The long-term aging of the asphalt mixtures has become a major concern because it decreases the lifespan of the asphalt layer. In this study, the asphalt mixtures incorporating steel slag aggregates were reinforced with synthetic fibers as a novel contribution in terms of decreasing the effect of aging on the performance of the asphalt mixtures. However, different mixtures—namely, Mix0, Mix1, and Mix2—were subjected to long-term oven aging to study the effect of the aging on the performance of the asphalt mixes. Mix0 consisted of coarse and fine granite aggregates, while Mix1 was composed of coarse steel slag aggregate and fine granite aggregate. Mix2 represents the reinforced asphalt mixtures incorporating coarse steel slag aggregate and reinforced with the synthetic fibers of polyvinyl alcohol, acrylic, and polyester at the proportion of 0.3% by weight of the aggregates. The conducted performance tests were resilient modulus, rutting depth, and cracking resistance. The outputs of the performance tests for the unaged asphalt mixes displayed that the mixtures incorporating coarse steel slag aggregate exhibited better performance than the mixtures containing granite aggregate. Meanwhile, the reinforced asphalt mixtures have shown a lower resilient modulus and a higher permanent deformation than the unreinforced asphalt mixes due to the elastic behavior. Otherwise, the reinforced asphalt mixtures have shown superior resistance to cracking in comparison to the unreinforced mixtures. On the other hand, the performance of the aged asphalt mixtures demonstrated that the mixtures containing granite aggregates exhibited a lower susceptibility to aging than the mixtures incorporating steel slag aggregate. Meanwhile, the performance of the aged reinforced asphalt mixtures showed that introducing synthetic fibers has decreased the effect of the long-term oven aging.

中文翻译：

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长期烤箱老化对增强沥青混合料性能的影响

沥青混合物的长期老化已成为主要问题，因为它会降低沥青层的使用寿命。在这项研究中，掺入钢渣骨料的沥青混合料用合成纤维增强，这在减少老化对沥青混合料性能的影响方面起到了新的作用。但是，对不同的混合物（即Mix0，Mix1和Mix2）进行了长时间的烤箱老化，以研究老化对沥青混合料性能的影响。Mix0由粗粒和细粒骨料组成，而Mix1由粗钢渣粒和细粒骨料组成。Mix2代表掺有粗钢渣骨料并用0比例的聚乙烯醇，丙烯酸和聚酯的合成纤维增强的增强沥青混合料。占集料重量的3％。进行的性能测试是弹性模量，车辙深度和抗裂性。未老化沥青混合料性能测试的结果表明，掺入粗钢渣骨料的混合物比含花岗岩骨料的混合物表现出更好的性能。同时，由于弹性行为，与未增强的沥青混合料相比，增强的沥青混合料显示出较低的弹性模量和较高的永久变形。否则，与未增强的混合物相比，增强的沥青混合物显示出优异的抗裂性。另一方面，老化沥青混合物的性能表明，与掺入钢渣骨料的混合物相比，含花岗岩骨料的混合物对老化的敏感性更低。同时，老化的增强沥青混合料的性能表明，引入合成纤维降低了长期烤箱老化的影响。