有机硅/SBS复合改性沥青技术性能研究

Research on the Technical Properties of Silicone/SBS Modified Asphalt

为了研究有机硅/SBS复合改性沥青技术性能,通过变化有机硅/SBS比例掺量,以AH-70沥青进行复合改性,采用针入度、软化点、延度、储存稳定性、RTFOT老化、光氧模拟老化及BBR试验,综合评定复合改性沥青高温、低温及抗老化性能。结果表明:开发的有机硅/SBS复合改性沥青在有机硅掺量为2.5%、SBS掺量为3.5%时,满足改性沥青技术指标要求;RTFOT及紫外光模拟老化后,270 min老化前后针入度比为85%、延度比为79.5%、软化点比为106%,分别较SBS改性沥青提高了29%、54.5%、32%,抗老化性能明显增强;在BBR试验加载240 min时,低温抗裂性能评价指标J(t)值为0.0058,较SBS改性沥青提高了71%,提高了低温抗裂性。可见,研发的有机硅/SBS复合改性沥青较SBS改性沥青具有更优良的抗老化性能、储存稳定性及低温抗裂性能。

In order to study the technical properties of silicone/SBS composite surrogate asphalt,the high temperature,low temperature and anti-aging properties of composite modified asphalt are comprehensively evaluated by changing the proportion of silicone/SBS and adding AH-70 asphalt to composite surname.The Penetration,softening point,ductility,storage stability,RTFOT aging,photo oxygen simulated aging and BBR test are used to comprehensively evaluate the properties of composite modified asphalt.The results show that the developed organic silicon/SBS composite modified asphalt can meet the technical requirements of modified asphalt when the organosilicon content is 2.5%and SBS content is 3.5%;after RTFOT and UV simulated aging,the penetration ratio before and after 270min aging is 85%,the ductility ratio is 79.5%,and the softening point ratio is 106%.Compared with SBS modified asphalt,the penetration ratio is increased by 29%,54.5%,and 32%respectively,and the anti-aging performance is significantly enhanced.The evaluation index value of low temperature crack resistance J(t)is 0.0058 when the load is 240min in the BBR test,which is 71%higher than that of SBS modified asphalt and the low temperature crack resistance being improved.It is concluded that the organosilicon/SBS composite modified asphalt has better performance in terms of aging resistance,storage stability and low temperature crack resistance than SBS modified asphalt.