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Moisture stability improvement of asphalt mixture considering the surface characteristics of steel slag coarse aggregate

机译：考虑到钢渣粗骨料表面特性的沥青混合料的水分稳定性改进

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Weathering treatment is a necessary operation to ensure the volume stability of steel slag coarse aggregate (SSCA) in service. Some previous research proved that the surface of weathered SSCA can significantly affect the moisture resistance of steel slag based asphalt mixture. In this research, the surface characteristics of weathered SSCA and its effect process on the moisture stability of asphalt mixture were first determined. Then two corresponding measures, strengthening the surface of weathered SSCA by an improved organic modification method and enhancing the bonding performance between SSCA and asphalt mastic by adjusting the composition of asphalt mastic, were taken to improve the moisture stability of weathered SSCA based asphalt mixture. Results suggested that weathered SSCA was sensitive to freeze-thaw cycle damage, and the fracture of calcium carbonate product layer coating the surface of weathered SSCA should be responsible for it. The proposed two measures both play a positive role in raising the freeze-thaw cycle damage resistance of weathered SSCA based asphalt mixture. Considering the asphalt pavement may be faced to serious freeze-thaw damage environment in service, weathered SSCA or organic modified weathered SSCA was suggested to prepare asphalt mixture with SBS modified asphalt and some Portland cement. The recommended dosage of Portland cement was 50% of the total filler volume after considering the technology solutions commonly adopted in the actual construction of asphalt pavement in China. (C) 2020 Elsevier Ltd. All rights reserved.
机译：耐候性是一种必要的操作，以确保钢渣粗骨料（SSCA）在使用中的体积稳定性。一些以前的研究证明，风化SSCA的表面可以显着影响钢渣基沥青混合物的耐湿性。在本研究中，首先确定风化SSCA的表面特征及其对沥青混合物的水分稳定性的效果过程。然后采用改进的有机改性方法强化了两种相应的措施，通过改进的有机改性方法加强风化SSCA的表面，通过调节沥青乳香的组成来提高SSCA和沥青胶粘剂之间的粘合性能，以提高受风化SSCA的沥青混合物的湿度稳定性。结果表明，风化的SSCA对冻融循环损伤敏感，碳酸钙产物层涂层的骨折应负责它。提出的两项措施既在提高受风化的SSCA沥青混合料的冻融循环损伤时也发挥了积极作用。考虑到沥青路面可能面对服务中的严重冻融损伤环境，建议风化的SSCA或有机改性风化SSCA制备沥青混合物与SBS改性沥青和一些波特兰水泥。在考虑到中国沥青路面实际建设中常用的技术解决方案，Portland水泥的推荐剂量为总填充体积的50％。 （c）2020 elestvier有限公司保留所有权利。

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