摘要
以介孔硅藻为改性剂改性制备了不同掺量的介孔硅改性沥青,通过IR、SEM、OM对其改性过程及其改性机制进行了微观分析,并根据IR、SEM以及沥青四组分的分析结果绘制出改性过程模型图,利用TG及针入度、软化点、延度等测试方法对不同掺量介孔硅改性沥青与原质沥青的相关性能进行了比较。结果表明:介孔硅改性沥青的过程没有明显的化学变化,主要为介孔硅物理吸附沥青的过程,介孔硅由于多孔、比表面积大的特性更易吸收沥青中流动性强、分子量小的溶剂组分(饱和组分及芳香组分)到其内部孔隙和周围,它们在温度降低时冷凝硬化与介孔硅相互固定形成均匀稳定的整体,这是介孔硅改性沥青高温性能提高的主要原因;介孔硅藻的掺量与改性沥青性能并不呈正相关,改性沥青的温度敏感性和低温性能会随着掺量的增加而变差,介孔硅质量分数为13%时,介孔硅改性沥青的综合性能相对较好。
Diatomite was used as modifier to prepare diatomite-modified asphalt at different contents.The modification process and mechanism of diatomite modified asphalt were characterized by IR,SEM,OM,and a model diagram of the modification process was inferred based on the analytical results of IR,SEM and four components of asphalt.Furthermore,related performance of the diatomite-modified asphalt was examined with TG,penetration,softening point,ductility test,respectively.The results show that diatomite modified asphalt exhibits no obvious chemical change,it is showed that diatomite absorbed asphalt physically,solvent components of relatively strong liquidity and smaller molecular weight in asphalt are easily absorbed into or around diatomite for its porosity and large specific surface,they can be congealed and hardened to form a stable and homogeneous lump with diatomite when temperature decrease.This is the main reason for improvement of high temperature performance of diatomite modified asphalt.The content of diatomite is not positively related to the performance of modified asphalt.The temperature sensitivity and low temperature performance of the modified asphalt will be worse with increase content of the diatomite,the global performance of diatomite-modified asphalt is relatively good when the content is 13%.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2017年第9期2047-2052,共6页
Acta Materiae Compositae Sinica
基金
广西科技攻关项目(14124004-4-16)
广西硕士研究生创新项目(YCSZ2015162)
关键词
介孔硅藻
沥青
改性机制
掺量
性能
diatomite
asphalt
modification mechanism
content
performance
