Effect of nano-silica & lime on soil structure stability indices of earthy side slopes

Document Type : Complete scientific research article

Authors

1 Department of Forestry, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Department of Arid Zones Management, Gorgan University of Agricultural Sciences and Natural Resources, Iran

Abstract

Abstract
Background and Objectives: Nano-particles can be used for the soil conservation practices due to high specific area and high efficiency in low volume. Nano-particles cannot perform well individually similar to the lime. So, in this study nano-SiO2 in combination of lime was used for slope stabilization.
Material and Methods: In this study, control treatment (without nano-SiO2 and lime) and different combinations of nano-SiO2 and lime including 0.05% nano + 2% lime, 0.1% nano + 4% lime, 0.6% nano + 6% lime, 0.4% nano + 8% lime, 0.8% nano + 10% lime, 2% lime, 6% lime, 10% lime, 0.05% nano and 0.1% nano were sprayed on 0.25 m-2 plots. Treatments were conducted in three replications on cutslopes with gradient of 100% in Bahramnia forest roads. After the curing times of 7 and 28 days, soil samples were collected to measure the stability indices of soil structure using wet and dry sieving.
Findings: In this study, there wasn’t significant trend in aggregate stability indices versus increasing the concentrations of lime and nano-SiO2. Maximum values of MWDwet, MWDdry and AS was detected for treatment 3 (0.6% nano + 6% lime) in curing time of 28 days which was 66.24%, 51.01% and 72.98% higher as compared with control. Minimum rate of AS was observed for treatment 8 (10% lime) which was 82.36% lower as compared with control. All of the treatments cause to decrease DI except for treatments 1 (0.05% nano) and 8. Minimum DI was observed for treatment 3, which was 257.61% higher than control.In this study, there wasn’t significant trend in aggregate stability indices versus increasing the concentrations of lime and nano-SiO2. Maximum values of MWDwet, MWDdry and AS was detected for treatment 3 (0.6% nano + 6% lime) in curing time of 28 days which was 66.24%, 51.01% and 72.98% higher as compared with control. Minimum rate of AS was observed for treatment 8 (10% lime) which was 82.36% lower as compared with control. All of the treatments cause to decrease DI except for treatments 1 (0.05% nano) and 8. Minimum DI was observed for treatment 3, which was 257.61% higher than control.
Conclusions: Results of this study showed the positive effect of mixed treatment of lime and nano-SiO2 on stability of soil structure. 0.6% nano+6% lime had better influence on reduction of aggregate destruction percentage.Results of this study showed the positive effect of mixed treatment of lime and nano-SiO2 on stability of soil structure. 0.6% nano+6% lime had better influence on reduction of aggregate destruction percentage.

Keywords

References

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Journal of Water and Soil Conservation
Volume 27, Issue 3
September and October 2020
Pages 245-249

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