为了解决汽车尾气造成的污染问题,采用掺填式和涂覆式制备沥青混合料试件,探讨在沥青混合料中掺杂或涂覆电气石-二氧化钛(TATi)复合材料对碳氢化合物、一氧化碳和氮氧化物这3种尾气降解效率及耐久性的影响,并对尾气降解型沥青混合料的路用性能进行评价。结果表明:制备掺填式沥青混合料选用质量分数50%的TATi复合材料替代矿粉经济实惠;选用质量分数3%的TATi溶液喷涂(刷涂)制备的涂覆式沥青混合料尾气降解效率较高;与掺填式和涂覆式沥青混合料相比,TATi掺杂量为3%(质量分数)的含砂雾封层涂覆式沥青混合料的尾气降解效率和耐久性最好;碾压后掺填式和涂覆式沥青混合料的尾气降解效率均有所降低,与掺填式沥青混合料相比,涂覆式沥青混合料尾气降解效率明显降低;掺杂TATi后掺填式和涂覆式沥青混合料均能满足路用性能。
To address pollution issues associated with automobile exhaust,asphalt mixture specimens were prepared utilizing filling and coating methods.This study investigated the effects of incorporating or coating tourmaline-titanium dioxide (TATi) composite materials into asphalt mixtures on the degradation efficiency and durability of hydrocarbons,carbon monoxide,and nitrogen oxides.Additionally,the road performance of these exhaust-degrading asphalt mixtures was evaluated.The results indicated that employing TATi composite material with a mass fraction of 50% as a substitute for mineral powder in the formulation of blended asphalt mixtures was economically feasible.Furthermore,the exhaust degradation efficiency of coated asphalt mixtures,prepared by spraying (brushing) a TATi solution with a mass fraction of 3%,was superior.Among the various mixtures,the sand mist seal coated asphalt mixture with a TATi doping content of 3% (by mass) exhibited the highest efficiency in exhaust degradation and durability.It was observed that the exhaust degradation efficiency of both mixed and coated asphalt mixtures decreased after rolling.Notably,the coated asphalt mixture exhibited a significant reduction in exhaust gas degradation efficiency compared to the mixed asphalt mixture.However,after doping with TATi,both filled and coated asphalt mixtures could meet the required road performance standards.
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基金资助
国家自然科学基金(51508150);河北省自然科学基金(E2022402050)
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