橡胶沥青的改性机理  

Rubber asphalt modification mechanism

作　　者：王笑风[1,2] 曹荣吉[3] 

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064 [2]河南省交通规划勘察设计院有限责任公司,河南郑州450052 [3]江苏省交通科学研究院,江苏南京211112

出　　处：《长安大学学报（自然科学版）》2011年第2期6-11,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：河南省交通科技重点项目(2009D102)

摘　　要：针对橡胶沥青改性机理的复杂性,采用扫描电镜、红外光谱、差热分析、微观结构分析、组分分析及胶粉化学分析等方法,研究了橡胶沥青混溶体系的改性机理。结果表明:胶粉溶胀后互相粘连,形成网络结构,基质沥青由匀质体变成了胶粉和沥青构成的两相连续共混结构体系;胶粉与基质沥青间以物理溶胀为主,但存在弱化学反应,且随时间延长,化学反应越明显;溶胀胶粉形成阻尼作用,提高了橡胶沥青粘度;沥青的改性源于溶胀胶粉构成的网络结构和胶粉脱硫降解对沥青组分的改善作用;天然橡胶对沥青的改性效果优于合成橡胶。In light of the complexity of rubber asphalt modification mechanism,such means as scanning electron microscopy,infrared spectroscopy,differential thermal analysis,microscopic structure analysis,component analysis were adopted to study the components of the asphalt before and after modifying,and chemical analysis of rubber powder are adopted to study the modification mechanism of asphalt rubber blending system.The results indicate that the swollen rubber powder is mutually-adhered to form a network structure,and the matrix asphalt changes from homogeneous body into a two-phase continuous blending structure system constituted by rubber powder and asphalt;physical swelling dominates the system,accompanied by a little chemical reaction and with the prolongation of time,the chemical reaction becomes more obvious;the swollen rubber powder forms damping effects to improve the viscosity of rubber asphalt.The modification of asphalt comes from two aspects： firstly,the network structure formed by swollen rubber powder;secondly,the modification of the asphalt composition resulting from rubber powder desulphurization degradation.The natural rubber has better performance in modifying asphalt than synthetic rubber.4 tabs,9 figs,12 refs.

关 键 词：道路工程 沥青 橡胶粉 改性机理 物理共混 化学反应 

分 类 号：U416.217[交通运输工程—道路与铁道工程]