Browsing by Author "Kumar, Kallempudi Pavan Mahesh"

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    Performance Evaluation Of Microsurfacing Mix Containing Reclaimed Asphalt Pavement
    (Department of Civil Engineering, NITS, 2022) Kumar, Kallempudi Pavan Mahesh
    The current size of the road network, along with a lack of adequate funds for its renovation, has prompted the development of technologies for repairing and maintaining existing pavements. Microsurfacing is one of the most advanced pavement surface treatments available, capable of treating a wide range of pavement distresses while also having a longer shelf life than other options. In this case, RAP materials created during the maintenance and rehabilitation of asphalt pavements can be consumed as part of the required materials in the same process, minimizing material costs and difficulties caused by RAP production. Sustainability, economic benefit, reduced pollution, and the preservation of natural resources are all aspects that encourage the reuse of RAP. We receive largely fine aggregates when we remove the RAP material from the old pavement, which are needed for the microsurfacing mix. The tensile strength of microsurfacing mixtures is one of the most important factors in pavement deterioration and collapse. As a result, the effects of reinforcing microsurfacing mixtures with polypropylene fibres, as well as their engineering performance, were explored in this work. In this investigation, RAP aggregates contained small contaminants, according to FTIR measurements. As a result, these aggregates can be classified as medium-quality aggregates, and the presence of morphological matter in RAP qualifies them for microsurfacing. As a virgin binder, cationic slow setting bitumen emulsion CSS-1 is used. Because a polymer modified emulsion is required for microsurfacing, the emulsion is modified by adding 5% SBS polymer rubber to increase the emulsion's characteristics. The use of fiber reinforcement in microsurfacing improves the performance properties of the material. In the entire investigation, 0.2 % polypropylene fiber by weight of total microsurfacing mix is considered. Various physical property testing for natural and RAP aggregates were conducted, including abrasion value, specific gravity, and water absorption tests. The obtained are in the permissible limit hence we can use directly in the mix. It is carried out penetration test, ductility value, softening point, and specific gravity for bitumen emulsion. The flow value of the mix is increased by adding superplasticizers, and the water content is increased by adding RAP. Increased water content and superplasticizers in the microsurfacing mix alleviate the balling effect problem caused by fibers and fine particles. To determine the performance parameters of microsurfacing mix with various percentages of RAP replacement, prepared specimens are evaluated for marshal stability, ITS, cantabro abrasion loss, and static creep test. The ideal emulsion content for the microsurfacing mix is calculated using an average of the emulsion contents achieved at Marshall stability, 4% air voids, and a bulk density of 13.33 %, which can be used for future testing with RAP aggregates. In comparison to other combinations of mixes with RAP replacement, the results indice 45% as the optimum RAP replacement percentage that can replace conventional aggregates in microsurfacing mixes because it showed the best overall performance in terms of volumetric properties and performance tests. ln comparison to other RAP-replacement mixtures that have been examined So, if a higher percentage of RAP is necessary, we can use up to 45% without compromising the microsurfacing mix's desired performance. Improved RAP material usage could be a critical step in developing long-term pavement infrastructure.