Improvement of Sub Grade Soil Using Nylon Fibers

Abstract

Rapid population growth, increasing user demand of land for living, transportation, industry
Initialization, educational institution and various types of power stations built on the sub-soil.
For the construction of new infrastructures it is important to have a high strength (quality) of
Soil and along with the possible effect of cost-effective and also fully save the environment. Nowadays, it is the major challenge for civil engineer to improve sub grade soil for construction work. Recent illustration about construction of highway or roadway is weak sub grade soil. Soil reinforcement is the method associated with the increase of strength and decreases the deformation properties of soil. This paper discussed regarding the effects of fiber on the CBR value of a clay soil reinforced with Nylon fibers. A series of CBR tests were conducted on samples of unreinforced and reinforced clay with different percentages of randomly distributed nylon fibers. The soil samples were prepared by its Maximum Dry Density (MDD) and Optimum Moisture Content (OMC) as well as in this study, different percentage of fibers by dry weight of soil is used. The CBR values have been founded from present investigation are 3.55, 4.57, 7.70, and 7.83 by using 0.0%, 0.25%, 0.5% and 0.75% of Nylon fibers respectively for 30 mm length. Correspondingly, the CBR values have been founded from present investigation are 3.55, 5.31, 8.20 and 9.22 by using 0.0%, 0.25%, 0.5% and 0.75% of Nylon fibers respectively for 60 mm length. Also, the diameter of the nylon fiber was constant at 1 mm. This investigation exemplify that the CBR value increased significantly with the percentages and length of the nylon fibers. For the greater value of CBR thickness of the pavement will reduce.