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摘要: 利用X-rayCT无损检测设备分别对Marshall与SGC成型的AC-16、SMA-16与OGFC-16三种沥青混合料的内部结构进行扫描, 利用数字图像处理技术, 分析了混合料内部的空隙分布特征。分析结果表明: 沥青混合料内部空隙呈不均匀分布状态, 其变异性受成型方式与级配型式的影响。在试件的高度方向, SGC成型试件的内部空隙总体上呈现“两头大、中间小”的特性, 但Marshall成型试件的空隙分布特征并不显著。在试件的横向, AC-16与SMA-16试件的空隙较多地分布在试件边缘, 试件呈“外疏内密”状态。Abstract: X-ray computed tomography(CT) technology was adopted to scan the internal structures of AC-16, SMA-16 and OGFC-16 mixture specimens compacted using Marshall and Superpave gyratory compactor(SGC) methods. Digital image processing technology was adopted to analyze the spatial distribution of their internal air voids. The result shows that the distributions of air voids are not uniform in mixture specimens, and they vary greatly with the compacting styles and gradations of asphalt mixtures. Throughout the specimen height, air void percents are bigger on the top and at the bottom, and are smaller in the middles of the specimens compacted by SGC method, whereas the distribution variances are not marked for the specimens compacted by Marshall method. Throughout the cross sections of the specimens, air voids distribute more in the outside parts than in the middle parts for AC-16 and SMA-16 mixtures. 3 tAbs, 11 figs, 10 refs.
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Key words:
- pavement engineering /
- asphalt mixture /
- internal air void /
- spatial distribution /
- CT
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图 2 Marshall成型AC-16试件的CT图片
Figure 2. CT images of AC-16 specimen compacted by Marshall
图 4 Marshall成型SMA-16试件的CT图片
Figure 4. CT images of SMA-16 specimen compacted by Marshall
图 6 Marshall成型OGFC-16试件的CT图片
Figure 6. CT images of OGFC-16 specimen compacted by Marshall
图 8 SGC试件内部空隙分布
Figure 8. Air void distributions of mixture specimens compacted by SGC
图 9 Marshall试件内部空隙分布
Figure 9. Air void distributions of mixture specimens compacted by Marshall
表 2 Performance parameters of asphalt mixtures
Table 2. Performance parameters of asphalt mixtures
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