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摘要: 通过UTM试验系统对纯沥青混合料(BN)、复合1#聚酯玻纤布沥青混合料(BT)与复合2#聚酯玻纤布沥青混合料(BU)进行了应变控制疲劳性能试验, 建立了应变与疲劳寿命的疲劳方程和累计疲劳能耗与应变的回归方程, 引入能量方法对疲劳试验结果进行了分析。结果发现聚酯玻纤布复合沥青混合料疲劳性能优于纯沥青混合料疲劳性能, 累计能耗与疲劳寿命相关, 聚酯玻纤布能够提高沥青混合料的疲劳性能, 能量法是研究和评价沥青混合料疲劳性能的有效方法。Abstract: The fatigue properties of neat asphalt mixture(BN), asphalt mixture with 1# fiberglass polyester mat(BT) and asphalt mixture with 2# fiberglass polyester mat(BU) were analysed by universal testing machine(UTM), the fatigue life equation expressed strain and the equation between cumulative dissipated energy and cycles were established, the testing result was studied by energy method.It is found that the properties of BT and BU are better than BN, the cumulative dissipated energy has good relation with fatigue life.Energy method is feasible for evaluating and predicting the fatigue properties of asphalt mixtures, fiberglass polyester mat can greatly improve the fatigue performances of asphalt mixtures.
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Key words:
- road engineering /
- asphalt mixture /
- fiberglass polyester mat /
- energy method /
- fatigue property
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表 1 沥青的试验指标与技术要求
Table 1. Test indices and technical properties of asphalt
试验指标 25 ℃针入度/0.1mm 针入度指数 15 ℃延度/cm 软化点/℃ 闪点/℃ 含蜡量/% 25 ℃密度/(g·cm-3) 溶解度/% 埃索AH-70# 63 -0.91 > 150 48.5 290 1.95 1.043 99.6 技术要求 60~80 — > 100 44.0~54.0 230 ≤3.00 实测 ≥99.0 表 2 AC-20Ⅰ沥青混合料的级配
Table 2. Aggregate gradation of AC-20Ⅰ asphalt mixture
AC-20Ⅰ 通过下列方孔筛(mm)的质量百分率/% 26.500 19.000 16.000 13.200 9.500 4.750 2.360 1.180 0.600 0.300 0.150 0.075 级配下限 100 90.00 78.00 63.00 48.00 30.00 22.00 15.00 11.00 6.00 4.00 3.00 级配上限 100 100.00 94.00 83.00 68.00 50.00 38.00 29.00 21.00 16.00 10.00 7.00 试验级配 100 96.50 87.90 74.90 56.10 40.80 29.80 22.20 15.50 10.20 7.58 5.04 表 3 马歇尔试验结果
Table 3. Result of Marshall test
试验指标 最佳油石比/% 空隙率/% 矿料间隙率/% 残留稳定度/% 冻融劈裂试验强度比/% 动稳定度/(次·mm-1) 试验结果 4.2 3.9 13.5 85.7 81.6 1 585 技术要求 — 3.0~6.0 ≥13.0 ≥75.0 ≥70.0 ≥800 表 4 UTM疲劳试验结果
Table 4. Fatigue test result on UTM
编号 混合料材料类型 应变水平/με 疲劳寿命Nf/次 1 2 3 4 平均值 变异系数% BN AC-20Ⅰ 200 311 930 324 970 331 950 — 322 950 3.14 400 15 940 26 810 20 080 23 610 21 610 21.60 600 3 830 3 780 4 460 3 010 3 770 15.75 BT AC-20Ⅰ+1# 200 766 800 662 400 516 100 520 300 616 400 32.02 400 22 660 38 330 40 090 28 740 38 720 23.00 600 5 760 5 330 8 500 — 6 530 26.33 BU AC-20Ⅰ+2# 200 652 290 539 110 723 000 — 638 130 22.40 400 40 530 36 110 51 100 30 020 39 440 22.50 600 4 450 6 470 7 170 8 420 6 630 25.10 表 5 疲劳试验累计能耗结果
Table 5. Cumulative dissipated energy result of fatigue test
编号 混合料材料类型 应变水平/με 累计能耗WFAT/104 Pa 1 2 3 4 平均值 变异系数% BN AC-20Ⅰ 200 2 460.32 2 505.41 2 552.26 — 2 506.00 1.83 400 559.17 764.40 618.87 671.87 653.58 13.32 600 263.35 273.83 299.57 217.09 263.46 13.08 BT AC-20Ⅰ+1# 200 5 101.09 4 693.47 3 579.10 3 763.50 4 284.29 17.06 400 975.77 1 049.60 1 127.98 796.90 987.56 14.32 600 375.50 358.97 527.72 — 420.73 22.11 BU AC-20Ⅰ+2# 200 4 171.20 3 919.69 5 276.27 — 4 455.72 16.20 400 1 187.59 1 091.60 1 389.32 920.36 1 147.22 17.05 600 299.46 433.38 463.95 549.40 436.55 23.80 -
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