| 摘要: |
| 为研究250μm(60目)胶粉、混合目胶粉及表面活性剂型温拌剂的掺入对沥青混合料疲劳性能的影响，进行了小梁四点弯曲疲劳试验，同时结合能耗理论对试验数据进行分析，得到耗散能相对变化率（RDEC），并以此作为评价标准对沥青混合料的疲劳损伤3阶段进行了验证.结果表明：不论是何种改性剂或是否掺入温拌剂，沥青混合料达到疲劳破坏时的累积耗散能Wf与疲劳寿命Nf在双对数坐标下均呈良好的线性关系，且此线性关系不受试验条件影响；文中4种沥青混合料均呈现出Wf随应变水平增加而减小的规律，且各沥青混合料随着应变水平的增加，其Nf之差、Wf之差不断减小；用2种胶粉改性剂制得的沥青混合料中，混合目胶粉改性沥青混合料的疲劳性能更优；同种沥青混合料掺入温拌剂后，其疲劳性能均得以提高；RDEC指标验证了现行规范中将50%初始劲度模量所对应的加载次数作为沥青混合料的疲劳寿命时，仅经历了疲劳破坏的前2个阶段，并未完全发挥出沥青混合料的路用性能. |
| 关键词: 温拌剂 胶粉改性剂 四点弯曲疲劳试验 能耗理论 疲劳性能 |
| DOI：103969/j.issn.1007 9629201803024 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（11462018）；内蒙古交通科技项目(NJ 2015 1)；内蒙古自治区自然科学基金资助项目（2017MS（LH）0102）；内蒙古自治区研究生科研创新项目（B20161012803Z） |
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| Fatigue Properties of Warm Mix Crumb Rubber Modified Asphalt Mixture |
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WANG Lan, WANG Liqiang, FENG Lei, ZHANG Fei
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School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
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| Abstract: |
| In order to study the influence of the addition of 250μm（60mesh）, mixed mesh crumb rubber with surfactant warm mix reagent added on the fatigue properties of asphalt mixtures, the four point bending fatigue test of the small beam was conducted. Then the test data was analyzed with energy dissipation theory; An index named relative dissipated energy change ratio(RDEC) was inferred out, then 3stages of fatigue damage for asphalt mixtures with RDEC as evaluation criterion. The study results indicate that no matter which modifier is added and how the weather is and whether or not the warm mix reagent is added, a fine linear relationship in double logarithm coordinates between the cumulative dissipated energy Wf and fatigue life Nf for asphalt mixtures is shown as the fatigue break occurs; Furthermore, the linear relationship wouldnt be influenced by the changes of experimental conditions; Four types of material meet the regulation of Wf that reduces with strain level increases, gaps between Wf and gaps between Nf gradually reduce of each materials with the increase of strain level; As far as the asphalt mixtures made from two crumb rubber modifiers were concerned, the mixed mesh numbers is better; For the same mixture, the fatigue properties are improved significantly after warm mix reagent is added; The RDEC confirms that the current specification makes a load number that corresponds to 50% initial bending stiffness modulus as the fatigue life of asphalt mixtures, and makes the asphalt mixtures only experience 2stages of fatigue break, the asphalt mixtures is not fully performed. |
| Key words: warm mix reagent crumb rubber modifier four point bending fatigue experiment energy dissipated theory fatigue property |
