钢桥面铺装用环氧沥青混合料低温断裂性能  

Fracture Characteristic of Epoxy Resin Asphalt Mixes for Steel-Deck Pavement at Low Temperatures

作　　者：闵召辉[1] 孔冬雷[1] 黄卫[1] 

机构地区：[1]东南大学智能运输系统研究中心,江苏南京210096

出　　处：《建筑材料学报》2012年第1期91-95,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50878053)

摘　　要：测试了钢桥面铺装用环氧沥青结合料-30～20℃的动态热机械性能(DMA),并用扫描电镜(SEM)观察了拉伸试件的断口;采用单边切口小梁试件进行了-20,-10,0,10℃的混合料断裂性能试验.结果表明:交联度为58.4%,67.3%,71.4%,75.3%的4种环氧沥青混合料断裂韧度随着温度的提高而降低,断裂能随着温度提高而增大;高交联度混合料的断裂韧度和断裂能变化幅度小,低交联度混合料的断裂韧度和断裂能变化幅度大.4种交联度环氧沥青混合料的断裂韧度、断裂能与结合料动态模量或交联度、温度具有较好相关性.断口扫描电镜照片表明,低交联度的环氧沥青交联网络撕裂后会形成凹凸不平的表面,有利于受力时吸收更多的能量,从而使体系具有更大的抗开裂能力.Fracture tests were performed for epoxy resin asphalt mixes for steel-deck pavement using single edge notch beam specimen at-20,-10,0 and 10 ℃. Dynamic mechanical analysis（DMA） was implemen- ted for epoxy resin asphalt at temperature range from -30 to 20 ℃, and GEM photos of section of tensile specimens were used to analyse micro-structure of this material. Results show that fracture toughness of the epoxy resin asphalt mixes with crosslink degrees of 58.4%, 67.3%, 71.4% and 75.3% is reduced with increasing temperature, while fracture energy of that increases. Fracture toughness and fracture energy of four different crosslink degree epoxy resin asphalt mixes correlate with dynamic modulus of binder, or crosslink degree and temperature. Relationships are found between fracture parameters of mixes and dy- namic modulus of binder, or crosslink degree and temperature. SEM photos show that the section of low crosslink degree epoxy resin asphalt is irregular, which could absorb more fracture energy.

关 键 词：环氧沥青 混合料 断裂 交联度 

分 类 号：U414.01[交通运输工程—道路与铁道工程]