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Application of marble dust and ground granulated blast-furnace slag in emulsified asphalt warm mixtures
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2022-08-12 , DOI: 10.1016/j.jclepro.2022.133532
Shiva Kumar Mahto , Sanjeev Sinha

Warm mix asphalt (WMA) has the advantage of lower production temperature as compared to conventional hot mix asphalt (HMA). It is prepared by using various types of technologies which change the properties of bitumen binder attributes to ease in workability of the mixes. In the present study, bitumen emulsion was used for preparing WMA mixes by pre-coating the aggregates. Moreover, the conventional filler used in such mixes was replaced with industrial wastes to further reap environmental benefits. Marble dust (MD) and ground granulated blast-furnace slag (GGBS) are generated abundantly and disposal is a big issue. These were used in varying contents (i.e. from 2% to 8% by the weight of mix) and WMA properties were evaluated for strength and durability. Marshall properties and indirect tensile strength test (ITS) were carried out for strength evaluation. The tensile strength ratio (TSR) was conducted as per AASHTO T 283 for durability analysis. The wheel tracker test was performed for rutting analysis. Cantabro loss was determined to assess the cohesion resistance of the asphalt mixtures. Scanning electron microscopy (SEM) images were used to assess the microscopic characteristics of WMA and its constituents. The results revealed that the inclusion of both MD and GGBS as fillers into WMA had significantly improved the stability, tensile strength, TSR, rutting and Cantabro loss results as compared to the control mix. However, the addition of GGBS filler in emulsified warm mixes showed better resistance to moisture too. Lower rut depth was observed using GGBS as compared to marble dust filler. The statistical analysis reported that there was a significant difference between stability and TSR values whereas for adhesion loss it showed insignificant difference between the GGBS and MD based mixes.



中文翻译:

大理石粉尘和磨碎粒状高炉渣在乳化沥青温拌物中的应用

与传统的热拌沥青 (HMA) 相比,温拌沥青(WMA) 具有生产温度较低的优点。它是通过使用各种类型的技术制备的,这些技术改变了沥青粘合剂属性的性质,以简化混合物的可加工性。在本研究中,沥青乳液用于通过预涂骨料制备 WMA 混合物。此外,这种混合物中使用的传统填料被工业废物取代,以进一步获得环境效益。大量产生大理石粉尘(MD)和磨碎的粒状高炉渣(GGBS),处置是一个大问题。它们以不同的含量使用(即按混合物重量计从 2% 到 8%),并评估 WMA 性能的强度和耐久性。进行马歇尔性能和间接拉伸强度测试(ITS)进行强度评估​​。抗拉强度比 (TSR) 根据 AASHTO T 283 进行耐久性分析。车轮跟踪器测试用于车辙分析。测定 Cantabro 损失以评估沥青混合物的抗内聚性。扫描电子显微镜 (SEM) 图像用于评估 WMA 及其成分的微观特征。结果表明,与对照混合物相比,将 MD 和 GGBS 作为填料加入 WMA 显着改善了稳定性、拉伸强度、TSR、车辙和 Cantabro 损失结果。然而,在乳化温混合物中添加 GGBS 填料也显示出更好的耐湿性。与大理石粉尘填料相比,使用 GGBS 观察到较低的车辙深度。统计分析表明稳定性和 TSR 值之间存在显着差异,而对于粘附损失,它显示 GGBS 和基于 MD 的混合物之间的差异不显着

更新日期:2022-08-15
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