复合阻燃温拌沥青混合料制备与性能研究

Study on Preparation and Performance of a Composite Flame Retardant Warm Mix Asphalt Mixture

为提高温拌沥青混合料水稳定性能,文中利用有机硅改性层状双金属氢氧化物LDHs、石墨烯和温拌剂Sasobit与AH-90重交石油沥青均匀混合得到阻燃温拌改性沥青,并进一步制备出路用性能良好的AC-13型沥青混合料,通过黏温曲线、高温车辙试验、低温三点弯曲试验、浸水残留稳定度试验、冻融劈裂试验及燃烧试验对其施工可行性、高、低温性能、水稳性能、燃烧性能进行研究。结果表明,添加阻燃温拌剂的沥青混合料的残留稳定度增加了11.56%,冻融劈裂强度比增加了12.52%;无论拌和温度还是压实温度,温拌阻燃沥青比基质沥青要下降10℃左右。添加阻燃温拌剂的沥青混合料在上述各项性能上均优于传统基质沥青混合料。

In order to improve the water stability of existing warm mix asphalt mixture, the flame retardant warm mix modified asphalt was obtained by uniformly mixing organosilicon modified layered bimetallic hydroxide LDHs, graphene and warm mix agent Sasobit with AH-90 heavy cross petroleum asphalt. The asphalt mixture of AC-13 gradation with good road performance was further prepared. Through viscosity temperature curve, high temperature rutting test, low temperature three-point bending test, immersion residual stability test, freeze-thaw splitting test and combustion test, the construction feasibility, high and low temperature performance, water stability and combustion performance were studied. The research shows that the residual stability of asphalt mixture added with flame retardant warm mix agent increased by 11.56% and the freeze-thaw splitting strength ratio increased by 12.52%. Both the mixing temperature and compaction temperature of the warm mix flame retardant asphalt are about 10 ℃ lower than that of the base asphalt. The asphalt mixture with flame retardant warm mix agent is better than the traditional matrix asphalt mixture in the above properties, which verifies the possibility of its application in pavement engineering.