Faculty of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
J Hazard Mater. 2011 Oct 30;194:209-15. doi: 10.1016/j.jhazmat.2011.07.086. Epub 2011 Aug 5.
Authors consider the environmental prospects of using melted waste slag as the aggregate for asphalt pavement. In particular, the enrichment of slag-derived fragments in fine abrasion dust particles originated from slag asphalt concrete and its size dependency were concerned. A series of surface abrasion tests for asphalt concrete specimens, containing only natural aggregates as reference or 30 wt% of substituted slag aggregates, were performed. Although two of three slag-asphalt concretes generated 1.5-3.0 times larger amount of abrasion dust than the reference asphalt concrete did, it could not be explained only by abrasion resistance of slag. The enrichment of slag-derived fragments in abrasion dust, estimated on the basis of the peak intensity of quartz and heavy metal concentrations, had size dependency for all slag-asphalt concretes. Slag-derived fragments were enriched in abrasion dust particles with diameters of 150-1000 μm. Enrichment factors were 1.4-2.1. In contrast, there was no enrichment in abrasion dust particles with diameter less than 75 μm. This suggests that prior airborne-size fragmentation of substituted slag aggregates does not need to be considered for tested slag aggregates when environmental risks of abrasion dust of slag-asphalt pavement are assessed.
作者认为利用熔融废矿渣作为沥青路面集料具有环境前景。特别是，作者关注了源自矿渣沥青混凝土的矿渣衍生碎片在细磨损粉尘颗粒中的富集及其尺寸依赖性。对含有天然集料作为参照或替代 30wt%矿渣集料的矿渣沥青混凝土试件进行了一系列表面磨损试验。尽管三种矿渣沥青混凝土中的两种产生的磨损粉尘量比参照沥青混凝土多 1.5-3.0 倍，但这不能仅用矿渣的耐磨性来解释。根据石英和重金属浓度的峰值强度估算，磨损粉尘中矿渣衍生碎片的富集与所有矿渣沥青混凝土都具有尺寸依赖性。矿渣衍生碎片在直径为 150-1000μm 的磨损粉尘颗粒中富集。富集因子为 1.4-2.1。相比之下，直径小于 75μm 的磨损粉尘颗粒中没有富集。这表明，在评估矿渣沥青路面磨损粉尘的环境风险时，无需考虑测试矿渣集料中替代矿渣集料的空气传播粒径破碎。
