Experimental study of investigating and comparing the effect of glass fibers of type E and AR on the stabilization of wind sand and its strength parameters on roads base

In road projects, a suitable base for project execution is essential. Many of the soil types, such as wind sand, are not suitable for road building, and there is a need to carry out operations to prepare these soils for the base. In many cases, there is a need to switch to bed soil, but it is costly and will prolong the execution time of the project. Since it is challenging to reach ideal soil for road construction projects, soil improvement is being carried out. This is done in different ways, one of which is adding different materials to the soil. In this study, this method is used to stabilize the wind sand of Yazd. Two different types of glass fibers (type E and AR) have been used in this study. In order to perform the compressive test, the soil with both types of glass fibers was mixed in different percentages of 0.25, 0.5, 0.75, and 1 percent. The results showed that the percentage of optimum moisture increased by increasing the percentage of glass fibers. It should be noted that glass fibers did not affect the maximum dry soil weight. The direct shear test was done with the same percentages used in the compressive experiment. In this experiment, adding 0.75 and 0.5 percent of the type of AR and E to soil was selected as optimal for internal friction angle and cohesion, respectively. Also, using glass fibers of type AR in the studied soil had better results.