Mechanical properties of reinforced asphalt concretes with different position grids
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摘要: 为了分析格栅层位对加筋沥青混凝土力学性能影响的内在规律, 分别制作不同层位格栅加筋的沥青混凝土轮碾成型试件和马歇尔成型试件, 进行了混凝土层间剪切与层间拉拔试验, 同时研究了格栅层位对加筋沥青混凝土强度性能的影响, 并引入无量纲的韧性指数对劈裂强度试验进行评价。结果表明: 设格栅的沥青混凝土试件的力学性能都优于不设格栅的试件; 在25℃和60℃的不同层位格栅加筋的沥青混凝土的层间抗剪能力相似; 当格栅设于混凝土试件中间时, 加筋沥青混凝土层间粘结能力最好, 其抗压强度、抗压回弹模量及韧性最大; 当格栅远离混凝土中间时, 加筋混凝土的劈裂强度最大。Abstract: In order to study the internal law of mechanical properties for reinforced asphalt concretes with different position grids, wheel rolling specimens and Marshall formation samples were respectively made. Interlayer shear and pull-out tests were conducted. The influence of grid position on concrete strength property was studied. Dimensionless toughness index was introduced to evaluate splitting strength test. Analysis result shows that the mechanical property of asphalt concrete reinforced with grid is better than that without grid. The interlayer resisting shear abilities of reinforced asphalt concretes with different position grids are similar at 25 ℃ and 60 ℃. When grid is set in the middle of concrete sample, the interlayer caking capability of reinforced concrete is best, its compression strength, compression resilience modulus and toughness are maximum. When grid is far away from the middle, the splitting strength of reinforced concrete is maximum.
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Key words:
- pavement material /
- asphalt concrete /
- mechanical property /
- grid position
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图 2 格栅在剪切、拉拔、无侧限抗压试件中位置
Figure 2. Grid positions in shear, pull-out and non-confining compression strength specimens
表 1 AC-16沥青混合料级配
Table 1. Gradation of AC-16 asphalt mixture
筛孔尺寸/mm 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 通过率/% 95.0 84.0 70.0 48.0 34.0 24.5 17.5 12.5 9.5 6.0 
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表 2 玻纤格栅技术指标
Table 2. Technical criterions of glass-fiber grid
规格 网眼尺寸/mm 断裂强度/ (kN·m-1) 伸长率/% 弹性模量/MPa 幅宽/m 耐温性/℃ 耐腐蚀性 单位面积质量/ (g·m-2) 经向 纬向 经向 纬向 EGA2×2B 9.5 9.5 ≥100 ≥44 ≤4 67 000 1.5~2.0 -100~280 优良 560
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表 3 拉拔试验结果
Table 3. Results of pull-out test
夹层位置 粘结强度/MPa 平均粘结强度/MPa 试件1 试件2 试件3 Ⅰ 0.326 6 0.348 2 0.274 6 0.316 5 Ⅱ 0.383 9 0.462 5 0.424 0 0.423 5 Ⅲ 0.181 0 0.243 1 0.235 1 0.219 7
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表 4 抗压试验结果
Table 4. Results of compression test
MPa 试验温度/℃ 抗压指标 格栅层位 Ⅰ Ⅱ Ⅲ Ⅳ 15 抗压回弹模量 1 943 2 256 2 064 1 792 抗压强度 5.142 3 5.364 8 4.661 8 4.194 6 20 抗压回弹模量 1 789 2 043 1 806 1 687 抗压强度 4.203 8 5.043 3 3.710 8 3.626 3
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表 5 劈裂试验结果
Table 5. Results of splitting test
格栅层位 均值 标准差 劈裂强度/MPa 拉伸应变/10-3 劲度模量/MPa 劈裂强度 拉伸应变 劲度模量 i 1.958 9 2.152 1 704 0.152 0.038 160.03 ii 1.855 1 2.196 1 580 0.174 0.019 155.96 iii 1.951 0 2.251 1 620 0.175 0.050 131.92 iv 1.725 8 2.306 1 401 0.052 0.140 42.76
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