Author(s) :

Dahiru, H., Kundiri, A.M..

Volume/Issue :

Abstract :

This paper presents an experimental study of the effect of Compaction energy (Standard Proctor SP and Modified Proctor MP) on Compressive strength of Rice Husk Ash treated Black Cotton Soil. Eighty (80) different samples of Black Cotton Soil (BCS) treated with 5, 10 and 15 % Rice Husk Ash (RHA) were prepared using two compactive efforts of Standard Proctor (SP) and Modified Proctor (MP) at 2 and 4% on the dry and wet sides of optimum moisture contents (OMC). According to the results the soil was classified as A-7-5(18) by American Association of State Highway and Transport Officials (AASHTO) classification system and Silt of high plasticity (MH) in accordance with Unified Soil Classification System (USCS). Addition of RHA contents resulted in to an improvement in the index properties of the soil; increase in Maximum dry density from 1.41 to 1.53 Mg/m3 and decrease in OMC from 28.8 to 18%. The increase in RHA contents up to 10 % brought about significant improvement in the strength of the soil specimens from 67.2 to 299.6 kN/m2 and from 95.4 to 332.4 kN/m2 for SP and MP compaction energies respectively. This improvement is mostly on the dry sides than on the wet sides of the optimum. The analysis of variance (ANOVA) carried out on the test results depicts the statistical significance of the compactive efforts in the improvement of the strength, with more influence on the modified proctor than that of standard proctor.

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