Effect of nanocellulose in modifying the mechanical properties and the volume changing of the sand-silt subgrade in controlling its local rupture

In two decades, the roads of the roads in the desert areas of the desert have also been changed. Fiber-reinforced soil behavior modification studies have been performed by compaction, uniaxial compressive strength, and California load-bearing ratios. In this research, studies were performed on soil stabilization of constructing roads in sandy loam soils using cellulose nanofibers. The aim of this study was to stabilize the cracked pavement bed and strengthen it by adding nanocellulose to the soil. Physical and mechanical tests were performed to find the type of soil in the area and the effectiveness of nanocellulose. Samples in these experiments were combined with 0.5, 1 and 1.5% nanocellulose, The results obtained from the experiments showed that the addition of nanocellulose increased the liquid and plastisite between 21 to 27% and 60 to 65% and decreased the plastisite index between 25 to 40%, respectively. Optimal moisture and dry specific gravity increase and decrease, respectively. The uniaxial strength of the samples increased between 30 and 85% and the maximum CBR number up to 12 times., and the soil strength class in all samples was changed to "very good" subgrade for use in pavement. The rupture zone energy results also show that the increase in nanocellulose has a positive effect on the modified specimens and delays the occurrence of rupture cracks due to loading and volumetric changes. The response Surface statistical method was also used to predict objective variables.