Shabnam Keshvari - Department of Civil Engineering, Isfahan University of Technology,
Mohammadali Rowshanzamir - Department of Civil Engineering, Isfahan University of Technology,
Sayyed Mahdi Hejazi - Department of Textile Engineering, Isfahan University of Technology,

Uniform sandy soils due to their lack of cohesion and low compressibility are frequently regarded as problematic soils for construction purposes. Thus, it is usually required to employ appropriate methods for improving the soil properties. In this study, a series of laboratory experiments were conducted to investigate the effect of sodium caseinate resin and polypropylene fibers on mechanical properties of sandy soils. Sodium casheinate is a proteinaceous substance derived from casein derivatives obtained from milks and it is known for being environmentally friendly and may be used as an appropriate soil stabilizer. Polypropylene fibers were used for soil reinforcement due to their tensile properties. In this Research 1% resin and polypropylene fibers of 12 mm in length at content of (0, 0.05%, 0.1%, and 0.15%) have been added to casein modified soil. The main objective of the study is to improve the properties of sandy soils, particularly their strength. For this purpose, direct shear test with 3-day treating time has been used

sodium caseinate resin, polypropylene fibers, reinforced sandy soils, shear strength