基质沥青中低温粘弹性能的研究
发布时间：2018-12-29 10:49
【摘要】：沥青路面凭借其优良的平整性、快速的修补性能以及低廉的养护成本等优势在众多的路面类型中脱颖而出。众多学者在研究沥青混合料路用性能方面做了许多卓有成效的工作,而对于组成沥青混合料最基本的沥青材料性能却少有突破。沥青材料是感温性材料,具有明显的粘弹性性质,极易受温度、行驶速度等外界因素的影响。近年来,对于沥青路面的高温稳定性研究较多,硕果累累,而对于其中低温性能的研究却少之又少,而最关键的是基质沥青的中低温路用性能反映指标的研究。基于材料的粘弹性理论,对其弹性、粘性、粘弹性等不同状态下的基本力学性质进行了综述。从开裂机理、影响因素、试验方法、评价指标等方面对沥青的中低温开裂做了研究,基于镇海70#基质沥青,设计了试验方案,并运用相关分析软件,对其粘弹性参数进行了研究,分析了参数敏感性,在已有指标的基础上提出了合适的指标来评价基质沥青中低温性能。为了模拟沥青路面的实际工作环境,采用流变仪对沥青试样进行了动态剪切试验,取降温速率为1°/min,频率扫描为1Hz-20Hz,温度扫描为-10℃～50℃,得到了沥青试件在降温速率为1°/min下,不同温度和不同频率条件下的系列粘弹性参数。运用Origin分析软件,对其粘弹性参数的敏感性进行了研究,得到如下结论:温度分别为-10℃、-5°℃、0℃、5℃、10℃、30℃、40℃、50℃ 时,频率在1Hz-20Hz变化下,通过对Han曲线的分析,得出该沥青为非均相体,对沥青粘度、储能模量、损失模量、车辙因子等模量进行拟合,推出车辙因子在O℃～10℃范围内表现较为敏感;在降温速率为1 °/min,频率分别为5Hz、10Hz、15Hz时,温度在-10℃～50℃变化下,通过粘度敏感性分析,得出频率在15Hz时,粘度值较为敏感,结合粘度对路用性能的影响,分析得到粘度-车辙因子在中低温区间较为敏感。通过回归分析,得到各参数对数下随温度变化规律,频率在15Hz时,当温度为-10℃～10℃,推荐使用lg(G*/sinδ)的变化率来评价沥青的低温性能,在温度为10℃～50℃时,比较已有指标,采用G*(sinδ)9作为中温参考指标。
[Abstract]:Asphalt pavement stands out among many pavement types by virtue of its excellent smoothness, fast repair performance and low maintenance cost. Many scholars have done a lot of fruitful research on the performance of asphalt mixture, but few breakthroughs have been made on the performance of asphalt mixture. Bitumen is a temperature-sensitive material with obvious viscoelastic properties, which is easily affected by external factors such as temperature, driving speed and so on. In recent years, there have been many and fruitful researches on the high temperature stability of asphalt pavement, but the research on the low temperature performance of the asphalt pavement is rare, and the key is the research on the performance index of the medium and low temperature asphalt. Based on the viscoelastic theory of materials, the basic mechanical properties of materials in different states such as elasticity and viscoelasticity are reviewed. The cracking mechanism, influencing factors, test methods and evaluation indexes of asphalt were studied in this paper. Based on Zhenhai 70# base asphalt, the test scheme was designed, and the related analysis software was used. The viscoelastic parameters were studied, and the sensitivity of the parameters was analyzed. On the basis of the existing indexes, a suitable index was proposed to evaluate the medium and low temperature performance of the matrix asphalt. In order to simulate the actual working environment of asphalt pavement, the dynamic shear test of asphalt sample was carried out by rheometer. The temperature reduction rate was 1 掳/ min, frequency scan was 1Hz-20Hz, and the temperature scan was -10 鈩，
本文编号：2394742
[Abstract]:Asphalt pavement stands out among many pavement types by virtue of its excellent smoothness, fast repair performance and low maintenance cost. Many scholars have done a lot of fruitful research on the performance of asphalt mixture, but few breakthroughs have been made on the performance of asphalt mixture. Bitumen is a temperature-sensitive material with obvious viscoelastic properties, which is easily affected by external factors such as temperature, driving speed and so on. In recent years, there have been many and fruitful researches on the high temperature stability of asphalt pavement, but the research on the low temperature performance of the asphalt pavement is rare, and the key is the research on the performance index of the medium and low temperature asphalt. Based on the viscoelastic theory of materials, the basic mechanical properties of materials in different states such as elasticity and viscoelasticity are reviewed. The cracking mechanism, influencing factors, test methods and evaluation indexes of asphalt were studied in this paper. Based on Zhenhai 70# base asphalt, the test scheme was designed, and the related analysis software was used. The viscoelastic parameters were studied, and the sensitivity of the parameters was analyzed. On the basis of the existing indexes, a suitable index was proposed to evaluate the medium and low temperature performance of the matrix asphalt. In order to simulate the actual working environment of asphalt pavement, the dynamic shear test of asphalt sample was carried out by rheometer. The temperature reduction rate was 1 掳/ min, frequency scan was 1Hz-20Hz, and the temperature scan was -10 鈩，
本文编号：2394742
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