不同添加剂对沥青抑烟效果影响的试验研究

Experimental research on the influence of different additives on asphalt smoke suppression

为解决沥青路面摊铺会产生大量烟气这一问题,在LT70;基质沥青中添加烟气抑制剂制备抑烟沥青,对其抑烟效果进行分析。首先通过自制沥青烟气收集装置对初选的4种不同掺量抑烟剂进行产烟量测试,优选出抑烟剂纳米CaCO_(3)和SBS(热塑性聚苯乙烯-聚丁二烯-聚苯乙烯嵌段共聚物);将其复配后对沥青进行改性并进行产烟量测试;最后采用热重分析仪和差示扫描量热仪对抑烟沥青的抑烟效果进行评价。结果表明,在最佳复配比例下的“Sasobit+纳米CaCO_(3)”组合和“Sasobit+SBS”组合,能使沥青烟气的产生量分别减少11.71%和15.8%,失重率分别降低11.38%和25.24%,吸热量分别减少16.73%和28.53%,热稳定性提高。

To reduce the emission of toxic gases generated during the construction of asphalt pavement,this paper added smoke suppressant into 70;base asphalt,to prepare smoke suppressant asphalt and analyze the performance of smoke suppressant asphalt.First,according to different smoke suppression mechanisms,four recognized smoke suppressants were selected,the smoke suppression effects of the four smoke suppressants were evaluated through a self-made asphalt smoke collection device,and smoke suppressants with improved smoke suppression effects were selected.Nano-CaCO_(3)and SBS.Then the smoke suppressant was compounded with the warm mixing agent,and the smoke production test was carried out on the modified asphalt after compounding the smoke suppressant by the gravimetric method.Finally,the thermogravimetric analyzer and the differential scanning calorimeter were used to control the suppression.The test results showed that:the single blending of smoke suppressant and warm mixing agent can reduce the smoke production of asphalt,and the smoke suppressing effect of smoke suppressant CaCO_(3)and SBS is better than Sasobit;the smoke production of mixed asphalt is further reduced,indicating the smoke suppressant CaCO_(3)and SBS and the warm mixing agent Sasobit have a synergistic effect on the smoke suppression effect of asphalt.The combination of Sasobit+nano-CaCO_(3)and Sasobit+SBS at the optimal compound ratio obtained by the gravimetric method reduces the smoke production rate of asphalt respectively.11.71%and 15.8%;through the TG test,the thermal decomposition temperature of the compound asphalt moved to the high-temperature direction.The weight loss rate of the Sasobit+nano-CaCO_(3)combination and the Sasobit+SBS combination was reduced by 11.38%and 25.24%,which greatly improved the thermal stability of the asphalt performance.The area of the heat absorption peak of the compound asphalt obtained through the DSC test was obviously reduced during the heating process,and the heat absorption was significantly reduced,making the combination of Sasobit+nano CaCO_(3)and Sasobit+SBS combination smoke suppression the heat absorption of asphalt has been reduced by 16.73%and 28.53%respectively.The temperature stability was significantly improved,and the amount of smoke produced under the same high-temperature conditions was reduced.