Abstract
Loss of bentonite from geosynthetic clay liners (GCLs), installed as a component of a composite liner beneath an exposed geomembrane (GM) on the side-slopes of landfills and exposed to thermal cycling, has become a topic of some importance recently as it raises questions on the long-term durability of modern landfill lining products. Laboratory drip testing was used to evaluate the resilience of four GCLs containing polymer-modified powdered bentonite against down-slope bentonite erosion. Onset erosion features were observed only after 60–140 drip cycles. In all probability the polymer-modified bentonite can be expected to self-heal if no further erosion takes place at these initial stages. A detailed assessment of the drip test and comparison with known field test results, indicates that the drip rate and duration of the laboratory test conducted at ≈22 °C is equivalent to in-field conditions where daytime temperatures of the GM/GCL may reach 65 to 75 °C. Thus, meaningful accelerated testing of polymer-modified powdered bentonite GCL products is possible. The results need to be validated with in-field tests under local conditions because recoverable service-lives of GCL products ultimately depend on the in-field conditions where these materials are deployed.
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References
Ashe L, Rowe RK, Brachman RWI, Take WA (2014) Laboratory study of downslope erosion for ten different GCLs. J Geotech Geoenvironmental Eng. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001191. 04014079
Bouazza A, Ali M, Gates WP, Rowe RK (2017) New insight on geosynthetic clay liner hydration: the key role of subsoils mineralogy. Geosynth Int 24:139–150
Brachman RWI, Rentz A, Rowe RK, Take WA (2015) Classification and quantification of downslope erosion from a GCL when covered only by a black geomembrane. Can Geotech J 52:395–412
Chappel MJ, Brachman RWI, Take WA, Rowe RK (2012) Large-scale quantification of wrinkles in a smooth, black, HDPE geomembrane. ASCE J Geotech Geoenvironmental Eng 137:671–679
Malik MAS, Tiwari G, Kumar A, Sodha MS (1982) Solar distillation: a practical study of a wide range of stills and their optimum design, construction, and performance. Pergamon Press, New York
Moreno L, Liu L, Neretnieks I (2011) Erosion of sodium bentonite by flow and colloid diffusion. Phys Chem Earth Parts A/B/C 36:1600–1606
Rowe RK, Ashe LE, Take WA, Brachman RWI (2014) Factors affecting the down-slope erosion of bentonite in a GCL. Geotext Geomembr 42:445–456
Rowe RK, Brachman RWI, Take AW, Rentz A, Ashe LE (2016) Field and laboratory observations of down-slope bentonite migration in exposed composite liners. Geotext Geomembr 44:686–706
Rowe RK, Chappel MJ, Brachman RWI, Take WA (2012) Field monitoring of geomembrane wrinkles at a composite liner test site. Can Geotech J 49:1196–1211
Take WA, Brachman RWI, Rowe RK (2015) Observations of bentonite erosion from solar-driven moisture migration in GGLs covered only by a black geomembrane. Geosynth Int 22:78–92
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Gates, W.P., Gibbs, D., Amstberg, M. (2019). Resilience of Australian Polymer-Modified Powdered Sodium Bentonite Geosynthetic Clay Liners to Downslope Bentonite Erosion. In: Zhan, L., Chen, Y., Bouazza, A. (eds) Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2. ICEG 2018. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-2224-2_78
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DOI: https://doi.org/10.1007/978-981-13-2224-2_78
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