Investigation of Strength Properties of Black Cotton Soil Stabilised with Fly Ash and Geo Reinforcement

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Investigation Of Strength Properties Of Black Cotton Soil Stabilised With Fly Ash And Geo Reinforcement

Investigation of Strength Properties of Black Cotton Soil Stabilised with Fly Ash and Geo Reinforcement

Abstract

Investigation Of Strength Properties Of Black Cotton Soil Stabilised With Fly Ash And Geo Reinforcement civil project report  An experimental investigation is carried out to study the effect of stone dust and Polypropylene fibers on engineering and strength properties of the Black Cotton Soils.

The properties of stabilized soil such as compaction characteristics, unconfined compressive strength and California bearing ratio were evaluated and their variations with content of stone dust and fibers are evaluated. Addition of either Optimum percentage of stone dust (3%) and Optimum Percentage of fibers (0.6%) or Optimum percentage of its combination to the Black Cotton Soil has improved the strength characteristics of sub grade.

Conclusion

The conclusions drawn from these studies are as follows:-

  • The consistency indices value of the black cotton soil reduces with mixing of fly ash. Initially the LL, PL and PI values of raw soil are 71.20%, 30.50 % and 40.70 % respectively which on mixing fly ash in ranges from 10 % to 40 % gradually decreased. With 40 % addition of fly ash to the soil, the LL, Pl and PI values are obtained as 45.50%, 23.60 % 21.90 % respectively. Thus, the soil plasticity is reduced on mixing of fly ash and the soil became less problematic.
  • The mixing of fly ash has pronounced effect on compaction characteristics also. In Modified Proctor’s Compaction Test, the MDD value of raw soil is achieved as 1.57 gm/cc at OMC of 18.20 %. It got increased to 1.90 gm/cc at OMC of 17.38 % on 20% addition of fly ash. However, further addition of fly ash causes reduction in MDD.