煤直接液化残渣对道路沥青改性作用的初步评价

现代交通具有轴载重、通量大和轮胎内压高的特点，因此，对公路路面提出了更高的要求。沥青是路面材料的重要组分之一，起黏结剂的作用，但由于沥青自身的温度敏感性，直接来自原油的道路沥青或重交通道路沥青自身不能满足要求。随着四季自然条件的变化，沥青变软或变硬，以致老化变脆，使路面发生损坏如车辙、开裂、剥离等。为了改善道路沥青路面的使用性能，使用改性沥青是解决这一问题的重要方法。改性沥青是在常规道路沥青中添加改性剂后的均匀沥青混合物。目前，大部分的高速公路的铺设均使用改性沥青。

Preliminary study on direct coal liquefaction residue as paving asphalt modifier

Based on the specifications of ASTM D5710 95 and BSI BS 3690 for Trinidad Lake Asphalt (TLA) modified asphalt, two residues （CLA1 and CLA2）from direct coal liquefaction (DCL) were evaluated for using as high grade paving asphalt modifier. TLA was used as comparison. The results show that CLA1 and CLA2 modified asphalt with 7% of CLA1 or CLA2 addition has similar modification ability as 20% TLA modified asphalt. The modified asphalts meet the specifications for 40~55 or 50 penetration grade. The penetration ratio of CLA2 modified asphalt after TFOT is significantly higher, which indicates its supreme ability to against the temperature aging. Preliminary study implies that DCL residues may be a suitable alternative additive for producing TLA type modified asphalt. Furthermore it was also found that with increasing amount of CLA1 or CLA2 addition the softening point of the modified asphalts increase and the penetration value and the ductility decrease.