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پژوهش های آبخیزداری، جلد ۲۹، شماره ۲، صفحات ۰-۰
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عنوان انگلیسی Comparison different formulation of biopolymer on dust stabilization and aggrigate resistance
چکیده انگلیسی مقاله most conventional methods use chemical polymers and petroleum products (particularly, in arid and semiarid zones) to stop dust storm which are considerably labor, cost and time consuming. Use of the chemical polymers have several drawbacks such as high price of chemicals and their potentially harmfulness to environment. Using bio polymers has received worldwide attention during the last two decades owing to their great potential as a soil additives to stabilize the soil. The results obtained from different types of biopolymers or biopolymer compositions implicitly represent them to be applicable for binding the soil particles at the surface of light soils. Application of biopolymer as a stabilizer has proved to be effective for prevention of sand storms by stabilizing soil structure. The objective of this study is to use and screen a series of biopolymers to quantify their effectiveness as dust stabilizer in the laboratory scale. In this study, four biopolymer stabilizers compatible with the local environment will be used. In order to assess the influence of biopolymer upon topsoil stabilization, laboratory tests on unconfined compressive strength, shear strength, wet aggrigate stability and erosion resistance of untreated and treated soil samples will be performed. In laboratory the wind speed in the tunnel will be gradually increased from 25.6 m/s during 15 minutes . The wind erosion and aggregate stability test results clearly indicated that S3, S4, S5, S6, S7, S8, S9, S10, S12, S14 specimens were useful to control Dust, in the relatively arid and semiarid areas. The SEM image showed that when bio-mulches were applied to sandy soil, a part of them filled up the voids of soil, and other part stayed on the soil aggregates surface. The polyelectrolyte groups in its molecular structure had chemical reaction with positive ions of clay grain and create physicochemical bonds between molecules and soil aggregates with ionic, hydrogen, or Van der Waals bonds. Untreated sample hadn’t bonds between molecules and soil aggregate. Therefore, the strength and erosion resistance were very weak.
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