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Investigating Different Crumb Rubber Modification Methods in Cold Mix Asphalts

Daneshvar, Dana | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51072 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Motamed, Arash
  7. Abstract:
  8. Studies have shown that use of crumb rubber additive can improve the mechanical and performance properties of hot mix asphalts. Nowadays, different methods are used for adding crumb rubber to asphalt mixtures. However, no comprehensive research has been done to investigate the effects of these different methods in cold mix asphalts. In this research, different crumb rubber modification methods were evaluated to compare their effects on cold mix asphalts’ performance. In this regard, various crumb rubber modification methods, such as pre blending crumb rubber into the asphalt before emulsification, post blending crumb rubber into the prepared asphalt emulsion and blending crumb rubber with aggregates were utilized. Two indexes, fracture property and moisture sensitivity, were used to compare these modified asphalt mixtures, and finally the optimum modification method was determined. In addition, to improve the performance and curing time of cold mix asphalts, the effect of simultaneous use of cement and crumb rubber was evaluated. The results showed that simultaneous use of crumb rubber and cement in cold mix asphalts can make a comparable performance to hot mix asphalts. Also, the results showed that fine aggregate matrix samples are able to predict the performance of cold mix asphalts and can demonstrate the effects of crumb rubber and cement additives accurately
  9. Keywords:
  10. Fracture Properties ; Cements ; Modification ; Crumb Rubber Modifier ; Moisture Susceptibility ; Cold Mix Asphalt

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