Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The Effects of Exopolymers on the Erosional Resistance of Cohesive Sediments
Sediment erosion threatens coastal infrastructure and natural habitats throughout the coastal United States. Conventional soil amendments, such as lime, Portland cement, and polyacrylamide, are effective for improving soil strength and resistance to erosion, but exopolymers have the potential to improve sediment stability without the environmental risks of caustic or toxic compounds. This paper describes how the erosional resistance of a pure kaolinite clay is enhanced using two exopolymer analogues, guar gum, a neutral polysaccharide, and xanthan gum, an anionic polysaccharide. A cohesive strength meter was used to measure the critical shear stress τoCr of high water content muds, representative of newly placed, hydraulically pumped sediment fill. Guar gum produces a nine-fold increase in τoCr due to increases in pore fluid viscosity and hydrogen bonding between biopolymer strands and clay particles. Xanthan gum provides much less improvement because of electrostatic repulsion. Practical applications of exopolymers for erosion control are discussed.
The Effects of Exopolymers on the Erosional Resistance of Cohesive Sediments
Sediment erosion threatens coastal infrastructure and natural habitats throughout the coastal United States. Conventional soil amendments, such as lime, Portland cement, and polyacrylamide, are effective for improving soil strength and resistance to erosion, but exopolymers have the potential to improve sediment stability without the environmental risks of caustic or toxic compounds. This paper describes how the erosional resistance of a pure kaolinite clay is enhanced using two exopolymer analogues, guar gum, a neutral polysaccharide, and xanthan gum, an anionic polysaccharide. A cohesive strength meter was used to measure the critical shear stress τoCr of high water content muds, representative of newly placed, hydraulically pumped sediment fill. Guar gum produces a nine-fold increase in τoCr due to increases in pore fluid viscosity and hydrogen bonding between biopolymer strands and clay particles. Xanthan gum provides much less improvement because of electrostatic repulsion. Practical applications of exopolymers for erosion control are discussed.
The Effects of Exopolymers on the Erosional Resistance of Cohesive Sediments
Nugent, R. A. (Autor:in) / Zhang, G. (Autor:in) / Gambrell, R. P. (Autor:in)
International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States
Scour and Erosion ; 162-171
29.10.2010
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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