摘要
基于集料-沥青内聚力模型原理构建三种不同沥青混合料的内聚力模型,利用虚拟裂缝闭合技术赋予砂浆材料的扩展有限元属性,通过对模型施加一个位移荷载来分析不同级配界面和砂浆的抗裂性能分析。研究结果表明:不同级配的抗裂性受骨架结构、集料轮廓和形状指标的影响较大。当级配骨架结构不彻底,粗集料松散分布,存在较大砂浆区,往往会对界面造成严重损伤;当相同级配骨架时,粗集料指标对级配界面的抗裂性能成为主要因素;对比不同混合料级配下的SDEG曲和耗散能曲线可知,当分析能量等宏观指标对级配的性能参数影响作用时,由于未考虑到级配间细观参数的作用导致级配的抗裂性能并不明显,细观结构参数下级配砂浆和界面抗裂性能和变化规律均表现出较大的相异性。
The article is based on the principle of aggregate and asphalt cohesion model constructs a model of cohesion in three different asphalt mixture,using the virtual crack closure technique to extended finite element properties of slurry material,through a displacement loading of the model to analysis different gradation analysis interface and crack resistance of cement mortar. The results show that the anti-cracking resistance of the non-homogenicity is significantly affected by the skeleton structure,aggregate profile and shape index. When the structure of grade distribution skeleton is not complete,the coarse aggregate is loosely distributed,and there is a large slurry region,which can cause serious damage to the interface. When the same level of the skeleton,the coarse aggregate index is the main factor for the anti-crack performance of the graded interface. Contrast of SDEG curve under different mixture gradation and dissipation curve shows that when analyzing energy macroeconomic indicators such as impact on the performance parameters of grading,due to not considering the grading between the function of the mesoscopic parameters lead to the grading anti-crack performance is not obvious,the mesoscopic structure parameters with mortar and interface crack resistance at a lower level and change law showed significant differences.
出处
《公路工程》
北大核心
2018年第1期265-269,共5页
Highway Engineering
基金
河南省科技厅项目(162102210026)
关键词
沥青混合料
级配
内聚力模型
asphalt mixture
grading
internal force model
