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Title: Investigating the Performance of Geocell Reinforced Unbound Layer Using Light Weight Deflectometer
Authors: Altaf, Junaid
Supervisor: Chopra, Tanuj
Pathak, Rajesh
Keywords: Geosynthetics;Geocell;LWD;Modulus;MIF;FEM
Issue Date: 17-Oct-2022
Abstract: Rapid road infrastructure construction has become a trend in India and around the world. Many road projects have necessitated early-stage maintenance during the last few decades. To figure out what's causing it, a structural evaluation study is needed to analyze the existing material qualities of the pavement. Many studies have evaluated flexible pavements using widely used NDT technologies such as LWD, BBD, and FWD. While LWD is gaining acceptance and popularity as an in-situ spot-testing device all over the world, only a few studies have been done and are necessary to be carried out in India in order to make the use of the LWD technique beneficial in road repair projects. The primary objective of this research is to use LWD to estimate the subbase surface and subgrade modulus of the unreinforced and reinforced sections and to provide rehabilitation options based on the LWD results. The lightweight deflectometer (LWD) is a highly advanced and sophisticated device that was developed to evaluate the deformation modulus (Esub LWD) of compacted geomaterials as an alternative density test. One of the ground improvement techniques rapidly expanding is geosynthetic soil reinforcement, primarily due to cost-effectiveness, simplicity, and ease of construction. The most recent development in the field of geosynthetics soil reinforcement is the use of geocells at the base and subbase courses of the pavement systems. Geocells improve pavement performance while also attaining sustainable goals, as shown by research, testing, field trails, and case studies. This research aimed to figure out what causes improved bearing capacity and what benefits geocells deliver. Geocell was used in this study in a variety of layouts and sizes with gradation (Grade I as per MoRTH for both Laboratory and Field Evaluations. It was also discovered that the best performance is achieved when a geocell of height 125 mm layer is installed in the unbound layer. The performance improvement was presented in terms of Modulus Improvement Factor (MIF). This study intends to use the LWD device and present the ranges of deformation modulus for various geomaterials from several studies. For instance, in the case of soils and aggregates, deformation modulus values were found to be in the range of 35-60 MPa and 80-120 MPa, respectively. In addition, several studies have been compiled to completely comprehend the relationship between LWD and various geocell layouts. In addition to the cost savings, this would v conserve natural materials like aggregates used in pavement construction. Overall, the inclusion of geocell in the subbase layer helps improve the life, uniform distribution of load and provides an economical and sustainable solution to the present practices. Finite Element Analyses (FEA) were used in the investigation, and the results were confirmed through laboratory tests. The objective is to understand the behavior of unpaved roads with unreinforced and geocell-reinforced subbase. Based on FEA and laboratory evaluation, the study investigated that the geocells are beneficial when construction is performed with a lower/marginal subbase and subgrade material. The geocells allow placement on top of the weak quality subgrade.
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