复合阻燃剂对花岗岩沥青混合料路用性能的影响

探究阻燃剂种类、掺量对SBS改性沥青性能的影响,并着重研究自制复合阻燃剂对以花岗岩为集料的AC-13C和SMA-13沥青混合料路用性能的影响。试验结果表明：复合阻燃剂具有阻燃、抑烟的双重作用,掺量为10%时,阻燃沥青的氧指数达到25.8%,阻燃效果较为明显;复合阻燃剂可以小幅提高以花岗岩为集料的AC-13C和SMA-13的车辙动稳定度,但降低了它们的残留稳定度比和冻融劈裂强度比,其中冻融劈裂强度比分别降低到70.1%和70.7%,降幅分别达到17.1%和16.7%。在冻害严重、地下水位偏高的隧道地段不宜采用此两种以花岗岩为集料的阻燃沥青混合料。

Effect of Compound Flame Retardant on Pavement Performance of Asphalt Mixtures with an Aggregate of Granite

The influence of types and addition of flame retardants on properties of SBS modified asphalt was investigated.Effects of the homemade compound flame retardant on pavement performances of asphalt mixtures（AC-13C and SMA-13） with an aggregate of granite were studied.The test results show that compound flame retardant act as not only a good flame retardant,but also a good smoke inhibitor.When the dosage of flame retardant is 10%,the oxygen index of SBS modified asphalt increases to 25.8%.The dynamic stability of asphalt mixtures（AC-13C and SMA-13） with an aggregate of granite was slightly improved by compound flame retardant,while the retained stability ratio and freeze-thaw split strength ratio were reduced remarkably.It was noticeable that the freeze-thaw split strength ratio of the two types of flame-retarded asphalt mixtures decreased to 70.1% and 70.7,about 17.1% and 16.7% downcompared with asphalt mixtures where the flame retardants were not added.In the tunnel environment of high groundwater level and serious freeze injury,these two types of flame-retarded asphalt mixtures with an aggregate of granite are not recommended.