再生沥青混合料的黏弹性动态响应及疲劳性能

发布时间：2019-04-09 17:36

【摘要】：为了分析废旧沥青路面材料(RAP)对热拌沥青混合料的黏弹性动态响应及疲劳性能的影响,设计了不同RAP掺量(10%、20%、30%)及不同级配(AC-13和AC-16)的沥青混合料,采用沥青混合料性能试验仪(AMPT)在不同温度和加载频率下的动态模量,之后采用时间-温度等效原理,确定了不同沥青混合料的动态模量主曲线;并对不同沥青混合料进行了单轴拉伸疲劳试验,通过简化的黏弹性连续损伤模型(S-VECD),确定了不同级配、不同RAP含量的沥青混合料的损伤特征曲线(C-S),及基于能量的疲劳失效标准与疲劳加载次数之间的关系(GR-Nf).结果表明:沥青混合料的动态模量随着温度的升高、加载频率的降低而降低,温度越低、频率越高,沥青混合料越接近弹性体,反之越接近黏性体;从不同级配的沥青混合料的动态模量主曲线中可以看出,RAP含量越高,其动态模量越高,但总体来看相差不大.疲劳试验及分析表明:RAP含量较高时,其疲劳性能较低,表明其应力松弛能力较差,因此应更加关注再生沥青混合料的抗疲劳性能.
[Abstract]:In order to analyze the influence of waste asphalt pavement material (RAP) on viscoelastic dynamic response and fatigue performance of hot mix asphalt mixture, different RAP content (10%, 20%) was designed. For asphalt mixtures with 30% and different grades (AC-13 and AC-16), the dynamic modulus of asphalt mixture performance tester (AMPT) at different temperatures and loading frequencies is adopted, and then the principle of time-temperature equivalence is adopted. The main curves of dynamic modulus of different asphalt mixtures are determined. The uniaxial tensile fatigue tests of different asphalt mixtures were carried out. Through the simplified viscoelastic continuous damage model (S-VECD), the damage characteristic curves (C _ s) of asphalt mixtures with different gradation and different RAP content were determined, and the damage characteristic curves of asphalt mixtures with different grades and different RAP contents were determined by the simplified Visco-elastic continuous damage model (VCM). And the relationship between fatigue failure criteria based on energy and fatigue loading times (GR-Nf). The results show that the dynamic modulus of asphalt mixture decreases with the increase of temperature and the loading frequency decreases. The lower the temperature is, the higher the frequency is, the closer the asphalt mixture is to the elastomer, and the more close the asphalt mixture is to the viscous body. From the main curve of dynamic modulus of asphalt mixture with different gradation, it can be seen that the higher the content of RAP is, the higher the dynamic modulus of asphalt mixture is, but there is little difference on the whole. Fatigue test and analysis show that when the content of RAP is high, its fatigue performance is lower, which indicates that its stress relaxation ability is poor. Therefore, more attention should be paid to the fatigue resistance of recycled asphalt mixture.
【作者单位】：长安大学特殊地区公路工程教育部重点实验室;陕西省交通建设集团公司安平高速公路管理处;
【基金】：中央高校基本科研业务费专项资金资助项目(CHD2011ZD010) 安康市科技局资助项目(2015 AK04-02)
【分类号】：U414

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