Effect of Lead Nitrate on Behavior and Shear Strength Parameters of sandy clay

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Hassanlourad Mahmoud; Hossein Zade Mohmmad; NAEINI SEYED ABOLHASSAN

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Journal: Amirkabir Journal of Civil Engineering Year:621 | Volume: | Issue: Page(s): 575-588

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Title

Effect of Lead Nitrate on Behavior and Shear Strength Parameters of sandy clay

Author(s)

Hassanlourad Mahmoud | Hossein Zade Mohmmad | NAEINI SEYED ABOLHASSAN | Issue Writer Certificate

Keywords

Lead nitrate

Kaolinite

Bentonite

Triaxial Test

Shear Strength Parameters

Abstract

By the expansion of the industrial zones, heavy metals enter the environment through industrial wastewater or leakage from storage tanks, which contaminates the soil and groundwater. The leakage of heavy metals such as lead, zinc, cadmium and etc. is not only an environmental crises, but also causes changes in soil shear resistance parameters. Type of soil and initial concentration of contamination are most prominent parameters that affect the behavior of contaminated soils. In this research, with Triaxial Tests, the behavior of sandy soils with different percentages of Kaolinite in two cases of non-contaminated and contaminated with lead is investigated. It can be seen that by increasing the lead concentration, the hydrogen bonding between Kaolinite particles reduce and it decreases the resistance of contaminated soils. By increasing the concentration of heavy metals up to 20, 000 ppm, the shear resistance of clayey sand with 15% and 25% Kaolinite decreases by 18% and 24%, respectively. Then, to investigate the effect of clay minerals on contaminated soils, the shear resistance parameters of soil with Kaolinite and soil with Bentonite are compared. The results show, with variation of clay minerals in contaminated soils, resistance parameters have different behavior. Increasing the lead concentration in Bentonite causes a flocculated structure, thus the shear strength increased. In soils with Bentonite, Shear Strength Parameters increase 20% to 30% with increasing the Lead nitrate concentration.

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