【摘要】：瀝青路面溫縮裂縫問題長久以來都是路面主要病害之一,尤其是在低溫氣候地區(qū),由裂縫引發(fā)的麻面、坑槽、沉陷和翻漿等一系列問題嚴重影響道路使用功能及服務(wù)壽命。瀝青結(jié)合料作為瀝青路面主要組成部分,對路面低溫抗裂性能起到重要作用。本文借鑒增塑劑在塑料工業(yè)中的成功應(yīng)用,采用耐寒增塑劑雙(2-乙基己基)己二酸酯對瀝青進行改性,以期提高瀝青及瀝青混合料的低溫抗裂性能,并為瀝青改性材料的研究提供參考。本文以改善瀝青低溫性能為切入點,對中海70號基質(zhì)瀝青和4種不同添加量增塑劑改性瀝青及混合料進行了試驗,其中結(jié)合料試驗包括瀝青三大指標、布氏黏度試驗、BBR試驗,DSR試驗,紅外光譜試驗和短期老化試驗,混合料試驗包括凍融劈裂試驗、低溫彎曲試驗和高溫車轍試驗,研究不同添加量增塑劑對瀝青結(jié)合料及混合料路用性能的影響和規(guī)律。研究主要集中在以下幾方面:(1)不同添加量增塑劑改性瀝青流變特性、高低溫特性、抗老化特性研究;(2)基于紅外光譜技術(shù)的增塑劑改性瀝青改性機理探究;(3)不同添加量增塑劑改性瀝青混合料高低溫及抗水損害性能研究;(4)增塑劑/抗車轍劑復合改性瀝青混合料高低溫性能研究。通過一系列室內(nèi)試驗,得到以下結(jié)論:(1)動態(tài)剪切流變試驗結(jié)果表明,在10-2~102Hz范圍內(nèi),增塑劑改性瀝青中粘性成分增多,增塑劑添加量越大,瀝青中粘性成分比例越高;(2)增塑劑改性瀝青溫度敏感性提高,感溫特性隨增塑劑添加量的增大而降低;(3)低溫延度、當量脆點、玻璃化轉(zhuǎn)變溫度和蠕變速率m值等多指標綜合評價表明增塑劑對瀝青低溫抗裂特性改善效果明顯,增塑劑添加量提高,低溫抗裂特性增長明顯;(4)軟化點、60℃表觀黏度和抗車轍因子多指標綜合評價表明增塑劑不利于瀝青高溫穩(wěn)定性,且隨添加量的增大,高溫穩(wěn)定特性逐漸下降;(5)增塑劑對瀝青抗老化特性有一定改善,但改善效果不因增塑劑添加量的增大而提高;(6)基于紅外光譜分析,增塑劑改性瀝青中的增塑劑與瀝青主要是物理共混反應(yīng);(7)隨增塑劑添加量的增大,改性瀝青混合料低溫抗裂特性不斷提高,高溫穩(wěn)定特性逐漸降低;(8)增塑劑改性瀝青混合料抗水損害性能較未改性的有所提高,但抗水損害性能不因增塑劑添加量的增大而提高;(9)增塑劑/抗車轍劑復合改性瀝青混合料可以克服增塑劑對高溫抗車轍能力不足的影響,且同時兼顧低溫抗裂特性。
[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，

本文編號：2464232