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首页> 外文期刊>International Soil and Water Conservation Research >Combined effect of micro silica with clay, and gypsum as mulches on shear strength and wind erosion rate of sands
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Combined effect of micro silica with clay, and gypsum as mulches on shear strength and wind erosion rate of sands

机译：硅微粉与粘土和石膏覆盖对砂土抗剪强度和风蚀率的联合作用

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Mulching is known as one of the fastest strategies to control wind erosion and sand dunes movement. We hypothesized that mixed micro silica with clay, gypsum and clay-gypsum as mulches will increase shear strength, threshold friction velocity and decrease soil losses of drifting sands. For this purpose, mixture of micro silica rates (0, 1, 5, 10, 15 and 20%) with clay, gypsum, and clay-gypsum applied on sand surfaces. After 60 days of mulching, shear strength, the threshold friction velocity and soil losses at a wind speed of 15?m/S at the height of 20?cm for 20?min. The results of this research revealed that the addition of 10% of micro silica in combination with clay and clay-gypsum increased the shear strength up to 10.6 and 37.5% and the threshold friction velocity up to 45.2 and 48.5%, respectively and decreased soil losses up to 100% in comparison with the samples without micro silica. Adding micro silica to gypsum had no considerable effect on shear strength, threshold friction velocity and soil losses. It was concluded that no pozzolanic reaction occurred between micro silica and gypsum and it was found that improvement in mechanical property and erodibility of clay-gypsum mulch was probably due to the pozzolanic reaction between micro silica and clay. Application of 10% of micro silica in combination with clay or clay-gypsum is therefore recommended as suitable mulch.
机译：覆盖被认为是控制风蚀和沙丘运动的最快策略之一。我们假设将微硅粉与粘土，石膏和粘土-石膏混合作为覆盖料将增加剪切强度，阈值摩擦速度并减少流沙的土壤损失。为此，将微硅粉比例（0％，1、5％，10％，15％和20％）与粘土，石膏和粘土-石膏的混合物涂在沙子表面。覆盖60天后，在20？cm的高度下，风速为15？m / S，20？min时的抗剪强度，临界摩擦速度和土壤损失。这项研究的结果表明，添加10％的微硅粉与粘土和粘土-石膏组合，剪切强度分别提高到10.6和37.5％，极限摩擦速度分别达到45.2和48.5％，并减少了土壤流失与不含微二氧化硅的样品相比，最高可达100％。在石膏中添加硅微粉对剪切强度，阈值摩擦速度和土壤流失没有显着影响。结论是，微二氧化硅和石膏之间没有火山灰反应，并且发现粘土-石膏覆盖物的机械性能和可蚀性的改善可能是由于微二氧化硅和粘土之间的火山灰反应。因此，建议将10％的微硅粉与粘土或粘土-石膏结合使用作为合适的覆盖物。

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