Investigation and Comparison the Effects of Waste Fiber Bundles and Waste Tire on the Strength Properties of Clayey Sand Stabilized with Cement

This study investigates the possible uses of fiber bundles, shredded tire and tire cord scrap (individually and in combination with cement) in clayey sand stabilization. Several basic characteristics of experimental specimens obtained with Atterberg limit, standard proctor compaction, and unconfined compression strength (UCS). These properties are compared with those of un-stabilized clayey sand and stabilized clayey sand with cement and the observed test results are then explained. Results of experimental study indicate that cement mixture treatments play a prominent role in reducing the soil plasticity index (PI). Furthermore, the results of the compaction test show that the utilization of waste in sandy soil stabilization decreases the optimum moisture content and also decreases the maximum dry density. Among the used waste materials, fiber bundles showed the greatest impact on maximum dry density with 1.4% reduction. The results show that using waste materials alone to stabilize clayey soil results in a slight increase in the UCS of the specimens, whereas combining waste with cement results in a sharp increase in the UCS of the samples in the same curing time. Additionally, the samples treated with fiber bundles have the most remarkable increase in UCS and maximum displacement compared to other samples, respectively 32 and 58 percent. The reason that fiber bundles becomes more efficient waste material is rooted from rising the contact area, plummeting the specific gravity and augmenting the uniform distribution in the clayey sandy soils.