| 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25℃；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. |
| 关键词: 废旧塑料 改性沥青 离析 高温稳定性 红外光谱 机理 |
| DOI：103969/j.issn1007 9629201505033 |
| 分类号: |
| 基金项目: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） |
|
| Study on Performance of Waste Plastic Modified Asphalt |
|
YANG Xiwu, LIU Ke, FENG Mei
|
|
School of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing 400074, China
|
| Abstract: |
| Type Ⅰ and type Ⅱ waste plastic modified asphalts were prepared by type Ⅰ waste plastic modifier（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 stability 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 lower layer of sample is less than 25℃. The Marshall stability of type Ⅱ waste plastic modified asphalt mixture is better than that of type Ⅰ waste plastic modified asphalt mixture in general. Compared with type Ⅰ 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. |
| Key words: waste plastic modified asphalt segregation high temperature stability infrared spectroscopy mechanism |
