ارزیابی آزمایشگاهی کاربرد تراشه آسفالت بازیافتی و خاکستر بادی بر مقاومت سایشی و مقاومت در برابر ضربه روسازی بتن غلتکی

In recent years, due to the high costs of pavement construction and environmental considerations, various recycled materials have been used in the roller compacted concrete pavements. On the other hand, due to the increase in the price of bitumen in flexible pavements, the use of roller concrete in the construction of pavements seems to be more economical. In this research, the mechanical properties, abrasion resistance and impact resistance of rolled compacted concrete containing recycled asphalt and fly ash have been investigated. A total of 15 mixture design were studied with replacement amounts of 10%, 20% and 30% of fly ash as a substitute for cement and 5%, 10% and 15% of fine-grained recycled asphalt as a substitute for aggregate. In order to determine the optimal amount of fly ash, first, compressive and bending strength tests were performed on 7-day samples containing 10%, 20% and 30% of fly ash, and the optimal percentage was obtained. Therefore, in mixtures 4 to 6, the amount of fly ash to replace cement for all mixtures was considered the optimal value (10%). It should be noted that for more accuracy, the 28-day samples containing different amounts of fly ash were also examined. Results of this research showed that the use of fine-grained recycled materials at the rate of 5%, 10% and 15% along with 10% of fly ash led to an increase in compressive strength by 20%, 12% and 4%, bending strength by an average of 10% and tensile strength on the average is about 40% compared to control sample. However, all samples containing recycled asphalt have shown a significant decrease in abrasion resistance. [ABSTRACT FROM AUTHOR]