多聚磷酸复配Terminal blend胶粉改性沥青流变特性及其混合料路用性能

发布时间：2018-01-14 22:35

本文关键词：多聚磷酸复配Terminal blend胶粉改性沥青流变特性及其混合料路用性能　出处：《公路工程》2017年02期 　论文类型：期刊论文

【摘要】：基于针入度评价体系和PG分级体系研究了多聚磷酸(PPA)与Terminal Blending胶粉复合沥青性能,优化了最佳的PPA与TB胶粉掺量范围,采用车辙、低温弯曲、浸水马歇尔、冻融劈裂试验和四分点加载疲劳试验研究了PPA与TB胶粉复合改性沥青混合料的路用性能、抗疲劳性能和自愈合性能,并将其与4.5%SBS改性沥青混合料进行了对比。结果表明,TB胶粉改性沥青低温性能和抗疲劳性能优良,但其高温性能较差,将TB胶粉与PPA复配后可实现二者对沥青混合料高低温性能和抗疲劳性能改善效果的优势互补。在1.0%~1.5%PPA掺量和18%~24%TB胶粉掺量范围内TB与PPA复合改性沥青可替代4.5%SBS改性沥青,且PPA与TB胶粉复合改性沥青混合料具有更优的路用性能和抗疲劳性能。1.0%PPA+18%TB、1.25%PPA+22%TB、1.5%PPA+26%TB三种复合改性沥青混合料疲劳寿命比4.5%SBS改性沥青混合料高40%~110%,室温放置4个月后的自愈合性能为SBS改性沥青混合料的2.5倍,掺TB胶粉改性沥青显著提高了PPA改性沥青混合料的抗疲劳耐久性和自愈合性能。推荐PPA与TB胶粉复合改性沥青中,适宜的PPA掺量为1.0%~1.5%,TB胶粉合理掺量为20%~24%。
[Abstract]:Based on the penetration evaluation system and PG grading system, the performance of Terminal Blending compound asphalt was studied. The optimum dosage range of PPA and TB powder was optimized by rutting, bending at low temperature and immersion Marshall. The pavement performance, fatigue resistance and self-healing performance of PPA and TB compound modified asphalt mixture were studied by freeze-thaw splitting test and four-point loading fatigue test. It is compared with 4.5 SBS modified asphalt mixture. The results show that the low temperature performance and fatigue resistance of modified asphalt with TB powder are good, but its high temperature performance is poor. After blending TB rubber powder with PPA, the advantages of improving the high and low temperature performance and fatigue resistance of asphalt mixture can be realized. TB and PPA composite modified asphalt can replace 4.5 SBS modified asphalt in powder range. And the compound modified asphalt mixture of PPA and TB powder has better road performance and fatigue resistance. 1.0% PPA18TBX 1.25PPA22TB. The fatigue life of 1.5 PPA 26TB composite modified asphalt mixture is 40% higher than that of 4.5 SBS modified asphalt mixture. The self-healing performance of SBS modified asphalt mixture after 4 months of storage at room temperature is 2. 5 times as much as that of SBS modified asphalt mixture. The anti-fatigue durability and self-healing performance of PPA modified asphalt mixture were improved significantly by adding TB rubber powder. It is recommended that PPA and TB rubber powder compound modified asphalt. The appropriate dosage of PPA is 1.0% and 1.5% TB powder.
【作者单位】：内蒙古赤峰市安通路桥有限责任公司;
【分类号】：U414
【正文快照】： 0引言为了适应高温、重载、超载、渠化交通道路沥青路面的高低温性能、耐久性能和极端气候(荷载)条件下的耐候性,高速公路上中沥青面层采用改性沥青的做法也越来越普遍,越来越多的改性沥青结合料用于道路建设。以多聚磷酸(PPA)和反应型三元共聚物(RET)为代表的化学改性剂能够

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