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Investigation of the Effect of Fibers on the Performance of Cold Recycled Asphalt Mixtures

Sadeghi, Mohammad | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54526 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sabouri, Mohammad Reza
  7. Abstract:
  8. Despite major environmental and economic benefits of cold recycled asphalt mixtures, many agencies have not yet made widespread use of this technology due to its so-called poor field performance and lack of accurate information on mechanical properties of cold recycled mixtures. Fiber is one the additives that is sometimes used to enhance asphalt mixture properties. Using fibers to improve the performance of cold recycled asphalt mixture has been studied by a few researchers with somehow contradictory results. In this research, the effects of adding four synthetic fibers (Polypropylene, A-glass, Para-Aramid, and Polyester) and two waste fibers (Waste Polyester and Waste Nylon) with different lengths and amounts on the performance of cold recycled asphalt mixtures are investigated. The optimum fiber content and length are determined based on dry and wet indirect tensile strength tests, indirect tensile strength ratio, and Cracking Tolerance Index (CTIndex). Next, performance of mixtures containing the optimum fibers as well as those at optimum fiber and 2% cement were investigated using Semi-Circular Bending (SCB) test. Results indicate that the length and content of fibers play a major role in performance of cold recycled mixtures. The use of fibers in most cases has the capacity to increase dry strength and fracture parameters, while reduces the wet strength of the mixture. In most cases, the use of fibers along with cement, while maintaining positive properties of mixtures containing cement, compensates for the undesirable moisture susceptibility. The overall performance of the waste fibers is also satisfactory. In addition, a new method for determining CTIndex is proposed for cold recycled mixtures
  9. Keywords:
  10. Cements ; Fibers ; Reclaimed Asphalt Pavement (RAP) ; Asphalt Emulsion ; Cold Asphalt ; Fibrous Asphalt ; Cold Recycled Mixtures

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