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摘要: 为了评价Sasobit的降温效果及其对沥青混合料路用性能的影响, 对掺加中温沥青改性剂Sasobit后的沥青胶结料进行了针入度及软化点试验, 对未掺加Sasobit的正常温度拌和成型的沥青混合料试件与添加Sasobit后降低拌和成型温度制作的沥青混合料试件进行了空隙率试验、车辙试验、小梁弯曲试验及冻融劈裂试验, 分析了沥青与沥青混合料的性能。分析结果表明, 掺加Sasobit后, 沥青胶结料的高温稳定性得到提高, 降低拌和成型温度制作的沥青混合料试件的空隙率、低温抗裂性及水稳定性与未掺加Sasobit的正常温度拌和的沥青混合料试件相比基本保持不变, 同时沥青混合料高温稳定性提高较大, 因此, 通过添加Sasobit降低混合料的拌和及成型温度是可行的。
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关键词:
- 路面工程 /
- 沥青混合料 /
- Sasobit添加剂 /
- 性能试验
Abstract: In order to evaluate the temperature-lowered effect of Sasobit and its influence on the road performances of asphalt mixture, penetration test and softening point test for asphalt with Sasobit were done, void ratio test, rutting test, bending-beam test and frost thawing and splitting test were done to asphalt mixture samples without Sasobit mixed in normal temperature and with Sasobit mixed in low temperature, and their performances were analyzed. Test result indicates that the high temperature stability of asphalt with Sasobit increases, the changes of the void ratio, crack resistance stability in low temperature and water stability of mixtures with Sasobit are unobvious, but its high temperature stability enhances, it is feasible that the mixing and molding temperatures of asphalt mixture are lowered by using Sasobit.-
Key words:
- pavement engineering /
- asphalt mixture /
- Sasobit additive /
- performance test
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图 1 针入度及针入度指数随Sasobit掺量的变化曲线
Figure 1. Change curves of penetration and penetration index with Sasobit contents
表 1 物理指标
Table 1. Physical indices
指标 典型值 厂方指标 凝固点/℃ 100 ≥99 闪点/℃ 约290 — 粘度(135℃)/(10-3 Pa·s) 12 10~12 针入度(25℃)/0.1 mm < 1 ≤1 密度(25℃)/(g·cm-3) 0.94 — 
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表 2 软化点随Sasobit掺量的变化
Table 2. Change of softening point with different Sasobit contents
Sasobit掺量/% 5 4 3 2 1 0 软化点/℃ > 80.0 62.5 52.6 49.6 48.4
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表 3 玄武岩指标
Table 3. Basalt indices
指标 试验值 规范要求 表观相对密度 2.90 ≥2.60 石料压碎值/% 10.5 ≤26.0 洛杉矶磨耗损失/% 13.5 ≤28.0 针片状含量/% 6.5 ≤15.0 吸水率/% 1.0 ≤2.0
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表 4 矿粉指标
Table 4. Mineral powder indices
指标 试验值 规范要求 表观密度/(t·m-3) 2.83 ≥2.50 含水量/% 0.5 ≤1.0 粒度范围/% < 0.600 mm 100.0 100.0 < 0.150 mm 99.1 90.0~100.0 < 0.075 mm 98.0 70.0~100.0 外观 无团粒结块 无团粒结块 亲水系数 0.50 < 1.00 塑性指数/% 2 < 4 加热安定性 不变质 实测记录
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表 5 沥青混合料级配
Table 5. Asphalt mixture gradation
% 级配类型 通过下列筛孔(mm)的质量百分率 16.000 13.200 9.500 4.750 2.360 1.180 0.600 0.300 0.150 0.075 AC-13 100.00 90.00~100.00 65.00~85.00 38.00~68.00 24.00~50.00 15.00~38.00 10.00~28.00 7.00~20.00 5.00~15.00 4.00~8.00 设计值 100.00 96.33 70.13 42.11 29.58 21.05 16.36 11.16 8.14 6.42
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表 6 拌和及成型温度
Table 6. Mixing and molding temperatures
℃ 温度 普通沥青混合料 添加Sasobit的沥青混合料 集料温度 175 155 沥青温度 160 160 成型温度 145 125
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表 7 车辙试验结果
Table 7. Rutting test result
试验项目 基质沥青混合料 添加Sasobit的沥青混合料 动稳定度/(次·min-1) 1 280 4 150 变形量/mm 18.5 2.5
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表 8 弯曲破坏试验结果
Table 8. Result of bending damage test
类型 抗弯拉强度/MPa 最大弯拉应变 弯曲应变能/(10-3N·m) 基质沥青混合料 7.84 0.001 034 109 添加Sasobit后的沥青混合料 7.94 0.001 120 126
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表 9 冻融劈裂试验结果
Table 9. Result of frost thawing and splitting test
% 试验项目 基质沥青混合料 添加Sasobit后的沥青混合料 劈裂强度比 80.5 81.0
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