International Journal of Science, Engineering and TechnologyAuthors: SK.Juned, Assistant Professor M.Harish kumar
Abstract: One of the most important things a country can do for its social and economic growth is to have a good road network. In order to build, maintain, and expand roads, a substantial quantity of building material is needed. Hence, there is a scarcity of traditional materials that can be used to build the subbases and base layers of flexible pavements. The extraction of high- quality natural resources is also getting more costly. Increasing efforts to promote the use of marginal materials in road building have been made on a worldwide scale in recent times. Costs are reduced, pressure on high-quality aggregates is relieved, and the environment is protected. This research suggests constructing roads using recycled materials and industrial solid waste. Laborotary and field investigations are part of the experimental program. In the lab, we test several waste material trial mixes to find the best ones by measuring their compaction properties, unconfined compressive strength, CBR, and resilient modulus. The optimal mixtures were then subjected to a durability test. An assortment of mixes using reclaimed asphalt pavement (RAP), construction and demolition debris (C&D) waste, natural aggregates (NFL), quarry fines (QFL), fly ash (FC.), and black cotton soil (BCL) are subjected to the experiments. You may use the RFL, CFL, and NFL mixes as base course materials in a flexible pavement system, and the QFL, FC., and BCL mixes as subbase course materials. Wet mix macadam (WMM) and granular subbase (GSB) are two examples of traditional aggregates that these waste mixtures for base and subbase courses are compared to. In order to find the best mix proportions, we tested several combinations of the recommended base and subbase materials according to the Indian Road Congress's specifications for strength and durability. When compared to more traditional materials, the ideal combination of base and subbase performs better in terms of resilience modulus and strength. The primary objective of this extensive study was to analyze the field performance of the chosen design in laboratory trial experiments. Over the course of two years, a falling weight deflectometer was used to assess the test portions' structural integrity. To determine the level of pozzolanic reaction in these waste mixtures, core specimens were taken from the test sections two years after construction and subjected to X-ray diffraction and scan electron microscopy experiments. Using a variety of performance metrics, such as deflection basin parameters, composite modulus, and back-calculated modulus, structural evaluations of test sections have demonstrated that flexible pavement using these various waste mixes outperforms flexible pavement using natural aggregate base and subbase (WMM & GSB). In this research, we compare the service life ratio of a flexible pavement with optimal stabilized mixes in the base and subbase course to that of a traditional wet mix macadam (WMM) and granular subbase (GSB) layer using the IITPAVE software. Pavement consisting of conventional materials has a shorter service life compared to pavement with stabilized mixtures as the base and subbase course, as measured by the fatigue and rutting failure criterion. Additionally, employing RFL, CFL, and NFL mixes in the base and QFL and BCL mixes in the subbase layers of flexible pavement can minimize the construction cost.
