Tourmaline改性沥青及其混合料热拌减排性能

Emission Reduction Effect of Tourmaline Modified Asphalt and Its Mixtures Under Condition of Hot-mix

为解决沥青混合料生产使用过程中的污染问题,选用Tourmaline对沥青进行改性。采用自组装气体收集设备,从沥青种类、加热时间、沥青用量和搅拌速率4个方面确定沥青烟测试的最佳试验方案;在此基础上,全面研究Tourmaline类型、掺量对沥青烟浓度的影响规律,并进一步对热拌减排机理及Tourmaline改性沥青混合料的路用性能进行研究;最后通过拌和楼及试验路排放检测,对比测试了普通改性沥青混合料与Tourmaline改性沥青混合料的沥青烟排放情况。结果表明:Tourmaline对沥青及其混合料的拌和具有显著的减排功效;Tourmaline改性沥青电性能良好,在受到压力或者温度作用下释放的电荷可以吸附沥青烟、粉尘等污染物;Tourmaline的添加能够显著改善沥青混合料的路用性能;拌和楼及试验路排放检测证明Tourmaline改性沥青混合料的热拌减排功效显著。

In order to solve the problem of serious pollution caused by preparation of asphalt mixture,tourmaline modified asphalt（TMA）was prepared.The waste gas and asphalt smoke were collected by self-assembled instrument and the most reasonable test method was determined by studying the effects of asphalt type,heating time,asphalt content and stirring rate.On that basis,the influence laws of the types and the mixing amount of tourmaline on asphalt smoke emission were systematically studied, and the emission reduction mechanism and road performance of tourmaline modified asphalt were also studied.The contrast test on emission of TMA mixture and commonly modified asphalt mixture was conducted with mix plant and test pavement emission detection.The results indicate that tourmaline can reduce the emission of asphalt smoke significantly.The tourmaline modified asphalt has excellent pyroelectricity,and it can release charges which can absorb smoke and dust under condition of being forced and heated,leading to an effect of emission reduction.The road performance of asphalt mixture can be improved significantly with the addition of tourmaline.It is verified that the emission reduction of tourmaline modified asphalt is quite obvious.