{"title":"Microwave healing properties and moisture sensitivity of asphalt mixture containing iron powder filler.","authors":"Mahmoud Ameri, Mansour Sadeghiavaz","doi":"10.1038/s41598-024-73290-2","DOIUrl":null,"url":null,"abstract":"<p><p>Through experimental tests, this paper investigated the effectiveness of microwave healing on asphalt mixtures containing iron powder (IP) filler to improve durability and enhance mechanical properties. The moisture sensitivity of the asphalt mixes with varying iron powder filler contents was measured using the modified Lottman test. For evaluating the asphalt mixture healing ability, two complementary methods were used: the fatigue-based method, derived from the ability of microwave healing of asphalt mixture samples damaged up to 50% level of indirect tensile fatigue (ITF), and the fracture-based method, obtained from the strength recovery rate of broken semi-circular samples by applying consecutive breaking-healing cycles. The results showed that the greater the quantity of iron powder filler in the asphalt sample, the greater the sample's indirect tensile strength and TSR ratio, indicating that IP had a positive effect on moisture sensitivity. The findings also indicated that utilizing iron powder as a filler positively strengthens the fatigue life, increases the toughness, and increases the microwave healing indices (both fatigue and failure approaches). Finally, according to the study results, substituting 70% iron powder as the filler is the most suitable option for improving the mechanical and self-healing characteristics of asphalt mixes.</p>","PeriodicalId":21811,"journal":{"name":"Scientific Reports","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scientific Reports","FirstCategoryId":"103","ListUrlMain":"https://doi.org/10.1038/s41598-024-73290-2","RegionNum":2,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MULTIDISCIPLINARY SCIENCES","Score":null,"Total":0}
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Abstract
Through experimental tests, this paper investigated the effectiveness of microwave healing on asphalt mixtures containing iron powder (IP) filler to improve durability and enhance mechanical properties. The moisture sensitivity of the asphalt mixes with varying iron powder filler contents was measured using the modified Lottman test. For evaluating the asphalt mixture healing ability, two complementary methods were used: the fatigue-based method, derived from the ability of microwave healing of asphalt mixture samples damaged up to 50% level of indirect tensile fatigue (ITF), and the fracture-based method, obtained from the strength recovery rate of broken semi-circular samples by applying consecutive breaking-healing cycles. The results showed that the greater the quantity of iron powder filler in the asphalt sample, the greater the sample's indirect tensile strength and TSR ratio, indicating that IP had a positive effect on moisture sensitivity. The findings also indicated that utilizing iron powder as a filler positively strengthens the fatigue life, increases the toughness, and increases the microwave healing indices (both fatigue and failure approaches). Finally, according to the study results, substituting 70% iron powder as the filler is the most suitable option for improving the mechanical and self-healing characteristics of asphalt mixes.
本文通过实验测试，研究了微波加热对含有铁粉（IP）填料的沥青混合料提高耐久性和机械性能的效果。采用改良 Lottman 试验测量了不同铁粉填料含量的沥青混合料的湿度敏感性。在评估沥青混合料的愈合能力时，使用了两种互补方法：一种是基于疲劳的方法，该方法是根据沥青混合料样品的微波愈合能力（间接拉伸疲劳（ITF）达到 50%）得出的；另一种是基于断裂的方法，该方法是通过连续的断裂-愈合循环，根据断裂的半圆形样品的强度恢复率得出的。结果表明，沥青样品中铁粉填料的数量越多，样品的间接抗拉强度和 TSR 比率就越大，这表明 IP 对水分敏感性有积极影响。研究结果还表明，使用铁粉作为填料可提高疲劳寿命、韧性和微波愈合指数（疲劳和失效方法）。最后，根据研究结果，用 70% 的铁粉代替填料是改善沥青混合料机械和自愈特性的最合适选择。
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