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Effect of high alkalinity levels on geotextiles. Part 2: NaOH solution
Journal article   Peer reviewed

Effect of high alkalinity levels on geotextiles. Part 2: NaOH solution

Y. Halse, R.M. Koerner and A.E. Lord
Geotextiles and geomembranes, v 6(4), pp 295-305
1987
DOI: https://doi.org/10.1016/0266-1144(87)90010-0

Abstract

Alkaline water has been known to affect polymeric materials, such as geotextiles, and this on-going study is aimed at providing a data base to see the extent, nature and incidence of the effects. An earlier study used calcium hydroxide to provide the alkalinity, whereas this study uses sodium hydroxide. Solutions of pH 10 and pH 12 (with pH 7 as control) were prepared and various geotextiles were incubated up to 120 days. Flow tests and strength tests were conducted on all test specimens on a weekly basis for the entire duration. Results of the two phases (i.e. calcium and sodium) essentially parallel one another in that the alkalinity increases the flow time for a given volume of solution to pass through the geotextile. The effect is more pronounced for pH 12 than for pH 10. A precipitate is formed which rests either upon or within the fabric structure causing the major portion of the increased flow time. In addition to this blinding and/or clogging phenomenon is a strength reduction in some of the fabrics. Certain polyester fabrics show measurable strength losses, while others do not. The type of polyester (there are over 200 types) is felt to play a major (but unknown) role in this selection process. Considerable research into both surface and internal morphologies seems to be warranted. Future efforts will be targeted in these directions.

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10 citations in Web of Science
17 citations in Scopus

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Web of Science research areas
Engineering, Geological
Geosciences, Multidisciplinary
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