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Evaluation Some Atmospheric Factors on Cold In-Place Recycling (CIR) Mixtures

Hajiseyednasir, Mohammad Hossein | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57663 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sabouri, Mohammad Reza
  7. Abstract:
  8. Recent advancements have led to the widespread adoption of cold asphalt mixtures, primarily due to their numerous benefits, including reduced fuel consumption and lower emissions of harmful gases such as CO2. These mixtures are utilized for various applications, notably in road repair and maintenance. The duration required for cold asphalt layers to attain the requisite mechanical strength is termed the curing time. Various transportation agencies and authorities employ different methodologies to ascertain this curing period. Some agencies determine it based on the minimum moisture content of the mixture, often cited as 1.5% in several studies. Others prescribe a curing duration ranging from 10 to 14 days. Non-compliance with these specified time frames can result in multiple issues early in the construction season, necessitating repairs and refurbishments. However, the guidelines provided by relevant organizations are generally broad, and the influence of weather conditions on these time frames has not been comprehensively investigated. This research undertakes a detailed examination of the factors influencing the curing time of asphalt mixtures. Laboratory simulations of weather conditions, including wind, rain, and mixing temperature, were conducted on prepared samples to evaluate their impact on cold asphalt mixtures. The findings indicate that wind presence increases the evaporation rate in both cement-containing and cement-free samples, although it does not significantly affect the mechanical strength of the samples. In the event of rainfall, cement-containing mixtures require approximately one week to regain their initial strength, whereas cement-free mixtures necessitate at least two weeks. An increase in mixing temperature did not significantly impact the143trengthh of cement-containing samples; however, in cement-free samples, the optimal bitumen content decreased, although the overall strength remained relatively unchanged. In summary, cement-containing samples exhibit superior performance in terms of strength recovery under varying weather conditions compared to cement-free samples
  9. Keywords:
  10. Cold Mix Asphalt ; Asphalt Emulsion ; Experimental Investigation ; Curing ; Atmospheric Factors

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