نوع مقاله : مقاله پژوهشی
1 دانشیار، دانشکده مهندسی عمران، دانشگاه خواجه نصیرالدین طوسی، تهران، ایران
2 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه خواجه نصیرالدین طوسی، تهران، ایران
عنوان مقاله [English]
Asphalt concrete cracking in cold regions is one of the most critical damages of asphalt surfaces. In addition to the cold in some regions, we also see rain that the combined effect of these two factors causes frozen asphalt. In this case, asphalt damages will drastically increase. In this paper, the fracture resistance in saturated hot mix asphalt samples under the influence of freeze and thaw cycles will be studied. For this purpose, a few asphaltic samples that have similar materials, aggregation and construction conditions were made as SCB, then they were saturated. Then different temperatures (-5 and -15°C) and cycles (1, 3, 5, 7, 9, 11) were applied to them. The effect of these parameters on the critical stress intensity factor was studied in 4 fracture moods: tensile mood,(tensile mode, shear mode and two mix modes). The result of this study shows that by increasing the number of freeze and thaw cycles, the fracture toughness will be reduced significantly. As it is, until the seventh cycle, the decrease of the fracture toughness will be increased significantly, and after the seventh cycle, its severity will be decreased. The other result of this study is that with a temperature drop of -15 ° C, the fracture toughness will be increased.