eva‎luation of the fracture resistance of warm mix asphalt mixtures containing slag under fracture modes I, II and mixed mode I/II

12/17/2024 12:00:00 AM

The use of waste materials and warm mix asphalt technology in asphalt mixtures provides several benefits. Since low-temperature cracking is one of the most common deteriorations in asphalt pavements, this study aims to eva‎luate the fracture resistance of warm-mix asphalts mixtures, including slag, at low temperatures. To this end, samples containing different percentages of coarse steel slag aggregates (0%, 25%, 50%, 75%) along with a warm mix asphalt additive were prepared. A three-point bending test was conducted to assess the fracture resistance of Edge Notch Disc Bend (ENDB) specimens under pure loading modes I, II, and mixed mode I/II, as well as at three low temperatures (0°C, -10°C, and -20°C). The results of this study indicate an increase in fracture toughness and a decrease in fracture energy by increasing the slag percentage. By increasing the slag percentage to 75%, fracture toughness and fracture energy were increased by 35% and 16%, respectively. Also, decreasing the temperature had the highest effect on fracture toughness of samples containing 75% slag and leads to an enhancement of 27% in fracture toughness. Furthermore, the lowest fracture resistance occurred under the mixed mode I/II and Thus, substituting slag as a part of natural aggregates can enhance the fracture resistance of warm mix asphalts at low temperatures.

سرباره , آسفالت گرم , چقرمگي شكست , انرژي شكست

slag , warm mix asphalt , Fracture toughness , fracture energy

Taranom Tamizi

Dr. Mahmood Ameri