Studying some hydro-physical properties of two soils amended with kaolinite-modified cross-linked poly-acrylamides

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• 作者：Rashad A. Hussien^a ; ^{rtalat2005@yahoo.com} ; Ahmed M. Donia^b ; Asem A. Atia^b ; Osama F. El-Sedfy^a ; Azza R. Abd El-Hamid^a ; Rama T. Rashad^a ;
• 关键词：Swelling degree ; Hydro-physical properties ; Pore size distribution ; Hydraulic conductivity ; Sandy soil ; Cross-linked hydrogel
• 刊名：Catena
• 出版年：2012
• 期刊代码：11_03418162
• 类别：ear
• 出版时间：May, 2012
• 卷：92
• 期：Complete
• 页码：172-178
• 文件大小：885 K

摘要

A poly[(acrylic acid)-m>com>-acrylamide] hydrogel was prepared in the laboratory through polymerization of partially neutralized acrylic acid (AA) in the presence of N,N鈥?methylene bisacrylamide (MBA) as a crosslinker. The polymer was prepared without an additive (H1) or with 5%(w/w) kaolinite clay mineral added during the polymerization (H2). The swelling of the hydrogel in distilled water as well as within the soil matrix was studied. Some hydro-physical properties of two different soil samples amended with the hydrogel were also studied. The S1 soil was sandy and non-saline; and the S2 soil was sandy clay loam and slightly saline. The swelling degrees (m>Sm>) in distilled water were 97.8 and 282.8 g/g of the hydrogel dried at 70 掳C, for the non-modified H1 and kaolinite-modified H2 hydrogels, respectively. The m>Sm> values of H1 and H2 hydrogels, within the S1 soil were 85.45 and 81.25 g/g, respectively. While within the S2 soil, the m>Sm> values of H1 and H2 hydrogels were 31.17 and 16.32 g/g, respectively. The change in the studied hydro-physical properties of soil treated by the hydrogel was more dependent on the soil texture and salinity and the hydrogel concentration in soil than on the swelling degree of the hydrogel. The change in the bulk density values of the soil-hydrogel mixture was in the range 90.1%-71.43%relative to the soil sample free of hydrogel. While the change in the total porosity values were in the range of 98.83%-132.64%. The effect of presence of the hydrogel on the hydraulic conductivity of the soil samples was discussed.