Experimental Study on Rheological Property of Fly Ash Composite SBS Modified Asphalt
To conduct an in-depth study on the influence of temperature and aging on the rheological properties of fly ash composite SBS modified asphalt,3 types of modified asphalt samples were prepared:fly ash modified asphalt,SBS modified asphalt,and fly ash composite SBS modified asphalt.The influence of different temperature conditions and aging levels on these modified asphalts' rheological and fatigue properties was thoroughly evaluated by using systematic laboratory tests.The result indicates that the complex modulus of asphalt significantly increases with the loading frequency.Additionally,the unaged asphalt and short-term aged asphalt exhibit the lowest temperature sensitivity in terms of storage modulus and loss modulus;however,when the asphalt undergoes long-term aging,10％ fly ash-modified asphalt performance becomes more susceptible to temperature variation.The further analysis reveals that compared to base asphalt,the fatigue life of 10％ fly ash and 2％ SBS composite modified asphalt is significantly improved under different temperature conditions.At 10℃,20℃,and 30℃,the fatigue life increases by 60.14％,43.39％,and 48.93％ respectively.These results indicate that fly ash composite SBS modified asphalt exhibits excellent deformation resistance and fatigue performance under low-temperature conditions.Considering all factors,fly ash composite SBS modified asphalt shows significant advantages in improving asphalt performance,and holds substantial potential in extending road service life and enhancing road safety.
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