چكيده به لاتين
In the asphalt pavement industry, various technologies have been presented to produce sustainable design. Achieving a sustainable solution to various problems such as reducing virgin material consumption, reducing energy consumption, reducing greenhouse gas emissions, landfill shortages, and economic problems have become a key priority in the asphalt pavement industry. Due to these reasons, it is appropriate to recycling construction and demolition waste and use them in the asphalt mix. In this research, the durability and mechanical properties of asphalt mixtures containing 0, 25, 50, and 100% of RCA material in both untreated and treated with bitumen emulsion have been evaluated. For this purpose, a warm organic additive (Sasobit) has been used to reduce the mixing and compaction temperature of asphalt mixtures. In general, an HMA is prepared as a control mixture and 9 WMA mix containing different percentages of CRCA materials (replacement ratio 0, 25, 50, and100%) in both untreated and treated states with emulsion bitumen. To evaluate the durability and mechanical performance of asphalt mixtures (moisture, rutting, and cracking resistance), dynamic creep test, resilient modulus (MR), indirect tensile strength (ITS), and semi-circular bending (SCB) fracture test were used. The results indicated that with increasing the percentage of CRCA, the optimum binder content in asphalt mixtures has increased. ITS results show that the use of CRCA in the treated and untreated state has increased the ITS. The mixture containing untreated CRCA has the highest ITS value. Also, the TSR results of asphalt mixtures show that CRCA and their treatment with emulsion bitumen have increased the TSR value and improved moisture resistance. On the other hand, the Resilient Modulus results show that increasing the percentage of CRCA materials' use up to 25% increased the amount of MR and then decreased. The dynamic creep test results also show that mixtures containing CRCA in the treated and untreated state have increased the rutting resistance. The asphalt mixture containing 75% of CRCA materials has shown the highest flow number. The results also showed that using CRCA materials increased and decreased the crack resistance of asphalt mixtures. Although the asphalt mixtures containing treated CRCA with emulsion bitumen have reduced the value of modulus, indirect tensile strength, and cracking resistance, they have better performance than the control mixture (HMA).
