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Permeability of microcracked fibre-reinforced containment barriers
Cement-based containment barriers for waste landfills are at risk of cracking, thereby reducing effectiveness. Improved resistance to formation of permeable cracks will enhance the performance of cementitious hydraulic barriers exposed to excessive drying or to wet-dry cycles. Addition of the fibre reinforcement was investigated as a potential means of improving crack resistance. Grout and soil cements with and without polypropylene fibres were subjected to different curing and exposure conditions and tested for initial and final permeability. Permeabilities under saturated flow conditions were compared to determine whether fibres could control permeable microcracking of subsurface containment barriers. Fibrillated polypropylene fibres reduced the relative change in permeability for grout and soil cement cured in water and subjected to wet-dry cycles, but did not show significant benefit for materials cured in soil and allowed to dry. Addition of monofilament fibres to barrier materials caused an increase in post-cracking permeability compared with unreinforced materials. This was attributed to increased flow paths created at failed fibre-matrix interfaces.
Permeability of microcracked fibre-reinforced containment barriers
Cement-based containment barriers for waste landfills are at risk of cracking, thereby reducing effectiveness. Improved resistance to formation of permeable cracks will enhance the performance of cementitious hydraulic barriers exposed to excessive drying or to wet-dry cycles. Addition of the fibre reinforcement was investigated as a potential means of improving crack resistance. Grout and soil cements with and without polypropylene fibres were subjected to different curing and exposure conditions and tested for initial and final permeability. Permeabilities under saturated flow conditions were compared to determine whether fibres could control permeable microcracking of subsurface containment barriers. Fibrillated polypropylene fibres reduced the relative change in permeability for grout and soil cement cured in water and subjected to wet-dry cycles, but did not show significant benefit for materials cured in soil and allowed to dry. Addition of monofilament fibres to barrier materials caused an increase in post-cracking permeability compared with unreinforced materials. This was attributed to increased flow paths created at failed fibre-matrix interfaces.
Permeability of microcracked fibre-reinforced containment barriers
Untersuchung der Durchlässigkeit faserverstärkter Wände von Schutzumhüllungen mit Mikrorissen
Allan, M.L. (author) / Kukacka, L.E. (author)
Waste Management ; 15 ; 171-177
1995
7 Seiten, 6 Bilder, 2 Tabellen, 11 Quellen
Article (Journal)
English
Mülldeponie , Deponieabdichtung , Polymerbeton , Zement , Bentonit , Brauchwasser , Sand , Weichmacher , Mischen (Feststoff) , Polypropylenfaser , Faserverstärkung , Mikroriss , Rissbildung , Rissneigung , Trocknen , Durchlässigkeit , Permeabilität , Diffusion , Wasserdichtigkeit , Mischungsverhältnis , Risswiderstand
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