نوع مقاله : مقاله پژوهشی
1 دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران
2 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران
3 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه زنجان، زنجان
4 دانش آموخته کارشناسی ارشد، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران
عنوان مقاله [English]
This paper investigates the feasibility of incorporation of steel slag into the hot mix asphalt. To this end, firstly, physical phases and morphology of steel slag were evaluated through XRD and SEM. Then, seven asphalt mixture types in which different proportions of natural aggregates were substituted with steel slag aggregate were prepared and their volumetric properties and optimum bitumen contents were obtained in accordance with standard Marshall mix design. Moreover, the frictional characteristics of mixes were examined in laboratory and field by means of British pendulum and sand patch methods. Results showed that Marshall Stability, specimen bulk specific weight, and surface friction as well as bitumen consumption and air void content significantly increase as a result of incorporation of steel slag aggregates. However, while Marshall Stability and friction noticeably improved in asphalt mixes in which only coarse part of aggregates were substituted with steel slag aggregates, their air void and bitumen contents remained in acceptable range. Assessing the moisture susceptibility of mixes revealed that mixes containing steel slag are less affected by moisture. In addition, the expansion potential of asphalt mixes in which all the aggregates were replaced with steel slag aggregates found to be less than 1%.