Study of soil reinforcement in the east of Mashhad using glass granule

Abstract As waste production has increased, these materials have been put to their best use to help reduce pollution. Glass bottles account for more than 5% of municipal waste in Mashhad, according to statistics. This study attempted to look into the impact of using glass granule recycled materials on soil parameters. The impact of adding glass granule materials on the properties of weak soil and the need for improvement in the east part of Mashhad was studied. The dominant soil in the east of Mashhad was determined using samples collected from‌ 54‌ different locations. Finally, two experimental relations for determining soil strength parameters were presented. The results show that adding glass granule (GG) lowers the optimum moisture content, and CBR testing on the samples revealed that adding GG by 5% water content increases CBR capacity. Adding GG reduces the CBR in saturated conditions with high densities. According to the obtained results, adding 5% of glass granule is the optimal state that increases CBR and adding more than 5% of additive amounts does not have such an effect. Also, by examining the effect of GG on the shear strength of the soil, it was obtained that the addition of GG increases the internal friction angle of the soil by at least 30% and reduces adhesion by about 40%, as determined by a direct shear test. Adding glass granule in cyclic CBR has no effect in low cycles and has a negative effect in high cycles.