Water Extraction |
| title_short | Pore solution alkalinity of cement paste as determined by Cold Water Extraction |
| title_sort | pore solution alkalinity of cement paste as determined by cold water extraction |
| topic | Alkalis Pore solution Cement paste Blended cement Drying |
| url | http://www.sciencedirect.com/science/article/pii/S2666549223000014 |
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