天然岩沥青改善道路石油沥青机理研究

随着公路交通量的增加和对路面耐久性要求的提高，改性沥青在我国道路工程中应用越来越多，掺加天然岩沥青是改性方法之一。为了研究天然岩沥青改性普通沥青性能的内在机理和原因，以新疆岩沥青和滨州90号沥青作对比，采用元素分析、红外光谱、分子量、胶粒当量直径测试等技术手段分析了沥青的化学组成与结构。结果表明天然岩沥青中的沥青质和胶质含量高，硫、氮、氧等杂原子含量高，增加沥青质和胶质的极性，天然岩沥青与普通沥青混合后，分子极性大为增强，分子的缔合能力增强，沥青质分子相互吸引形成胶核，向外依次吸附胶质、芳香分和饱和分形成胶团结构，提高沥青的粘滞性、粘附力及沥青体系稳定性；羧基、羰基、醛等表面活性基团可改善沥青在集料表面的吸附，增加了沥青的抗水损坏性能。

Modification mechanism analysis of natural rock asphalt on road performance

With the increase of highway traffic volume and better durability for pavement, modified asphalt is applied more and more widely in pavement engineering. Natural asphalt can greatly improve the rutting-resistance and water sensibility of asphalt mixture, Chemical structure and composition of the Xinjiang natural asphalt and Binzhou No 90 asphalt was compared to indicate the modification mechanism of the natural asphalt. Analysis methods include SARA by liquid-solid chromatogram, IR spectra, elemental analysis, molecular weight, parameter of molecular structure and equivalent diameter of colloidal granule. Analysis results indicated that contend of sulfur, nitrogen and oxygen of natural asphalt is higher than that of Binzhou No 90 asphalt, which results the stronger polarity of asphaltenes and resins in natural asphalt. The aphaltenes is incline to link into big molecule.Equivalent diameter of asphaltenes colloidal granule in toluene was tested by method of viscosity rising ratio, which shows equivalent diameter of asphaltenes colloidal granule of Xinjiang natural asphalt in- creases more quickly as the concentration accretion.