Evaluation of the effect of sand grain size on compressive strength and elasticity module of lime-treated soil

Document Type : Original Article

Authors

1 Department of Water Engineering Department, Agricultural Sciences and Natural Resources University of Khuzestan

2 Department of Water Engineering, Faculty of Agricultural Engineering and Rural Development, Agricultural Sciences and Natural Resources University of Khuzestan

3 Department of hydraulic structures, Faculty of water sciences engineering, Shahid Chamran University of Ahvaz. Iran.

4 Department of Soil Engineering, Agricultural Sciences and Natural Resources University of Khuzestan-ahvaz-Iran.

Abstract

Using additives can improve the mechanical properties of soils of construction projects such as irrigation canals. The materials such as sand, in addition to improving soil conditions, are compatible with the environment. So, in recent decades, the utilization of sandy soils in the construct of irrigation networks has been extended. In this study, the effect of size and amount of sand on the strength characteristics of lime treated soils. In this way, at first, to determine the best soil-lime mixture, the soil was mixed by different amount of lime and unconfined compressive strength of these has been investigated. The highest unconfined compressive strength was achieved by adding 7 percent lime to the soil. Then, a set of tests conducted on coarse (D50= 1.4 mm), medium (D50= 0.45 mm) and fine (D50= 0.22 mm) and by applying 5, 10 and 15 percent of sand to lime-clay mixture in three replicates. The unconfined compressive strength was performed on the specimen at curing time of 7, 14 and 28 days. Results showed that adding 5 percent of coarse sand to clay–lime mixture can increase compressive strength and elasticity module about 13 percent and 16 percent, respectively, on average. In addition, adding medium and fine sands can cause to deteriorate soil’s strength and elasticity module.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 13, Issue 5 - Serial Number 77
November and December 2019
Pages 1398-1409

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