TB与SBS复合改性沥青及其混合料性能研究

发布时间：2018-01-02 01:20

本文关键词：TB与SBS复合改性沥青及其混合料性能研究　出处：《公路工程》2016年05期 　论文类型：期刊论文

【摘要】：评价了SBS、Terminal Blend胶粉掺量对Terminal Blend/SBS复合改性沥青性能的改性效果和改性机理,研究了SBS与TB复合改性沥青混合料的路用性能、抗疲劳性能和长期使用性能。试验结果表明:SBS与TB复合改性剂对于石油沥青的改性效果不是简单的叠加,而是非线性的增强作用。增大SBS掺量能有效提高复合改性沥青的软化点、延度和PG高温分级,降低其针入度,增大TB胶粉有效改善了复合改性沥青的低温性能,SBS与TB复合改性沥青兼顾了TB改性沥青混合料优良的低温性能、抗疲劳性能以及SBS改性沥青混合料优良的高低温、水稳定性和抗疲劳性能。推荐用于TB与SBS复合改性沥青中适宜的SBS掺量为2%~3%,TB胶粉掺量为15%~20%。3%SBS+15%TB、2.5%SBS+18%TB、2.0%SBS+20%TB 3种复配方案的低温抗裂性能是SBS改性沥青混合料的1.58、1.63、1.61倍,高温性能可与4.5%SBS相媲美。工程实践表明,SBS/TB复合改性沥青混凝土可比4.5%SBS改性沥青混凝土节省造价约13%,2.5%SBS+18%TB、3%SBS+15%TB 2种复配方案抗疲劳性能和高低温性能均优于SBS改性沥青混合料,Terminal Blend/SBS复合改性沥青混合料推广、应用前景广阔。
[Abstract]:The modification effect and modification mechanism of Terminal Blend/SBS compound modified asphalt with the content of SBS terminal Blend rubber powder were evaluated. The road performance of SBS and TB composite modified asphalt mixture was studied. The experimental results show that the modification effect of the composite modifier of 1: SBS and TB on petroleum asphalt is not a simple superposition. Increasing the content of SBS can effectively improve the softening point, ductility and PG grade of modified asphalt, and reduce the penetration. Increasing TB rubber powder can effectively improve the low temperature performance of composite modified asphalt. SBS and TB composite modified asphalt take into account the excellent low temperature performance of TB modified asphalt mixture. Fatigue resistance and excellent high and low temperature, water stability and fatigue resistance of SBS modified asphalt mixture. It is recommended that the suitable content of SBS in TB / SBS composite modified asphalt is 2% or 3%. The amount of TB rubber powder is 15% 20%. 3% SBS 15%, 2. 5% TB15 and 2. 5 SBS 18 TB. The low temperature crack resistance of the mixture of 2.0SBS20TB is 1.61 times higher than that of SBS modified asphalt mixture. The high temperature performance is comparable to that of 4.5 SBS. Engineering practice shows that SBS / TB composite modified asphalt concrete can save about 13% cost compared with 4.5 SBS modified asphalt concrete. The fatigue resistance and high and low temperature performance of the two kinds of composite schemes are better than that of SBS modified asphalt mixture. The application prospect of Terminal Blend/SBS compound modified asphalt mixture is wide.
【作者单位】：根河公路养护管理处;
【分类号】：U414
【正文快照】： ance;modification mechanism0引言目前国际公认的降橡胶沥青应用于沥青路面中具有优良低温性能、自愈合性能、疲劳韧性、降噪、除冰和再生环保性能优势,能减少废旧轮胎造成的黑色污染、加大资源的循环使用、改善路面受力状态,抗老化,延长使用寿命,降噪3-5 d B,减振,行车舒适,

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