增塑剂DOA改性沥青及混合料高低温性能研究
发布时间：2019-04-24 07:13
【摘要】：沥青路面温缩裂缝问题长久以来都是路面主要病害之一,尤其是在低温气候地区,由裂缝引发的麻面、坑槽、沉陷和翻浆等一系列问题严重影响道路使用功能及服务寿命。沥青结合料作为沥青路面主要组成部分,对路面低温抗裂性能起到重要作用。本文借鉴增塑剂在塑料工业中的成功应用,采用耐寒增塑剂双(2-乙基己基)己二酸酯对沥青进行改性,以期提高沥青及沥青混合料的低温抗裂性能,并为沥青改性材料的研究提供参考。本文以改善沥青低温性能为切入点,对中海70号基质沥青和4种不同添加量增塑剂改性沥青及混合料进行了试验,其中结合料试验包括沥青三大指标、布氏黏度试验、BBR试验,DSR试验,红外光谱试验和短期老化试验,混合料试验包括冻融劈裂试验、低温弯曲试验和高温车辙试验,研究不同添加量增塑剂对沥青结合料及混合料路用性能的影响和规律。研究主要集中在以下几方面:(1)不同添加量增塑剂改性沥青流变特性、高低温特性、抗老化特性研究;(2)基于红外光谱技术的增塑剂改性沥青改性机理探究;(3)不同添加量增塑剂改性沥青混合料高低温及抗水损害性能研究;(4)增塑剂/抗车辙剂复合改性沥青混合料高低温性能研究。通过一系列室内试验,得到以下结论:(1)动态剪切流变试验结果表明,在10-2~102Hz范围内,增塑剂改性沥青中粘性成分增多,增塑剂添加量越大,沥青中粘性成分比例越高;(2)增塑剂改性沥青温度敏感性提高,感温特性随增塑剂添加量的增大而降低;(3)低温延度、当量脆点、玻璃化转变温度和蠕变速率m值等多指标综合评价表明增塑剂对沥青低温抗裂特性改善效果明显,增塑剂添加量提高,低温抗裂特性增长明显;(4)软化点、60℃表观黏度和抗车辙因子多指标综合评价表明增塑剂不利于沥青高温稳定性,且随添加量的增大,高温稳定特性逐渐下降;(5)增塑剂对沥青抗老化特性有一定改善,但改善效果不因增塑剂添加量的增大而提高;(6)基于红外光谱分析,增塑剂改性沥青中的增塑剂与沥青主要是物理共混反应;(7)随增塑剂添加量的增大,改性沥青混合料低温抗裂特性不断提高,高温稳定特性逐渐降低;(8)增塑剂改性沥青混合料抗水损害性能较未改性的有所提高,但抗水损害性能不因增塑剂添加量的增大而提高;(9)增塑剂/抗车辙剂复合改性沥青混合料可以克服增塑剂对高温抗车辙能力不足的影响,且同时兼顾低温抗裂特性。
[Abstract]:The problem of bituminous pavement temperature shrinkage crack has been one of the main pavement diseases for a long time, especially in low temperature climate area, a series of problems caused by cracks, such as hemp surface, pit, subsidence and grouting, seriously affect the road service function and service life. As the main component of asphalt pavement, asphalt binder plays an important role in low temperature crack resistance of pavement. Based on the successful application of plasticizer in plastic industry, the bitumen was modified by cold-resistant plasticizer bis (2-ethylhexyl) adipate in order to improve the anti-cracking performance of asphalt and asphalt mixture at low temperature. It also provides a reference for the study of asphalt modified materials. In order to improve the low temperature performance of asphalt, the experiment of Zhonghai No. 70 base asphalt and four kinds of plasticizer modified asphalt and mixture was carried out. The binder test included three indexes of asphalt, Brinell viscosity test, BBR test, and so on. DSR test, infrared spectrum test and short-term aging test, mixture test including freeze-thaw splitting test, low-temperature bending test and high-temperature rut test were used to study the influence and regularity of different amount of plasticizer on pavement performance of asphalt binder and mixture. The research focuses on the following aspects: (1) the rheological properties, high and low temperature characteristics and anti-aging characteristics of asphalt modified by plasticizer with different additions; (2) the mechanism of modification of asphalt modified by plasticizer based on infrared spectroscopy; (3) study on high and low temperature and anti-water damage performance of asphalt mixture modified with different amount of plasticizer; (4) study on high and low temperature performance of asphalt mixture modified by plasticizer / anti-frog agent. Through a series of laboratory tests, the following conclusions are drawn: (1) the results of dynamic shear rheological test show that in the range of 10-2~102Hz, the viscous component in asphalt modified by plasticizer increases, and the larger the amount of plasticizer, the higher the proportion of viscous component in asphalt; (2) the temperature sensitivity of asphalt modified by plasticizer was increased, and the temperature sensitivity of asphalt was decreased with the increase of plasticizer content. (3) the comprehensive evaluation of low temperature ductility, equivalent embrittlement point, glass transition temperature and creep rate m value shows that plasticizer has obvious effect on improving bitumen cracking resistance at low temperature, the addition of plasticizer is increased, and the anti-cracking property at low temperature is obviously increased. (4) the comprehensive evaluation of softening point, apparent viscosity at 60 鈩，
本文编号：2464232
[Abstract]:The problem of bituminous pavement temperature shrinkage crack has been one of the main pavement diseases for a long time, especially in low temperature climate area, a series of problems caused by cracks, such as hemp surface, pit, subsidence and grouting, seriously affect the road service function and service life. As the main component of asphalt pavement, asphalt binder plays an important role in low temperature crack resistance of pavement. Based on the successful application of plasticizer in plastic industry, the bitumen was modified by cold-resistant plasticizer bis (2-ethylhexyl) adipate in order to improve the anti-cracking performance of asphalt and asphalt mixture at low temperature. It also provides a reference for the study of asphalt modified materials. In order to improve the low temperature performance of asphalt, the experiment of Zhonghai No. 70 base asphalt and four kinds of plasticizer modified asphalt and mixture was carried out. The binder test included three indexes of asphalt, Brinell viscosity test, BBR test, and so on. DSR test, infrared spectrum test and short-term aging test, mixture test including freeze-thaw splitting test, low-temperature bending test and high-temperature rut test were used to study the influence and regularity of different amount of plasticizer on pavement performance of asphalt binder and mixture. The research focuses on the following aspects: (1) the rheological properties, high and low temperature characteristics and anti-aging characteristics of asphalt modified by plasticizer with different additions; (2) the mechanism of modification of asphalt modified by plasticizer based on infrared spectroscopy; (3) study on high and low temperature and anti-water damage performance of asphalt mixture modified with different amount of plasticizer; (4) study on high and low temperature performance of asphalt mixture modified by plasticizer / anti-frog agent. Through a series of laboratory tests, the following conclusions are drawn: (1) the results of dynamic shear rheological test show that in the range of 10-2~102Hz, the viscous component in asphalt modified by plasticizer increases, and the larger the amount of plasticizer, the higher the proportion of viscous component in asphalt; (2) the temperature sensitivity of asphalt modified by plasticizer was increased, and the temperature sensitivity of asphalt was decreased with the increase of plasticizer content. (3) the comprehensive evaluation of low temperature ductility, equivalent embrittlement point, glass transition temperature and creep rate m value shows that plasticizer has obvious effect on improving bitumen cracking resistance at low temperature, the addition of plasticizer is increased, and the anti-cracking property at low temperature is obviously increased. (4) the comprehensive evaluation of softening point, apparent viscosity at 60 鈩，
本文编号：2464232
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