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首页> 外文期刊>Journal of materials in civil engineering >Effects of Aggregate Shape on Performance of Gravel-Aggregate Hot-Mix Asphalt Using Digital Image-Based Approach
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Effects of Aggregate Shape on Performance of Gravel-Aggregate Hot-Mix Asphalt Using Digital Image-Based Approach

机译：基于数字图像的骨料形状对碎石骨料热拌沥青性能的影响

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摘要

The present study investigated the application potential of crushed gravel (CG) aggregates in asphalt mixes. Three different types of aggregates; i.e., gravel (G), crushed gravel (CG), and crushed stone (CS); were used for shape characterization and mix performance evaluations. The CG aggregates were produced by crushing G aggregates using a single-stage jaw crusher. The aggregates of six different sizes; i.e., P19-R12.5 (passing through 19 mm and retaining on 12.5 mm), P12.5-R9.5, P9.5-R4.75, P4.75-R2.36, P2.36-R1.18, and P1.18-R0.600; were considered in this study. The aggregate was subjected to shape characterization using a digital image-based aggregate image measurement system (AIMS). The cumulative shape index (CSI) for each aggregate shape parameter was determined for three control (i.e., 100% G, 100% CG, and 100% CS) and three mix blends (i.e., 25% CG + 75% CS, 50% CG + 50% CS, and 75% CG + 25% CS). The performance of the asphalt mixes under shear, compression, and moisture damage was evaluated using an aggregate slip test (AST), stability (S), and moisture damage potential tests, respectively. Additionally, the correlations between mix performance and CSIs were drawn. The results showed that the crushing of G aggregates significantly improves the angularity, texture, and form2D, but decreases the sphericity. The CG aggregate angularity increases with the decrease in aggregate size. The gradation with 100% G had the least cumulative angularity index (CAI) and cumulative texture index (CTI) followed by the 100% CG and the 100% CS gradations. However, in the cases of cumulative sphericity index (CSpI) and cumulative form2D index (CF2DI), varying trends were observed. The performance tests revealed that all but the 100% G mix combinations satisfied the stability and moisture resistance criteria of asphalt mixes. Also, mixes with 100% CG aggregates offered a relatively higher rutting resistance than the 100% G aggregates. The CAI, CTI, and CSpI exhibited positive correlation with stability and rutting resistance, whereas the CF2DI showed negative correlation. Further, the AST test more effectively captured the effects of aggregate shape than stability. The study concluded that even 100% CG aggregates can be used in asphalt mixes without any detrimental effects on performance.
机译：本研究调查了碎石（CG）骨料在沥青混合料中的应用潜力。三种不同类型的聚集体；即砾石（G），碎石（CG）和碎石（CS）;用于形状表征和混合性能评估。通过使用单级颚式破碎机将G骨料破碎来生产CG骨料。六种不同大小的集合；即，P19-R12.5（穿过19毫米并保持在12.5毫米上），P12.5-R9.5，P9.5-R4.75，P4.75-R2.36，P2.36-R1.18 ，以及P1.18-R0.600;在这项研究中被考虑。使用基于数字图像的聚合图像测量系统（AIMS）对聚合体进行形状表征。确定了三个对照组（即100％G，100％CG和100％CS）和三种混合共混物（即25％CG + 75％CS，50％）的每个集合体形状参数的累积形状指数（CSI） CG + 50％CS，以及75％CG + 25％CS）。分别使用骨料滑移试验（AST），稳定性（S）和潜在湿气破坏性测试评估了沥青混合料在剪切，压缩和湿气破坏下的性能。此外，绘制了混合性能和CSI之间的相关性。结果表明，G骨料的破碎显着改善了棱角，织构和form2D，但降低了球形度。 CG聚合角度随聚合尺寸的减小而增加。 G值为100％的渐变具有最小的累积角度指数（CAI）和累积纹理指数（CTI），其次是100％CG和100％CS渐变。但是，在累积球度指数（CSpI）和累积form2D指数（CF2DI）的情况下，观察到了变化的趋势。性能测试表明，除100％G混合物以外的所有混合物均满足沥青混合物的稳定性和耐湿性标准。同样，与100％CG骨料混合的混合物比100％G骨料具有相对更高的抗车辙性。 CAI，CTI和CSpI与稳定性和抗车辙性呈正相关，而CF2DI与负性呈正相关。此外，AST测试比稳定性更有效地捕获了聚集体形状的影响。研究得出的结论是，即使100％CG骨料也可以用于沥青混合料中，而不会对性能造成任何不利影响。

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