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Sepehr Saedi Sadegh Samadi


According to the limitations of fossil fuels and taking into account environmental conditions and in order to prevent environmental pollution, vast studies are underway on improving the characteristics of this type of asphalt in the world. Cold-mix asphalt, in comparison to Common asphalt mixtures, has advantages and disadvantages. Most of the benefits of cold asphalt mixtures are low temperature, environmental considerations, less fatigue (aging), reduced fuel consumption and longer run times for asphalt over the years, its ability to carry over long distances, reduced production temperatures, and pavement density. In the case of the disadvantages of this type of asphalt mix, the weak performance of this asphalt can be pointed out in the case of moisture susceptibility and weakness against the phenomenon of rutting. In this study, the mixing of aggregates with emulsion bitumen using Marshall Design method was used and 60 samples of Marshall were prepared. After determining the percentage of optimum bitumen using experimental relations, 1 to 6 percent of Portland cement was added to the samples. Samples were tested, boiling water, Marshall Stability, Psychic, Marshall Index and sideways tensile strength test. Based on the results, with increasing cement percentage, the bitumen continuity and aggregates was improved, due to continuous grading and Marshall Stability cement samples have been increased, this amount increases to 5.3 times the Marshall Stability of cement-free samples. The results of the Marshall Index test indicate a more rigid behavior of these types of mixtures so that semi-warm asphalt mixtures with continuous grading and cement-containing materials can exhibit more resistance to permanent deformations. The results of the sideways tensile strength ratio indicate that the use of cement improves the resistance of this type against moisture crashes. According to the results of the experiments, the use of 4% cement can be considered as the optimum amount of cement used in the preparation of these types of asphalt mixtures.

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Civil Engineering