生活废旧塑料改性沥青的性能研究  

Study on Performance of Waste Plastic Modified Asphalt

作　　者：杨锡武[1] 刘克[1] 冯梅[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074

出　　处：《建筑材料学报》2015年第5期905-911,共7页Journal of Building Materials

基　　金：重庆市交通委员会科技项目(2008-15);重庆高校优秀成果转化项目(kjzh11205)

摘　　要：采用Ⅰ型废旧塑料改性剂(造粒工艺制作)和Ⅱ型废旧塑料改性剂(加热和加稳定剂处理工艺制作)分别制备了Ⅰ型和Ⅱ型废旧塑料改性沥青.对比分析了Ⅰ,Ⅱ型废旧塑料改性沥青的存储稳定性、软化点及低温性能;对比分析了Ⅰ,Ⅱ型废旧塑料改性沥青混合料的马歇尔稳定度及高温稳定性;研究了Ⅰ,Ⅱ型废旧塑料改性剂的分子结构差异,探讨了废旧塑料改性剂改性沥青的机理;进行了Ⅱ-B(聚丙烯类)废旧塑料改性沥青的试验路应用.结果表明:Ⅱ型废旧塑料改性沥青的软化点可达60℃以上,试样上、下部软化点差值小于2.5℃;Ⅱ型废旧塑料改性沥青混合料的马歇尔稳定度总体上大于Ⅰ型废旧塑料改性沥青混合料;与Ⅰ型废旧塑料改性剂相比,Ⅱ型废旧塑料改性剂分子链长度缩短,支链增多,双键结构增加,且分子中含有—OH基团;Ⅰ,Ⅱ型废旧塑料改性沥青中没有新物质结构生成,废旧塑料改性沥青属于物理改性;在试验路应用中,Ⅱ-B废旧塑料改性沥青施工工艺与SBS改性沥青相同,混合料路面使用状况良好,可用于路面表面层或下面层.Type I and type If waste plastic modified asphalts were prepared by type I waste plastic modi- fier（made by granulating process） and type Ⅱ waste plastic modifier（made by heating and adding stabilizer process） respectively. The storage stability, softening point and low temperature performance of type I and type Ⅱ waste plastic modified asphalts were tested. The Marshall stability and high temperature sta- bility of type I and type Ⅱ waste plastic modified asphalt mixture were tested. The molecular structure difference between type I and type Ⅱ waste plastic modifier were studied,the mechanism for waste plastic modifier modifying asphalt was investigated. The results show that the softening point of type Ⅱ waste plastic modified asphalt can be up to 60 ℃ and the difference of softening point between the upper and low- er layer of sample is less than 2.5℃. The Marshall stability of typeⅡ waste plastic modified asphalt mix- ture is better than that of type I waste plastic modified asphalt mixture in general. Compared with type T waste plastics modifier, type Ⅱ waste plastics modifier has shorter molecular chain, more side chain and more double bond, and has --OH group in the molecule. There are no new substances in two types of waste plastics modified asphalt. It is proved that the construction process of Ⅱ-B waste plastics modified asphalt is similar with SBS modified asphalt and the pavement situation is favorable at present. The II-B waste plastic modified asphalt mixture can be used as the surface layer and underlying layer of pavement.

关 键 词：废旧塑料 改性沥青 离析 高温稳定性 红外光谱 机理 

分 类 号：U414[交通运输工程—道路与铁道工程]