复合型温拌沥青应用研究

Application Studies of Composite Warm Mix Asphalt

温拌沥青(简称WMA)技术具有节约能源,减轻环境污染的优点.但也存在一些缺点,其抗冰冻开裂性能,耐老化性能和粘附性能有待提高.本课题采用复合方法,在添加温拌剂的基础上添加一种高分子改性材料,复配出一种性能优越的新型温拌沥青.目的是有效地提高温拌沥青的抗低温性能,耐老化性能和粘附性能.试验结果显示,与传统的温拌沥青相比,复合型温拌沥青的5℃低温延度从0 cm增加到150 cm,可以更好地抗低温开裂;老化延度也从0 cm增加到21 cm,可以更好地抗老化,延长沥青使用寿命;可以紧紧地粘附在石料上面,具有良好的水稳定性和抗剥离性能.从高州山美试验路段的施工效果来看,复合型温拌沥青比改性沥青的施工温度要低40℃左右,沥青烟、苯可溶物、苯并芘等有害气体的排放量分别减少了91.0%、97.0%、48.3%,符合绿色、循环、低碳的发展理念,极大地降低了生产成本,保护大气环境,具有良好的路用性能.

The warm mix asphalt （WMA） technology has the advantages of saving energy and reducing environmental pollution. But there are some drawbacks; its anti freezing cracking resistance, aging resistance and adhesion property are to be improved. This paper adopts the composite method, and adding a kind of polymer modified materials on the basis of adding warm mix agents, can produce a new type of warm mix asphalt with superior performance. The aim is to improve the low temperature resistance, aging resistance and adhesion property of warm mix asphalt. Test results show that, the low temperature ductility at 5 ~C of the composite warm mix asphalt （CWMA） increased from 0cm to 150 cm, compared with the traditional warm mix asphalt, The CWMA can better resist low temperature cracking; due to its increased aging ductility （from 0cm to 21 cm） , the CWMA can better resist aging, and prolong the service life of asphalt; the CWMA can also tightly adhere to the stone above, and has good water stability and anti stripping performance. The effect of the test section of Gaozhou shows that the construction temperature of CWMA is about 40 degrees lower than that of modified asphalt, and the asphalt smoke emissions, benzene soluble organics, 91.0% ,97.0% ,48.3% , respectively. It conforms would save a lot resources, reduce the cost and performance. benzopyrene and other harmful gases were reduced to the green, and low carbon development idea; it the pollution of construction, andhave good road performance.