AC-25粒度分布对级配离析的影响

发布时间：2018-07-10 12:02

本文选题：路面材料 + AC-　；参考：《交通运输工程学报》2014年05期

【摘要】：在AC-25级配范围内,通过调整拌合楼各热料仓比例生产出7种级配的沥青混合料,采用贝雷法将AC-25级配组成划分为0~0.3、0.3~1.18、1.18~4.75、4.75~13.2、13.2~31.5mm5个区间,运用灰色关联法计算了不同级配的各区间集料含量与级配离析的灰色关联度。分析结果表明:灰色关联度可以较好地反映AC-25级配区间集料含量对级配离析的影响程度,5个区间4.75~13.2、0.3~1.18、0~0.3、1.18~4.75、13.2~31.5mm的关联度依次减小;4.75~13.2mm区间集料含量与级配离析的灰色关联度最大,该区间集料含量的变化对最终路面级配变异会产生较大影响,设计时可通过调整该种集料含量以获得较好的抗离析级配;1.18~4.75mm和13.2~31.5mm粒径区间的集料含量与级配离析的灰色关联度偏小,说明粗集料和细集料中的较粗部分对级配离析的影响较小;各级配区间集料含量与级配变异程度的二次回归相关系数大于0.6,说明集料间交互作用对最终离析程度影响较大,仅考虑单个筛孔通过率对沥青混合料性能的影响,有可能会消弱集料级配的离析特征,应从不同粒级组合角度分析沥青混合料级配的抗离析性能。
[Abstract]:Within the AC-25 gradation range, seven kinds of graded asphalt mixtures were produced by adjusting the ratio of each hot silo in the mixing plant. The AC-25 grade composition was divided into 0 0. 3 / 0. 3 / 0. 3 / 1. 18 / 1. 18 / 4.75 / 4.75 / 13.2 / 13.2 / 31.5mm / 5 by Bayley method. The grey correlation degree between aggregate content and gradation segregation of different gradation is calculated by using grey correlation method. The results show that the grey correlation degree can well reflect the influence of aggregate content in AC-25 grading interval on gradation segregation, and the grey correlation degree between the aggregate content of 4.75 ~ 13.2mm interval and the gradation segregation is the largest, and the correlation degree between the aggregate content and the gradation segregation is the largest, and the correlation degree between the aggregate content and the gradation segregation is the largest, and the correlation degree between the aggregate content and the gradation segregation is the largest, and the correlation degree between the aggregate content and the gradation segregation is the largest, and the correlation degree between the aggregate content and the gradation segregation is the largest. The change of aggregate content in this section will have a great influence on the final pavement gradation variation. In the design, the aggregate content can be adjusted to obtain a better anti-segregation gradation 1.18 ~ 4.75mm and the gray correlation degree between the aggregate content and the gradation segregation is small, which indicates that the coarse part of coarse aggregate and fine aggregate has little effect on gradation segregation. The quadratic regression correlation coefficient between aggregate content and gradation variation is greater than 0.6, which indicates that the interaction between aggregate and aggregate has a great influence on the final segregation degree, only considering the influence of the passing rate of single sieve hole on the performance of asphalt mixture. It is possible to weaken the segregation characteristics of aggregate gradation, so the anti-segregation performance of asphalt mixture gradation should be analyzed from the point of view of different grain-grade combinations.
【作者单位】：长安大学特殊地区公路工程教育部重点实验室;
【基金】：交通运输部科技项目(2011 319 812 410) 陕西省自然科学基础研究计划项目(2010JM7005)
【分类号】：U414

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