| 摘要: |
| 为准确计算沥青混合料在SPT永久变形试验下的流动次数,分析了现有计算方法的不足之处,提出了基于Francken模型和应变曲线的局部拟合法,并提出了基于最小应变率的区间系数（K）最优值的确定方法.结果表明：直接实验值法的计算结果误差较大,移动平均值法的计算结果受步长的影响明显,函数拟合法的计算结果受拟合范围起始条件和终止条件的影响,其中终止条件的影响更为显著;随着K值的减小,应变率曲线的右侧逐渐向上移动而左侧向下移动,流动次数逐渐变小;当K<15时,2种混合料的应变率曲线和流动次数计算结果均保持不变,最优局部区间的K值为15. |
| 关键词: 沥青混合料 永久变形 应变曲线 流动次数 局部拟合法 流变次数 |
| DOI：103969/j.issn.1007 9629202104021 |
| 分类号: |
| 基金项目:战略性国际科技创新合作重点专项（2016YFE0202400） |
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| Calculation Method of Flow number of Asphalt Mixture |
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ZHANG Chao, TAN Yiqiu, HAN Meizhao, ZOU Jingjing
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School of Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
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| Abstract: |
| In order to accurately calculate the flow number of asphalt mixture under SPT permanent deformation test, the shortcomings of existing calculation methods were analyzed. A local fitting method based on Francken model was proposed, and the optimal interval coefficient was determined. The results show that the error of the direct experimental value method is large, while the moving average value method is obviously affected by the step size. The calculation results of flow number are affected by the starting and termination conditions of the strain fitting curve, and the effect of the termination condition is more significant. With the decrease of the interval coefficient K, the right side of the strain rate curve gradually moves up and the left side moves down, and the flow number gradually decreases. When K<15, the calculated results of strain rate curves and flow number of the two mixtures almost remain unchanged, and the interval coefficient K of the optimal local interval in this experiment is 15. |
| Key words: asphalt mixture permanent deformation strain curve flow number local fitting method flow point |
