Expansive soils are a worldwide problem, causing extensive damage to civil engineering structures. Jones and Holtz estimated in 1973 that the annual cost of damage in the United States due to expansive soil movement was $2.3 billion. Utility of fly ash in expansive soil stabilization is established by accessing the extent of improvement achieved in relevant Engineering properties of expansive soil such as Plasticity, Compaction, Compression strength, CBR value and Swelling Index This paper presents experimental results based on analysis of swelling pressure of expansive soil - Fly ash mix could be increased by addition of randomly distributed Nylon fibres. The effect of addition of Nylon Fibres on compaction characteristics, swelling pressure is studied. Reinforcement content, varying from 0.25 % to 1.25 % by dry weight was added to stabilize the soil- flyash mixtures. Samples were prepared at optimum moisture content and maximum dry density and were cured for different duration in the laboratory under controlled conditions. The mathematical models have also been developed to correlate swelling pressure with different parameters. The developed mathematical model is adequate to represent the relationship and useful to predict the strength. Adequacy of developed mathematical model has also been tested by conducting different verification experiments. It is observed that difference between predicted and observed value is lying within 10%. A Mathematical model represented by response equation has been developed, considering only liner and quadratic effects of percentage of fibre reinforcement and length of fibres. The appropriate equation has been decided and coefficients have been determined using MATLAB software.
Fly ash, HT Nylon 66 Fibre, Swelling Index, Mathematical Modelling
e-ISSN: 2319-183X, p-ISSN: 2319-1821 Source Type:
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