Estimate the Compression index, Swelling and Preloading Coefficient in the Presence of Special Restorative of Clay - Gypsum soils

Authors

Hydraulic structures department, Shahid Chamran University (SCU), Ahwaz, Iran

Abstract

      Water withdrawal is done after a long time in the fine soil (clay) due to low permeability and water absorption of clay minerals then estimated consolidation settlement is necessary. Obviously, if it does not predict, then amount of settlement causes irreparable damages. Soil potential should determine the amount and type of settlement before implementing any project. One method of consolidation settlement calculation is using coefficients which are obtained from consolidation tests. These coefficients include compression index, swelling index, preload index. Therefore, in this study, special concrete which restorative used for stabilization of gypsum soil. special concrete restorative material is based on cement. special concrete restorative is  added with rates of 1, 2, 3, 5 and 7 to the soil for soil stabilization. Soil classification testing, specific gravity test, compaction, determination of the Atterberg limits and consolidation were performed on controled and improved soils according to the existing standards. Chemical analysis was also done to determine the values ​​of the elements in the soil. After the geotechnical testing and characterization of physical and chemical analysis of soil samples from the controlled and improved, it was found that Cc is reduced at 85% compaction and for all rates when special concrete restorative was added. Except rates of 1 and 5 of the special concrete restorative additives, Cc has dropped for the 95% compression. Also, except for 2 and 5 percentages of the special concrete restorative additives, Cc has reduced for the 100% compression. Cs has reduced 76% at the best state of 85% compaction. Cs has reduced 63% at the best state of 95% compaction. Also, Cs has not change at 100% compaction.
 

Keywords

References

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