GRD Journals- Global Research and Development Journal for Engineering | Volume 6 | Issue 1 | December 2020 ISSN- 2455-5703
Designing of Flexible Pavement by using Geosynthetic Material (Cotton Fiber) B Mary Devika Department of Civil Engineering Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh B Durga Vara Prasad Department of Civil Engineering Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh
K Suseela Department of Civil Engineering Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh
Abstract Soil stabilization is the process which involves enhancing the physical properties of the soil in order to improve the strength, durability etc. by blending additives. By blending cotton fibers to the soil the CBR values will improve and thickness of pavement layer also reduces. By the application of soil stabilization method in construction the cost gets reduced. The liquid limit of the soil with addition of cotton fibers was found to be decreasing when compared to liquid limit of soil alone. The plastic limit of the soil decreases with the blending of fibers. The shrinkage limit of the soil was increased with increase in fibers. The MDD of the soil with addition of cotton fibers by weight of soil is found to be increasing upto 0.75% after that it decreases and the corresponding OMC is decreased with addition of fibers. The shear strength of soil decreased substantially with addition of cotton fibers. The CBR value of the soil increased substantially. Different tests were conducted in order to determine the different characteristics and properties of the red soil and obtained with following results. The liquid limit of the soil alone was found to be 36.6%. The MDD of the soil with addition of 0.25%, 0.5% cotton fibers by weight of soil is found to be decreased by 0.84% and 0.76% , 1.0% cotton fibers by weight of soil is found to be increased by 0.11 % and 16.98% respectively and the corresponding OMC is decreased by 15.62%, 21.87% and 33.75% respectively. The shear strength of the soil with the addition of 0.25%, 0.5%, 0.75% and 1% of cotton fibers is found to be decreased by 38.57%, 38.57%, 35.25% and 5.85%. The CBR value of the soil with addition of 0.25%, 0.5%, 0.75% and 1.0%, cotton fibers by weight of soil is found to be expanded. flexible pavement design thickness before stabilization is obtained as 450mm and after stabilization is obtained as 250mm.The estimated cost for constructing flexible pavement before stabilization of soil is obtained as 4018051 Rs/Km and after stabilization of soil is obtained as 3721895 Rs/Km. the estimated cost after stabilization is found to be decreased by 7.35%. Keywords- Cotton Fiber, CBR Test, Stabilization
I. INTRODUCTION The land is used everywhere for different structures, from ordinary buildings to skyscrapers, bridges to airports, and from rural roads to expressways. All the civil engineering structures are located on different soil sheets. Soil can be elucidating as a material consisting of rock particles, sand, silt, and clay. On average 1 lakh sq. km area is covered by lateritic soil deposits, 5 lakh sq. km area is covered by sand dunes and 3 lakh sq. km area is covered by black cotton soil. Geo synthetics are synthetic products made from many types of polymers which may be either woven or Non-Woven. Polymers are used to enhance the characteristics of soil and have provided a practical way of constructing civil engineering structures economically. In this study, we are employing bamboo fibers as geosynthetic material for the stabilization of soil. Soil properties differ greatly and the construction of structures depends on the soil's bearing capacity, so to increase the load-bearing capacity, we need to stabilize the soil. Soil gradation is also a very significant function to keep in mind when dealing with soils. The soils may be well-graded, which is desirable since they have fewer voids or graded uniformly, which although sound stable, has more voids. During the construction phase, if weak soil strata are encountered, the usual practice followed is replacing the weak soil with some other good quality soil. The cost of subgrade preparation by replacing the poor soil with good quality soil is higher than that of subgrade preparation by using various stabilization techniques to stabilize the locally available soil. Stabilization can effectively increase the strengthgiving parameters of the soil to the required amount. It enhances the strength of the soil, thus, improving the soil bearing capacity. It is more economical both in terms of cost and energy to improve the bearing capacity of the soil rather than going for a deep foundation or raft foundation ItIt is often used on slopes to provide the soil with more stability. Sometimes soil stabilization is also used to stop soil erosion or formation of dust, which is very useful mainly in dry and arid weather. For soil water-proofing, stabilization is often done; this prevents water from entering the soil and thus protects the soil from losing its strength. It makes it easier to decrease the change in soil volume due to changes in temperature or moisture content.
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