عنوان مقاله [English]
Using tire chips as an additive to the soil is an option for reusing of the scrap tires. Due to its disk-shape, the rubber chip generally lies horizontally when it is mixed with the soil, however the effect of the chips orientation has rarely been investigated previously. In this research, the behavior of reinforced sand with rubber chips has been studied. The main variables are the rubber content and chip orientation. To maintain the orientation of chips, a novel mold has been employed. The varying rubber contents include 0, 20, 40, 60, and 100 percent by volume of the solids, and the rubber chip orientations are 0, 25, and 50 degrees. The specimens were sheared by a large direct shear test machine with the dimensions of 30 cm by 30 cm by 20 cm under three normal stresses of 30, 80, and 160 kPa. The results show that by increasing the vertical stress and the chip orientation, the shear strength of the mixture increases. By comparing the strengths, it is revealed that the sample with 60 % of rubber chip shows the highest shear strength.