Abstract
Soil is omnipresent material naturally in the universe and is the cheapest available construction material. As clay shows unfavourable behaviour as high shrinkage, swell characteristics and low bearing capacity, there is need to improve the strength characteristics. The aim of this research is to study the characteristics of soil when processed with fly ash and recron 3s. The method used in the research is randomly distributed fibre reinforcement soil also termed as RDFS. The objective of study
is to is increase the strength of clayey soil using recron 3s fibre and fly ash. The research was focused on to improve the strength of soil and to obtain a optimum amount of soil-fly ash-recron 3s mix. The proportions used of fly ash were 10, 15, 20, 30, 40 and 50% and recron 3s was in 0.2, 0.4, 0.6, 0.8 and 1.0% in amount by weight. In this study number of compaction test, unconfined compressive strength test and direct shear test were performed. From proctor test it was determined that O.M.C increases and M.D.D decreases with increase in fly ash and recron 3s. The fly ash was optimized at 15% and was used for further work. U.C.S value for virgin soil was 213.67 kN/m2, by adding fly ash it was increased to 458.13 kN/m2 at 15% fly ash. On addition of recron 3s strength was increased and maximum was at 0.8% i.e. 685.24 kN/m2 for 1 week curing and 723.87 kN/m2 for 2 week curing period. The results of direct shear were for virgin soil as cohesion intercept 25.78 and angle of shearing resistance 20.47˚ were increased on addition of fly ash and recron 3s to cohesion intercept 67.26 kN/m2 and angle of shearing resistance 28.66˚. From the experimental results it was concluded that recron 3s work as reinforcing material and provides strength to the soil as well as fly ash worked as cementing material. The preeminent proportion obtained was 82.2% soil – 15% fly ash – 0.8% recron 3s fibre.
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