Evaluation of Shear Strength of Loose Sand Soils Enriched with Waste Ash of Sabzevar Cement Factory

Document Type : Original Article

Author

Assistant Professor, Department of Civil Engineering, Hakim Sabzevari Niversity, Sabzevar, Iran.

Abstract

The existences of loose soils such as soft sands have always created concerns for bearing the load. Their inability to withstand pressure and weak shear resistance have forced engineers to move the project site or accept expensive methods such as pile driving as solutions to overcome them. Today, many additives such as polymers, lime, cement, etc. have been introduced to improve soil properties and land improvement; however, each of them, having their strengths and weaknesses, has created problems for their use. Cement factory furnace ash, which is one of the by-products in the cement production process; at the outlet, the gases released from the furnace are collected by fabric filters or electrostatic precipitators. Due to its similarity with the compounds found in cement, the compounds of this material have some of the positive properties and characteristics of cement and can be used to stabilize weak soils due to its cheapness. In this research, the effect of cement furnace ash on the engineering properties of unsuitable and weak sand-blasted soil has been investigated, in such a way that cement furnace ash with proportions of 5, 10, 15 and 20% with sand-blasted soil in the periods of 7, 14 and 28 days processing of the combination and direct cutting test have been done on them. Also, in order to create ideal conditions, the standard Proctor compaction test was used to obtain the maximum dry weight of the soil and the optimum humidity for each sample. The results of this research show that the samples with 10% cement furnace ash compared to other samples create a more ideal composition and the shear strength is more than 7 times compared to samples without cement furnace ash.

Keywords

References

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