Fractal evaluation of surface texture for coarse aggregate and performance test of asphalt mixture
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摘要: 采用激光轮廓仪测量了7种不同粗集料的表面纹理曲线, 应用结构函数法分析了粗集料表面纹理的分形特性, 采用特征粗糙度综合表征了粗集料表面纹理的粗糙度、形状和坡度特性, 并考察了特征粗糙度对沥青混合料性能的影响。分析结果表明: 粗集料表面纹理在一定范围内具有分形特性, 其特征粗糙度与沥青混合料动稳定度和冻融劈裂强度比具有显著的线性相关性; 随粗集料表面纹理特征粗糙度的增加, 沥青混合料高温抗变形能力、抗水损害能力和低温抗裂性能逐渐增强。Abstract: Seven kinds of surface textures for coarse aggregates were measured directly by using laser profilometer.The fractal traits of surface textures were analyzed by using structure function method.The roughness, shape and gradient of each surface texture were synthetically evaluated by using characteristic roughness.Finally, the influence of characteristic roughness on the performance of asphalt mixture was inspected.Analysis result indicates that the surface texture of coarse aggregate behaves fractal trait in a definite scope.Characteristic roughness has remarkable linear correlation with the ratio of the dynamic stability to the freeze-thaw tensile strength for asphalt mixture.Its high-temperature rutting resistance, resistance to water damage and low-temperature anti-cracking performance could be improved with the increase of characteristic roughness.
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图 4 特征粗糙度与动稳定度关系
Figure 4. Correlation between characteristic roughness and dynamic stability
图 5 特征粗糙度与劈裂强度比关系
Figure 5. Correlation between characteristic roughness and tensile strength ratio
图 6 特征粗糙度与抗拉强度关系
Figure 6. Correlation between characteristic roughness and tensile strength
图 7 特征粗糙度与抗拉应变关系
Figure 7. Correlation between characteristic roughness and tensile strain
表 1 粗集料表面纹理特性描述
Table 1. Description of surface texture characteristics for coarse aggregates
编号 A B C D E F G 纹理描述 非常粗糙 非常粗糙 比较粗糙 比较粗糙 非常光滑 光滑 光滑 种类 白色花岗岩 红色花岗岩 玄武岩 玄武岩 变质玄武岩 安山岩 石灰岩 产地 河北 河北 吉林 河北 黑龙江 吉林 吉林 
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表 2 分形评定结果
Table 2. Fractal evaluation results
粗集料 A B C D E F G D 1.266 1.167 1.209 1.176 1.233 1.181 1.230 K/mm 1.598 2.039 0.726 0.591 0.102 0.354 0.319
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表 3 特征粗糙度
Table 3. Characteristic roughnesses
集料 A B C D E F G r*/mm 1.376 1.534 0.817 0.727 0.226 0.531 0.476
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表 4 AC-16C矿质集料级配
Table 4. Mineral aggregate gradation of AC-16C
筛孔尺寸/mm 19 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 通过百分率/% 100.0 95.0 80.0 60.0 40.0 29.5 22.0 17.5 13.0 9.5 6.0
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