Triaxial shear test on anti-shear properties of asphalt mixture
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摘要: 借助三轴剪切试验研究了沥青混合料的抗剪性能, 采用简单性能试验考察了剪切疲劳作用的影响以及抗剪强度参数与车辙之间的相关性。研究发现: 级配类型、沥青用量、沥青性质及试验温度对混合料抗剪强度有显著影响, 抗剪强度随着荷载作用次数的增加呈幂函数递减, 抗剪强度参数与抗车辙性能之间呈良好的对数关系。结果表明剪切疲劳产生的流动变形是车辙产生的主要原因。Abstract: The anti-shear properties of asphalt mixtures were studied through triaxial shear test.The influence of shear fatigue on shear strength was analyzed by using triaxial repeated load test.The relationship between anti-shear strength index and rutting index was observed.Analysis result shows that such factors as gradation type, asphalt content, asphalt properties and test temperature have great influence on the anti-shear strength of asphalt mixture.Anti-shear strength decreases exponentially with the increase of repeated loading numbers.The relativity between anti-shear strength index and rutting index shows good logarithmic function.The main reason of rutting formation is flow deformation resulted from shear fatigue.
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Key words:
- pavement material /
- asphalt mixture /
- triaxial shear test /
- anti-shear strength
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图 7 抗剪强度参数与车辙深度相关性
Figure 7. Relativity between anti-shear strength indexes and rutting depth
表 1 沥青性质
Table 1. Properties of asphalts
试验项目 AH-70 SBS 高粘度改性沥青 针入度(25 ℃, 0.1mm) 65.5 58.5 37.8 针入度指数 0.51 1.32 1.11 延度(15 ℃)/cm 93.5 100.5 81.7 软化点(环球法)/℃ 53.1 65.7 92.5 当量软化点T800/℃ 54.2 56.7 63.6 动力粘度(60 ℃)/(Pa·s) 206.4 2 017.1 76 635.6 密度/(g·cm-3) 1.005 0.993 1.036 弹性恢复(25 ℃)/% 8.0 91.3 96.8 TFOT后残留物(163 ℃, 5 h) 质量损失/% -0.133 0.055 0.014 软化点(环球法)/ ℃ 55.8 65.9 87.3 延度(5 ℃)/cm 4.3 24.1 29.0 动力粘度(60 ℃)/(Pa·s) 262.8 2 462.8 15 768.7 
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表 2 混合料级配
Table 2. Gradations of asphalt mixtures
类型 通过下列筛孔(方孔筛, mm)的质量百分率/% 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 SMA13 100.0 93.4 62.2 24.8 21.4 18.1 15.3 13.2 12.0 11.2 AC13 100.0 96.0 76.8 50.7 34.4 25.2 18.3 13.5 10.6 9.2 Sup13 100.0 97.1 78.8 53.0 32.4 19.9 15.3 9.4 7.2 5.5 PA13 100.0 91.9 54.2 17.7 14.7 11.9 9.4 7.7 6.7 6.1
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表 3 混合料设计指标
Table 3. Design indexes of mixtures
类型 SMA13 AC13 Sup13 PA13 油石比/% 6.00 5.60 5.00 5.15 空隙率/% 4 4 4 20
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表 4 不同类型混合料试验结果
Table 4. Test results of different mixtures
抗剪参数 AC13 Sup13 SMA13 PA13 粘聚力c/kPa 207.52 212.90 197.68 51.71 内摩擦角φ/(°) 33.30 37.52 39.47 29.71
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表 5 SMA13粗细级配
Table 5. Coarse and fine gradations of SMA13
级配 通过下列筛孔(方孔筛, mm)的质量百分率/% 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 粗级配 100.0 93.4 62.2 24.8 21.4 18.1 15.3 13.2 12.0 11.2 细级配 100.0 96.0 69.7 31.0 23.5 17.6 15.3 12.3 11.2 9.8
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表 6 不同粗细混合料试验结果
Table 6. Test results of coarse and fine gradation mixtures
类型 c/kPa φ/(°) SMA13粗级配 197.68 39.47 SMA13细级配 204.38 38.58
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表 7 相关性等级
Table 7. Relativity grades
标准 相关性系数R2 Se/Sy 极好 ≥0.90 ≤0.35 良好 0.70~0.89 0.36~0.55 一般 0.40~0.69 0.56~0.75 较差 0.20~0.39 0.76~0.89 很差 ≤0.19 ≥0.90
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